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IDTSTAC9766XXTAEC1XR

IDTSTAC9766XXTAEC1XR

  • 厂商:

    RENESAS(瑞萨)

  • 封装:

    48-LQFP

  • 描述:

    IC CODEC AC'97 2CH 2.3 48-TQFP

  • 数据手册
  • 价格&库存
IDTSTAC9766XXTAEC1XR 数据手册
DATASHEET TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING STAC9766/9767 FEATURES RELATED MATERIALS • This datasheet is for Rev. CC1 Parts and Beyond • Data Sheet • High Performance Σ∆ Technology • Reference Designs • AC’97 Rev 2.3 Complaint • 20-bit Full Duplex Stereo ADC & DACs • Independent Sample Rates for ADC & DACs • 5-Wire AC-Link Protocol Compliance • 20-bit SPDIF Output • Full Stereo Microphone Pre-Amp • Internal Jack Sensing on Headphone & Line_Out • Internal Microphone Input Sensing • Digital PC Beep Option • Extended AC’97 2.3 Paging Registers • Digital-ready Status • General Purpose I/O • Crystal Elimination Circuit • Headphone Drive Capability (50 mW) • 0dB, 10dB, 20dB and 30dB Microphone Boost Capability • +3.3 V (STAC9767) and +5 V (STAC9766) Analog Power Supply Options • Pin Compatible with STAC9700/21/56 • 100% Compatible with STAC9750/52 • IDT Surround (SS3D) Stereo Enhancement • Energy Saving Dynamic Power Modes • Multi-CODEC Option (Intel AC'97 rev 2.3) • Six Analog Line-level Inputs • 103dB SNR LINE-LINE DESCRIPTION IDT's STAC9766/9767 (Revision CC1 and beyond) are general purpose 20-bit, full duplex, audio CODECs conforming to the analog component specification of AC'97 (Audio CODEC 97 Component Specification Rev. 2.3). The STAC9766/9767 incorporates IDT's proprietary Σ∆ technology The AC’97 CODEC is designed to achieve a DAC SNR in excess of 103dB. The DACs, ADCs and mixer are integrated with analog I/ Os, which include four analog line-level stereo inputs, two analog line-level mono inputs, two stereo outputs, and one mono output channel. The STAC9766/9767 includes digital input/output capability for support of modern PC systems with an output that supports the SPDIF format. The STAC9766/9767 is a standard 2-channel stereo CODEC. With IDT’s headphone drive capability, headphones can be driven with without an external amplifier. The STAC9766/9767 may be used as a secondary CODEC, with the STAC9700/21/56/08/84/50/52 as the primary, in a multiple CODEC configuration conforming to the AC'97 Rev. 2.3 specification. This configuration can provide the true six-channel, AC-3 playback required for DVD applications. The STAC9766/9767 communicates via the five-wire AC-Link to any digital component of AC'97, providing flexibility in the audio system design. Packaged in an AC'97 compliant 48-pin TQFP, the STAC9766/9767 can be placed on a motherboard, daughter boards, PCI, AMR, CNR, MDC or ACR cards. KEY SPECIFICATIONS • Analog LINE_OUT SNR: 103 dB • Digital DAC SNR: 95 dB • Digital ADC SNR: 85 dB • Full-scale Total Harmonic Distortion: 0.002% • Crosstalk Between Input Channels: -70 dB • Spurious Tone Rejection: 100 dB The STAC9766/9767 provides variable sample rate Digital-to-Analog (DA) and Analog-to-Digital (AD) conversion, mixing and analog processing. Supported audio sample rates include 48KHz, 44.1KHz, 32KHz, 22.05KHz, 16KHz, 11.025KHz, and 8 KHz; additional rates are supported in the STAC9766/9767 soft audio drivers. All ADCs and DACs operate at 20-bit resolution. The STAC9766/9767 includes full Stereo Microphone IDT™ 1 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING STAC9766/9767 V 7.4 12/06 STAC9766/9767 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING PC AUDIO Table of Contents 1. PRODUCT BRIEF ...................................................................................................................... 6 1.1. Features (Revision CC1 and beyond) ............................................................................................... 6 1.2. Description ........................................................................................................................................ 6 1.3. STAC9766/9767 Block Diagram ........................................................................................................ 8 1.4. Key Specifications ............................................................................................................................. 8 1.5. Related Materials .............................................................................................................................. 8 1.6. Additional Support ............................................................................................................................. 8 2. CHARACTERISTICS AND SPECIFICATIONS .........................................................................9 2.1. Electrical Specifications ..................................................................................................................... 9 2.2. AC Timing Characteristics ............................................................................................................... 13 3. TYPICAL CONNECTION DIAGRAM .......................................................................................17 3.1. Split Independent Power Supply Operation .................................................................................... 18 4. CONTROLLER, CODEC AND AC-LINK .................................................................................20 4.1. AC-link Physical interface ................................................................................................................ 20 4.2. Controller to Single CODEC ............................................................................................................ 20 4.3. Controller to Multiple CODECs ........................................................................................................ 22 4.4. Clocking for Multiple CODEC Implementations ............................................................................... 23 4.5. AC-link Power Management ............................................................................................................ 24 5. AC-LINK DIGITAL INTERFACE ..............................................................................................27 5.1. Overview ......................................................................................................................................... 27 5.2. AC-link Serial Interface Protocol ...................................................................................................... 28 5.3. AC-link Output Frame (SDATA_OUT) ............................................................................................. 31 5.4. AC-link Input Frame (SDATA_IN) .................................................................................................... 34 5.5. AC-link Interoperability Requirements and Recommendations ....................................................... 38 5.6. Slot Assignments for Audio ............................................................................................................. 39 6. STAC9766/9767 MIXER ..........................................................................................................41 6.1. Mixer Description ............................................................................................................................. 41 6.2. Mixer Functional Diagrams .............................................................................................................. 42 6.3. Mixer Analog Input ......................................................................................................................... 43 6.4. Mixer Analog Output ....................................................................................................................... 43 7. SPDIF AND PC BEEP .............................................................................................................44 7.1. SPDIF Digital Mux ...........................................................................................................................44 7.2. PC Beep Implementation ................................................................................................................ 44 8. PROGRAMMING REGISTERS ...............................................................................................46 8.1. Register Descriptions ...................................................................................................................... 47 8.2. General Purpose Input & Outputs ................................................................................................... 65 8.3. Extended CODEC Registers Page Structure Definition .................................................................. 68 8.4. STAC9766/9767 Paging Registers ................................................................................................. 69 8.5. Vendor ID1 and ID2 (Index 7Ch and 7Eh) ...................................................................................... 79 9. LOW POWER MODES ...........................................................................................................81 10. MULTIPLE CODEC SUPPORT ............................................................................................83 10.1. Primary/Secondary CODEC Selection .......................................................................................... 83 10.2. Secondary CODEC Register Access Definitions .......................................................................... 84 11. TESTABILITY ........................................................................................................................85 11.1. ATE Test Mode ............................................................................................................................. 85 12. ORDERING INFORMATION ..................................................................................................86 12.1. STAC9766/9767 Family Options and Part Order Numbers ...........................................................86 13. PIN DESCRIPTION ................................................................................................................87 13.1. Digital I/O ...................................................................................................................................... 88 13.2. Filter/References .......................................................................................................................... 88 13.3. Analog I/O .................................................................................................................................... 89 13.4. Power and Ground Signals .......................................................................................................... 90 IDT™ 2 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING STAC9766/9767 V 7.4 12/06 STAC9766/9767 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING PC AUDIO 14. PACKAGE DRAWING ...........................................................................................................91 14.1. 48-Pin LQFP .................................................................................................................................. 91 15. SOLDER REFLOW PROFILE ...............................................................................................92 15.1. Standard Reflow Profile Data ........................................................................................................ 92 15.2. Pb Free Process - Package Classification Reflow Temperatures ................................................. 93 16. APPENDIX A: PROGRAMMING REGISTERS .....................................................................94 17. REVISION HISTORY .............................................................................................................96 IDT™ 3 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING STAC9766/9767 V 7.4 12/06 STAC9766/9767 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING PC AUDIO List of Figures Figure 1. Block Diagram .................................................................................................................................. 8 Figure 2. Cold Reset Timing ......................................................................................................................... 13 Figure 3. Warm Reset Timing ........................................................................................................................13 Figure 4. Clocks Timing ................................................................................................................................ 14 Figure 5. Data Setup and Hold Timing ......................................................................................................... 15 Figure 6. Signal Rise and Fall Times Timing ................................................................................................ 15 Figure 7. AC-Link Low Power Mode Timing .................................................................................................. 16 Figure 8. ATE Test Mode Timing ..................................................................................................................16 Figure 9. Typical Connection Diagram .......................................................................................................... 17 Figure 10. Split Independent Power Supply Operation ................................................................................. 19 Figure 11. AC-Link to its Companion Controller ........................................................................................... 20 Figure 12. CODEC Clock Source Detection ................................................................................................. 21 Figure 13. STAC9766/9767 Powerdown Timing .......................................................................................... 24 Figure 14. Bi-directional AC-link Frame with Slot Assignments ....................................................................27 Figure 15. AC-Link Audio Output Frame ...................................................................................................... 31 Figure 16. Start of an Audio Output Frame ................................................................................................... 31 Figure 17. STAC9766/9767 Audio Input Frame ........................................................................................... 34 Figure 18. Start of an Audio Input Frame ..................................................................................................... 35 Figure 19. Bi-directional AC-link Frame with Slot assignments ....................................................................39 Figure 20. STAC9766 2-Channel Mixer Functional Diagram .......................................................................42 Figure 21. STAC9767 2-Channel Mixer Functional Diagram .......................................................................42 Figure 22. Example of STAC9766/9767 Powerdown/Powerup Flow ...........................................................81 Figure 23. Powerdown/Powerup Flow With Analog Still Alive .......................................................................82 Figure 24. Pin Description Drawing ............................................................................................................... 87 Figure 25. 48-Pin LQFP Package Outline and Package Dimensions ...........................................................91 Figure 26. Solder Reflow Profile ................................................................................................................... 92 IDT™ 4 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING STAC9766/9767 V 7.4 12/06 STAC9766/9767 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING PC AUDIO List of Tables Table 1. Clock Mode Configuration ............................................................................................................... 14 Table 2. Common Clocks and Sources ......................................................................................................... 15 Table 3. Recommended CODEC ID Strapping ............................................................................................. 23 Table 4. AC-link Output Slots (Transmitted from the Controller) ................................................................... 27 Table 5. The AC-link input slots (transmitted from the CODEC) ................................................................... 28 Table 6. VRA Behavior .................................................................................................................................. 29 Table 7. Output Slot 0 Bit Definitions ............................................................................................................. 32 Table 8. Command Address Port Bit Assignments ........................................................................................ 33 Table 9. Status Address Port Bit Assignments .............................................................................................. 36 Table 10. Status Data Port Bit Assignments .................................................................................................. 36 Table 11. Primary CODEC Addressing: Slot 0 Tag Bits ................................................................................ 38 Table 12. Secondary CODEC Addressing: Slot 0 tag bits ............................................................................. 38 Table 13. AC-link Input Slots To CODEC ...................................................................................................... 39 Table 14. AC-link Input Slots From CODEC .................................................................................................. 39 Table 15. AC-link Output Slots Dedicated To Audio ...................................................................................... 40 Table 16. AC-link Input Slots Dedicated To Audio ......................................................................................... 40 Table 17. Audio Interrupt Slot Definitions ...................................................................................................... 40 Table 18. Digital PC Beep Examples ............................................................................................................. 45 Table 19. Programming Registers ................................................................................................................. 46 Table 20. Extended Audio ID Register Functions .......................................................................................... 60 Table 21. AMAP Compliant ...........................................................................................................................62 Table 22. Hardware Supported Sample Rates .............................................................................................. 63 Table 23. Supported Jack and Mic Sense Functions .................................................................................... 72 Table 24. Reg 68h Default Values ................................................................................................................. 73 Table 25. Gain or Attenuation Examples ....................................................................................................... 73 Table 26. Register 68h/Page 01h Bit Overview ............................................................................................. 74 Table 27. Sensed Bits (Outputs) ................................................................................................................... 75 Table 28. Sensed Bits (Inputs) ...................................................................................................................... 76 Table 29. Low Power Modes ......................................................................................................................... 81 Table 30. CODEC ID Selection .....................................................................................................................83 Table 31. Secondary CODEC Register Access Slot 0 Bit Definitions ...........................................................84 Table 32. Test Mode Activation .....................................................................................................................85 Table 33. ATE Test Mode Operation ............................................................................................................. 85 Table 34. STAC9766/9767 Ordering Information .......................................................................................... 86 Table 35. Digital Connection Signals ............................................................................................................. 88 Table 36. Filtering and Voltage References .................................................................................................. 88 Table 37. Analog Connection Signals ........................................................................................................... 89 Table 38. Power and Ground Signals ............................................................................................................ 90 IDT™ 5 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING STAC9766/9767 V 7.4 12/06 STAC9766/9767 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING PC AUDIO 1. PRODUCT BRIEF 1.1. 1.2. Features (Revision CC1 and beyond) • High Performance Σ∆ Technology • AC’97 Rev 2.3 Complaint • 20-bit Full Duplex Stereo ADCs, DACs • Independent Sample Rates for ADCs & DACs • 5-Wire AC-Link Protocol Compliance • 20-bit SPDIF Output • Full Stereo Microphone Pre-Amp • Internal Jack Sensing on Headphone and Line_Out • Internal Microphone Input Sensing • Digital PC Beep Option • Extended AC’97 2.3 Paging Registers • Adjustable VREF Amplifier • Digital-ready Status • General Purpose I/Os • Crystal Elimination Circuit • Headphone Drive Capability (50 mW) • 0dB, 10dB, 20dB, and 30dB Stereo or Mono M icrophone Boost Capability • +3.3V (STAC9767) and +5V (STAC9766) Analog Power Supply Options • Pin Compatible with the STAC9700, STAC9721, STAC9756 • 100% Pin Compatible with STAC9750 and STAC9752 • IDT Surround (SS3D) Stereo Enhancement • Energy Saving Dynamic Power Modes • Multi-CODEC option (Intel AC'97 rev 2.3) • Six Analog Line-level Inputs • 103dB SNR LINE-LINE Description IDT's STAC9766/9767 (Revision CC1 and beyond) are general purpose 20-bit, full duplex, audio CODECs conforming to the analog component specification of AC'97 (Audio CODEC 97 Component Specification Rev. 2.3). The STAC9766/9767 incorporates IDT's proprietary Σ∆ technology to achieve a DAC SNR in excess of 103dB. The DACs, ADCs and mixer are integrated with analog I/Os, which include four analog line-level stereo inputs, two analog line-level mono inputs, two stereo outputs, and one mono output channel. The STAC9766/9767 includes digital output capability for support of modern PC systems with an output that supports the SPDIF format. The STAC9766/9767 is a standard 2-channel stereo CODEC. With IDT’s headphone drive capability, headphones can be driven without an external amplifier. The STAC9766/9767 may be used as a secondary CODEC, with the STAC9700/21/44/56/08/84/50/66 as the primary, in a multiple CODEC configuration conforming to the AC'97 Rev. 2.3 specification. This configuration can provide the true six-channel, AC-3 playback required for DVD applications. The STAC9766/9767 communicates via the five-wire IDT™ 6 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING STAC9766/9767 V 7.4 12/06 STAC9766/9767 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING PC AUDIO AC-Link to any digital component of AC'97 providing flexibility in the audio system design. Packaged in an AC'97 compliant 48-pin TQFP, the STAC9766/9767 can be placed on a motherboard, daughter boards, PCI, AMR, CNR, MDC or ACR cards. The STAC9766/9767 block diagram is illustrated in Figure 1. It provides variable sample rate Digital-to-Analog (DA) and Analog-to-Digital (AD) conversion, mixing, and analog processing. Supported audio sample rates include 48KHz, 44.1KHz, 32 KHz, 22.05KHz, 16KHz, 11.025KHz, and 8KHz; additional rates are supported in the STAC9766/9767 soft audio drivers. All ADCs and DACs operate at 20-bit resolution. Two 20-bit DACs convert the digital stereo PCM-out content to audio. The MIXER block combines the PCM_OUT with any analog sources to drive the LINE_OUT and HP_OUT outputs. The MONO_OUT delivers either microphone only, or a mono mix of sources from the MIXER. The stereo variable sample rate 20-bit ADCs provide record capability for any mix of mono or stereo sources, and deliver a digital stereo PCM-in signal back to the AC-Link. The microphone input and mono mix input can be recorded simultaneously, thus allowing for an all digital output in support of the digital ready initiative. For a digital ready record path, the microphone is connected to the left channel ADC while the mono output of the stereo mixer is connected to right channel ADC. The STAC9766/9767 includes full Stereo Microphone Pre-Amp support and can be used with the 10dB, 20dB and 30dB Microphone Boost options. This integration allows for additional cost savings and options. The STAC9766/9767 includes jack sensing on the Headphone and Line_Out. The STAC9766/9767 jack sense can detect the presence of devices on the Headphone and Line Outputs and on both Mic inputs. With proprietary IDT current- and impedance-sensing techniques, the impedance load on the Headphone and Line Outputs can also be detected. The GPIOs on the STAC9766/9767 remain available for advanced configurations. The STAC9766/9767 implementation of jack sense uses the Extended Paging Registers defined by the AC'97 2.3 Specification. This allows for additional registry space to hold the identification information about the CODEC, the jack sensing details and results, and the external surroundings of the CODEC. The information within the Extended Paging Registers will allow for the automatic configuration of the audio subsystem without end-user intervention. For example, the BIOS can populate the Extended Paging Registers with valuable information for both the audio driver and the operating system such as gain and attenuation stages, input population and input phase. With this input information, the IDT driver will automatically provide to the Volume Control Panel only the volume sliders that are implemented in the system, thus improving the end-user's experience with the PC. The information in the Extended Paging Registers will also allow for automatic configuration of microphone inputs, the ability to switch between SPDIF and analog outputs, the routing of the master volume slider to the proper physical output, and SoftEQ configurations. The fully parametric IDT SoftEQ can be initiated upon jack insertion and sensed impedance levels. The STAC9766/9767 also offers two styles of PC BEEP, Analog and Digital. The digital PC BEEP is a new feature added to the AC’97 Specification Rev 2.3. The STAC9766/9767 is designed primarily to support stereo (2-speaker) audio. True AC-3 playback can be achieved for 6-speaker applications by taking advantage of the multi-CODEC option available in the STAC9766/9767 to support multiple CODECs in an AC'97 architecture. Additionally, the IDT™ 7 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING STAC9766/9767 V 7.4 12/06 STAC9766/9767 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING PC AUDIO STAC9766/9767 provides for a stereo enhancement feature, IDT Surround 3D (SS3D). SS3D provides the listener with several options for improved speaker separation beyond the normal 2- or 4-speaker arrangements. The STAC9766/9767 can be SoundBlaster ® and Windows Sound System® compatible when used with IDT’s WDM driver for Windows 98/2K/ME/XP or with Intel/Microsoft driver included with Windows 2K/ME/XP. SoundBlaster is a registered trademark of Creative Labs. Windows is a registered trademark of Microsoft Corporation. 1.3. STAC9766/9767 Block Diagram Figure 1. Block Diagram 4 stereo sources Power Management 2 mono sources Stereo Mono PCM out DACs AC-link SYNC BIT_CLK SDATA_OUT SDATA_IN RESET# Multi-Codec CID0 CID1 DAC Digital Interface DAC Registers 64x16 bits ADC HP_OUT MIXER Analog mixing and Gain Control LINE_OUT MONO_OUT ADC Stereo or Mono Mic Boost 0,10,20 or 30 dB PCM in ADCs GPIO1 EAPD GPIO0 Variable Sample Rate 20-Bit DACs and 20-Bit ADCs 1.4. SPDIF Analog LINE_OUT SNR: 103 dB Digital DAC SNR: 95 dB Digital ADC SNR: 85 dB Full-scale Total Harmonic Distortion: 0.002% Crosstalk between Input Channels: -70 dB Spurious Tone Rejection: 100 dB Related Materials • • • 1.6. MIC2 (R) Key Specifications • • • • • • 1.5. M MIC1 (L) U X Product Brief Reference Designs for MB, AMR, CNR, and ACR applications Audio Precision Performance Plots Additional Support Additional product and company information can be obtained by going to the IDT web site at: www.IDT.com IDT™ 8 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING STAC9766/9767 V 7.4 12/06 STAC9766/9767 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING PC AUDIO 2. CHARACTERISTICS AND SPECIFICATIONS 2.1. Electrical Specifications 2.1.1. Absolute Maximum Ratings Stresses above the ratings listed below can cause permanent damage to the STAC9766/9767. These ratings, which are standard values for IDT commercially rated parts, are stress ratings only. Functional operation of the device at these or any other conditions above those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods can affect product reliability. Electrical parameters are guaranteed only over the recommended operating temperature range. Item Pin Maximum Rating Analog maximum supply voltage AVdd 6 Volts Digital maximum supply voltage DVdd 5.5 Volts VREFOUT output current 5 mA Voltage on any pin relative to ground Vss - 0.3 V to Vdd + 0.3 V Operating temperature 0o C to +70o C Storage temperature -55 o C to +125 o C Soldering temperature 260 o C for 10 seconds * Soldering temperature information for all available packages begins on page 92. 2.1.2. Recommended Operation Conditions Parameter Power Supply Voltage Min. Typ. Max. Units Digital - 3.3 V 3.135 3.3 3.465 V Analog - 3.3 V 3.135 3.3 3.465 V Analog - 5 V 4.75 5 5.25 V +70 °C +90 °C Ambient Operating Temperature Case Temperature 0 Tcase (48-LQFP) ESD: The STAC9766/9767 is an ESD (electrostatic discharge) sensitive device. The human body and test equipment can accumulate and discharge electrostatic charges up to 4000 Volts without detection. Even though the STAC9766/9767 implements internal ESD protection circuitry, proper ESD precautions should be followed to avoid damaging the functionality or performance. IDT™ 9 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING STAC9766/9767 V 7.4 12/06 STAC9766/9767 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING 2.1.3. Power Consumption Parameter Digital Supply Current + 3.3V Digital Analog Supply Current + 5V Analog + 3.3V Analog Power Down Status PR0 Supply Current PR1 Supply Current PR2 Supply Current PR3 Supply Current PR4 Supply Current PR5 Supply Current PR6 Supply Current 2.1.4. PC AUDIO Min Typ Max Unit - 35 - mA - 80 70 - mA mA - TBD TBD TBD TBD TBD TBD TBD - mA mA mA mA mA mA mA AC-Link Static Digital Specifications (T ambient = 25 ºC, DVdd = 3.3 V ± 5%, AVss = DVss = 0 V; 50 pF external load) Parameter Input Voltage Range Low level input range High level input voltage High level output voltage Low level output voltage Input Leakage Current (AC-Link inputs) Output Leakage Current (AC-Link outputs - Hi-Z) Output buffer drive current 2.1.5. Symbol Vin Vil Vih Voh Vol - Min -0.30 0.65 x DVdd 0.90 x DVdd -10 -10 - Typ 4 Max DVdd + 0.30 0.35 x DVdd 0.1 x DVdd 10 10 - Unit V V V V V µA µA mA STAC9766 Analog Performance Characteristics (T ambient = 25 ºC, AVdd = 5.0 V ± 5%, DVdd = 3.3 V ± 5%, AVss = DVss = 0 V; 1 KHz input sine wave; Sample Frequency = 48 KHz; 0dB = 1 Vrms, 10 KΩ / 50 pF load, Testbench Characterization BW: 20 Hz – 20 KHz, 0dB settings on all gain stages) Parameter Full Scale Input Voltage: All Analog Inputs except Mic Mic Inputs (Note 1) Full Scale Output: Line Output PCM (DAC) to LINE_OUT MONO_OUT HEADPHONE_OUT (32 Ω load) (peak) Analog S/N: (Note 2) CD to LINE_OUT Other to LINE_OUT IDT™ 10 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING Min Typ Max Unit - 1.0 0.03 - Vrms Vrms - - - 1.0 1.0 1.0 50 - Vrms Vrms Vrms mW - 103 103 - dB dB STAC9766/9767 V 7.4 12/06 STAC9766/9767 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING Parameter D/A to LINE_OUT LINE_IN to A/D with High pass filter enabled Analog Frequency Response (Note 3) Total Harmonic Distortion: (Note 4) CD to LINE_OUT Other to LINE_OUT D/A to LINE_OUT (full scale) LINE_IN to A/D with High pass filter enabled HEADPHONE_OUT A/D & D/A Digital Filter Pass Band (Note 5) A/D & D/A Digital Filter Transition Band A/D & D/A Digital Filter Stop Band A/D & D/A Digital Filter Stop Band Rejection (Note 6) DAC Out-of-Band Rejection (Note 7) Group Delay (48 KHz sample rate) Any Analog Input to LINE_OUT Crosstalk (10 KHz Signal Frequency) Any Analog Input to LINE_OUT Crosstalk (1 KHz Signal Frequency) Spurious Tone Rejection Attenuation, Gain Step Size Input Impedance (Note 8) Input Capacitance VREFout Interchannel Gain Mismatch ADC Interchannel Gain Mismatch DAC Note: 1. 2. 3. 4. 5. 6. 7. 8. PC AUDIO Min 20 Typ 95 85 - Max 20,000 Unit dB dB Hz 84 74 20 19,200 28,800 100 55 70 - 95 95 84 80 - 19,200 28,800 1 0.5 0.5 dB dB dB dB dB Hz Hz Hz dB dB ms dB dB dB dB KΩ pF V dB dB 100 100 1.5 50 15 0.5 x AVdd - With +30 dB Boost on, 1.0 Vrms with Boost off Ratio of Full Scale signal to idle channel noise output is measured “A weighted” over a 20 Hz to a 20 KHz bandwidth. (AES17-1991 Idle Channel Noise or EIAJ CP-307 Signal-to-noise Ratio). ± 1dB limits for Line Output & 0dB gain 20 KHz BW, 48 KHz Sample Frequency ± 0.25dB limits Stop Band rejection determines filter requirements. Out-of-Band rejection determines audible noise. The integrated Out-of-Band noise generated by the DAC process, during normal PCM audio playback, over a bandwidth 28.8 to 100 KHz, with respect to a 1 Vrms DAC output. For all inputs except PC BEEP. 2.1.6. STAC9767 Analog Performance Characteristics (T ambient = 2 5 º C , A V d d = 3 . 3 V ± 5 % , D V d d = 3 . 3 V ± 5 % , A V s s = D V s s = 0 V ; 1 K H z i n p u t s i n e wave; Sample Frequency=48KHz; 0dB=1Vrms, 10KΩ / 50 pFload, TestbenchCharacterization BW: 20Hz–20KHz, 0dB settings on all gain stages) Parameter Full Scale Input Voltage: All Analog Inputs except Mic Mic Inputs (Note 1) Full Scale Output: Line Output IDT™ 11 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING Min Typ Max Unit - 1.0 0.03 - Vrms Vrms - 0.5 - Vrms STAC9766/9767 V 7.4 12/06 STAC9766/9767 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING Parameter PCM (DAC) to LINE_OUT MONO_OUT HEADPHONE_OUT (32 Ω load) (peak) Analog S/N: (Note 2) CD to LINE_OUT Other to LINE_OUT D/A to LINE_OUT LINE_IN to A/D with High pass filter enabled Analog Frequency Response (Note 3) Total Harmonic Distortion: (Note 4) CD to LINE_OUT Other to LINE_OUT D/A to LINE_OUT (full scale) LINE_IN to A/D with High pass filter enabled HEADPHONE_OUT A/D & D/A Digital Filter Pass Band (Note 5) A/D & D/A Digital Filter Transition Band A/D & D/A Digital Filter Stop Band A/D & D/A Digital Filter Stop Band Rejection (Note 6) DAC Out-of-Band Rejection (Note 7) Group Delay (48 KHz sample rate) Any Analog Input to LINE_OUT Crosstalk (10 KHz Signal Frequency) Any Analog Input to LINE_OUT Crosstalk (1 KHz Signal Frequency) Spurious Tone Rejection Attenuation, Gain Step Size Input Impedance (Note 8) Input Capacitance VREFout Interchannel Gain Mismatch ADC Interchannel Gain Mismatch DAC Gain Drift Note: 1. 2. 3. 4. 5. 6. 7. 8. IDT™ Min PC AUDIO Max - Typ 0.5 0.5 12.5 - Unit Vrms Vrms mW 20 97 97 95 85 - 20,000 dB dB dB dB Hz 74 20 19,200 28,800 100 55 70 - 95 95 19,200 28,800 1 0.5 0.5 - dB dB dB dB dB Hz Hz Hz dB dB ms dB dB dB dB KΩ pF V dB dB ppm/ºC 84 84 80 100 100 1.5 50 15 0.5 X AVdd 100 With +30 dB Boost on, 1.0Vrms with Boost off Ratio of Full Scale signal to idle channel noise output is measured “A weighted” over a 20 Hz to a 20 KHz bandwidth. (AES17-1991 Idle Channel Noise or EIAJ CP-307 Signal-to-noise Ratio). ± 1dB limits for Line Output & 0 dB gain 20 KHz BW, 48 KHz Sample Frequency ± 0.25dB limits Stop Band rejection determines filter requirements. Out-of-Band rejection determines audible noise. The integrated Out-of-Band noise generated by the DAC process, during normal PCM audio playback, over a bandwidth 28.8 to 100 KHz, with respect to a 1 Vrms DAC output. For all inputs except PC BEEP. 12 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING STAC9766/9767 V 7.4 12/06 STAC9766/9767 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING 2.2. PC AUDIO AC Timing Characteristics (T ambient = 25 °C, AVdd = 3.3 V or 5 V ± 5%, DVdd = 3.3V ± 5%, AVss = DVss = 0 V; 7 5 pF external load for BIT_CLK and 60pF external load for SDATA_IN) 2.2.1. Cold Reset Figure 2. Cold Reset Timing Trst2clk Tres_low RESET# Ttri2actv BIT_CLK Ttri2actv SDATA_IN Parameter RESET# active low pulse width RESET# inactive to SDATA_IN or BIT_CLK active delay RESET# inactive to BIT_CLK startup delay BIT_CLK active to RESET# asserted (Not shown in diagram) Symbol Tres_low Tri2actv Trst2clk Tclk2rst Min 1.0 0.01628 0.416 Typ - Max 25 400 - Units µs ns µs µs Note: BIT_CLK and SDATA_IN are in a high impedance state during reset. 2.2.2. Warm Reset Figure 3. Warm Reset Timing Tsync_high Tsync_2clk SYNC BIT_CLK Parameter SYNC active high pulse width SYNC inactive to BIT_CLK startup delay IDT™ Symbol Tsync_high Tsync2clk 13 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING Min 1.0 162.8 Typ 1.3 - STAC9766/9767 Max - Units µs ns V 7.4 12/06 STAC9766/9767 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING 2.2.3. PC AUDIO Clocks Figure 4. Clocks Timing Tclk_low BIT_CLK Tclk_high Tclk_period Tsync_low Tsync_high SYNC Tsync_period Parameter Symbol BIT_CLK frequency BIT_CLK period BIT_CLK output jitter BLT_CLK high pulse width (Note 1) BIT_CLK low pulse width (Note 1) SYNC frequency SYNC period SYNC high pulse width SYNC low pulse width Note: 1. Worst case duty cycle restricted to 45/55. 2.2.4. Tclk_period Tclk_high Tclk_low Tsync_period Tsync_high Tsync_low Min 36 36 - Typ 12.288 81.4 750 40.7 40.7 48.0 20.8 1.3 19.5 Max 45 45 - Units MHz ns ps ns ns KHz µs µs µs STAC9766/9767 Crystal Elimination Circuit and Clock Frequencies The STAC9766/9767 supports several clock frequency inputs as described in the following table. In general, when a 24.576 MHz xtal is not used, the XTALOUT pin should be tied to ground. This short to ground configures the part into an alternate clock mode and enables an on board PLL. CODEC Modes: P = The STAC9766/9767 as a Primary CODEC S = The STAC9766/9767 as a Secondary CODEC. Table 1. Clock Mode Configuration XTL_OUT Pin Config XTAL XTAL or open XTAL or open XTAL or open short to ground short to ground short to ground short to ground IDT™ CID1 Pin Config float float pulldown pulldown float float pulldown pulldown CID0 Pin Config float pulldown float pulldown float pulldown float pulldown Clock Source Input 24.576MHz crystal 12.288 MHz BIT_CLK 12.288 MHz BIT_CLK 12.288 MHz BIT_CLK 14.31818 MHz source 27 MHz source 48 MHz source 24.576 MHz source 14 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING STAC9766/9767 CODEC Mode P S S S P P P P CODEC D 0 1 2 3 0 0 0 0 V 7.4 12/06 STAC9766/9767 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING PC AUDIO Table 2. Common Clocks and Sources Clock Source Clock Frequency XTAL 24.576MHz BIT_CLK VGA 2.2.5. 12.288MHz 14.31818MHz Digital Video 27MHz USB 48MHz Data Setup and Hold (50pF external load) Figure 5. Data Setup and Hold Timing tco BIT_CLK T setup V ih SDATA_OUT SDATA_IN SYNC V il V oh V ol T hold Parameter Symbol Min Typ Max Setup to falling edge of BIT_CLK Tsetup 10 Hold from falling edge of BIT_CLK Thold 10 Output Valid Data from rising edge of BIT_CLK tco 15 Note: Setup and hold time parameters for SDATA_IN are with respect to the AC'97 controller. 2.2.6. Units ns ns ns Signal Rise and Fall Times (BIT_CLK: 75pF external load; from 10% to 90% of Vdd) (SDATA_IN: 60pF external load; from 10% to 90% of Vdd) Figure 6. Signal Rise and Fall Times Timing BIT_CLK Triseclk Tfallclk Trisedin Tfalldin SDATA_IN IDT™ 15 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING STAC9766/9767 V 7.4 12/06 STAC9766/9767 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING Parameter Symbol Triseclk Tfallclk Trisedin Tfalldin BIT_CLK rise time BIT_CLK fall time SDATA_IN rise time SDATA_IN fall time 2.2.7. Min - PC AUDIO Typ - Max 6 6 6 6 Units ns ns ns ns AC-Link Low Power Mode Timing Figure 7. AC-Link Low Power Mode Timing Slot 1 SYNC Slot 2 BIT_CLK Write to 0x20 SDATA_OUT Don't care Data PR4 Ts2_pdown SDATA_IN Note: BIT_CLK not to scale Parameter End of Slot 2 to BIT_CLK, SDATA_IN low 2.2.8. Symbol Ts2_pdown Min - Typ - Max 1.0 Units µs Typ - Max 25.0 Units ns ns ATE Test Mode Figure 8. ATE Test Mode Timing RESET# SDATA_OUT Tsetup2rst Hi-Z SDATA_IN, BIT_CLK Toff Parameter Setup to trailing edge of RESET# (also applies to SYNC) Rising edge of RESET# to Hi-Z delay Symbol Tsetup2rst Toff Min 15.0 - Note: 1) All AC-Link signals are normally low through the trailing edge of RESET#. Bringing SDATA_OUT high for the trailing edge of RESET# causes the STAC9766/9767 AC-Link outputs to go high-impedance, which is suitable for ATE in-circuit testing. Note: 2) Once the test mode has been entered, the STAC9766/9767 must be issued another RESET# with all AC-Link signals low to return to the normal operating mode. Note: 3) # denotes active low. IDT™ 16 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING STAC9766/9767 V 7.4 12/06 STAC9766/9767 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING PC AUDIO 3. TYPICAL CONNECTION DIAGRAM Figure 9. Typical Connection Diagram *OPTIONAL 2 Ω* Ferrite Bead 3.3V ± 5% 0.1 µF 1 µF 0.1 µF 25 AVdd1 0.1 µF 1 µF 38 1 AVdd2 DVdd1 0.1 µF (Near Clk source) CLOCK_IN* 9 *Add resistive divider when using 5V clock. OPTIONAL DVdd2 2 27 pF XTL_IN 24.576 MHz 12 PC_BEEP XTL_OUT 3 13 PHONE SDATA_OUT 14 AUX_L BIT_CLK AUX_R SDATA_IN 15 SYNC 16 VIDEO_L RESET# 17 VIDEO_R CID0 18 CID1 CD_L 19 EAPD CD_GND STAC9767 VREFOUT 20 CD_R VREF 27 pF 0Ω 5 22 Ω 6 8 10 27 pF TUNE TO LAYOUT 11 45 46 47 28 27 1 µF 21 MIC1 NC 22 MIC2 NC 23 NC LINE_IN_L SPDIF 24 LINE_IN_R GPIO1 32 1 µF* CAP2 GPIO0 0.1 µF LINE_OUT_L *OPTIONAL LINE_OUT_R 820 pF 29 820 pF 30 AFILT1 MONO_OUT HP_OUT_L EMI Filter 31 33 34 48 44 43 35 36 37 39 AFILT2 HP_COMM AVss1 26 AVss2 42 DVss1 4 DVss2 HP_OUT_R 7 40 HP_COMM should be tied to ground at the headphone pin. 41 *Terminate ground plane as close to codec as possible Analog Ground Digital Ground Pin 48: To Enable SPDIF, use a 1KΩ - 1 0 KΩ external pulldown. To Disable SPDIF, use a 1KΩ - 1 0 KΩ external pullup. Do NOT leave Pin 48 floating. The CD_GND signal is an AC signal return for the two CD input channels. It is normally biased at about 2.5V. The name of the pin in the AC97 specification is CD_GND, and this has confused many designers. It should not have any DC path to GND. Connecting the CD_GND signal directly to ground will change the internal bias of the entire CODEC, and cause significant distortion. If there is no analog CD input, then this pin can be No-Connect. IDT™ 17 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING STAC9766/9767 V 7.4 12/06 STAC9766/9767 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING 3.1. PC AUDIO Split Independent Power Supply Operation In PC applications, one power supply input to the STAC9766/9767 may be derived from a supply regulator and the other directly from the PCI power supply bus. When power is applied to the PC, the regulated supply input to the IC will be applied some time delay after the PCI power supply. Without proper on-chip partitioning of the analog and digital circuitry, some manufacturer's CODECs would be subject to on-chip SCR type latch-up. IDT’s STAC9766/9767 specifically allows power-up sequencing delays between the analog (AVddx) and digital (VDddx) supply pins. These two power supplies can power-up independently and at different rates with no adverse effects to the CODEC. The IC is designed with independent analog and digital circuitry that prevents on-chip SCR type latch-up. However, the STAC9766/9767 is not designed to operate for extended periods with only the analog supply active. Note: Pin 48: To Enable SPDIF, use a 1 KΩ - 1 0 KΩ external pulldown. To Disable SPDIF, use a 1 KΩ - 1 0 KΩ external pullup. Do NOT leave Pin 48 floating. Note: The CD_GND signal is an AC signal return for the two CD input channels. It is normally biased at about 2.5V. The name of the pin in the AC97 specification is CD_GND, and this has confused many designers. It should not have any DC path to GND. Connecting the CD_GND signal directly to ground will change the internal bias of the entire CODEC, and cause significant distortion. If there is no analog CD input, then this pin can be No-Connect. IDT™ 18 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING STAC9766/9767 V 7.4 12/06 STAC9766/9767 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING PC AUDIO Figure 10. Split Independent Power Supply Operation *Suggested 3.3V or 5V ± 5% 0.1 µF 1 µF 0.1 µF 0.1 µF 3.3V ± 5% 10 µF 0.1 µF (Near Clk source) 25 AVdd1 38 1 AVdd2 DVdd1 CLOCK_IN* 9 *Add resistive divider when using 5V clock. OPTIONAL DVdd2 27 pF XTL_IN 24.576 MHz 12 PC_BEEP XTL_OUT 27 pF 0Ω 13 PHONE SDATA_OUT 14 AUX_L BIT_CLK 15 SDATA_IN AUX_R SYNC 16 VIDEO_L RESET# 5 6 8 10 EMI Filter 22 Ω 27 pF TUNE TO LAYOUT 11 17 VIDEO_R CID0 18 CID1 CD_L STAC9766 (5V Analog) or STAC9767 (3.3V Analog) 19 CD_GND 20 CD_R EAPD VREFOUT VREF 45 46 47 28 27 1 µF 21 MIC1 NC 22 MIC2 NC 23 NC LINE_IN_L SPDIF 24 LINE_IN_R GPIO1 32 1 µF* CAP2 GPIO0 0.1 µF LINE_OUT_L *OPTIONAL LINE_OUT_R 820 pF 820 pF 29 AFILT1 MONO_OUT HP_OUT_L 30 31 33 34 48 44 43 35 36 37 39 AFILT2 HP_COMM AVss1 26 AVss2 42 DVss1 4 DVss2 HP_OUT_R 7 40 41 *Terminate ground plane as close to codec as possible Analog Ground IDT™ HP_COMM should be tied to ground at the headphone pin. 19 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING Digital Ground STAC9766/9767 V 7.4 12/06 STAC9766/9767 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING PC AUDIO 4. CONTROLLER, CODEC AND AC-LINK This section describes the physical and high-level functional aspects of the AC‘97-Controller to CODEC interface, referred to as AC-link. 4.1. AC-link Physical interface The STAC9766/9767 communicates with its companion Digital Controller via the AC-link digital serial interface. AC-link has been defined to support connections between a single Controller and up to four CODECs. All digital audio, modem, and handset data streams, as well as all control (command/status) information are communicated over this serial interconnect, which consists of a clock (BIT_CLK), frame synchronization (SYNC), serial data in (SDATA_IN), serial data out (SDATA_OUT), and a reset (RESET#). 4.2. Controller to Single CODEC The simplest and most common AC‘97 system configuration is a point-to-point AC-link connection between Controller and the STAC9766/9767, as illustrated in Figure 11. Figure 11. AC-Link to its Companion Controller SYNC XTAL_IN BIT_CLK Digital A DC'97 Controller SDATA_OUT AC'97 Codec SDATA_IN XTAL_OUT RESET# A primary CODEC may act as either a source or a consumer of BIT_CLK, depending on the configuration. While RESET# is asserted, if a clock is present at the BIT_CLK pin for at least five cycles before RESET# is de-asserted, then the CODEC is a consumer of BIT_CLK, and must not drive BIT_CLK when RESET# is de-asserted. The clock is being provided by other than the primary CODEC, for instance by the controller or an independent clock chip. In this case the primary CODEC must act as a consumer of the BIT_CLK signal as if it were a secondary CODEC. This clock source detection must be done each time the RESET# line is asserted. In the case of a warm reset, where the clock is halted but RESET# is not asserted, the CODEC must remember the clock source, and not begin generating the clock on the assertion of SYNC if the CODEC had previously determined that it was a consumer of BIT_CLK. IDT™ 20 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING STAC9766/9767 V 7.4 12/06 STAC9766/9767 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING PC AUDIO Figure 12. CODEC Clock Source Detection AC'97 Clock Source Detection RESET# Signal Asserted Yes 12.288MHz signal on BIT_CLK is being generated externally; codec uses this signal as the clock. Yes 24.576MHz Crystal on XTL_IN and XTL_OUT used by codec to generate clock on BIT_CLK Yes 24.576 MHz signal on XTL_IN used by codec to generate 12.288MHz clock on BIT_CLK Yes 14.318 MHz signal on XTL_IN used by codec to generate 12.288MHz clock on BIT_CLK BIT_CLK Toggling? No After RESET# Signal Deasserted 24.576MHz crystal present? No 24.576MHz oscillator present? No 14.318MHz oscillator presnent? No Error condition - no clock source present The STAC9766/9767 uses the XTAL_OUT pin (pin 3) and the CID0 and CID1 pins (pins 45 & 46) to determine its alternate clock frequencies. See section 2.2.4: page14 for additional information on Crystal Elimination and for supported clock frequencies. If, when the RESET# signal has been de-asserted, the CODEC has not detected a signal on BIT_CLK, as defined in the previous paragraph, then the AC‘97 CODEC derives its clock internally from an externally attached 24.576 MHz crystal or oscillator (or optionally from an external 14.318 MHz oscillator), and drives a buffered 12.288 MHz clock to its digital companion Controller over AC-link under the signal name “BIT_CLK”. Clock jitter at the DACs and ADCs is a fundamental impediment to high quality output, and the internally generated clock will provide AC‘97 with a clean clock that is independent of the physical proximity of AC‘97’s companion Digital Controller (henceforth referred to as “the Controller”). If BIT_CLK begins toggling while the RESET# signal is still asserted, the clock is being provided by other than the primary CODEC, for instance by the controller or by a discrete clock source. In this case, the primary CODEC must act as a consumer of the BIT_CLK signal as if it were a secondary CODEC. IDT™ 21 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING STAC9766/9767 V 7.4 12/06 STAC9766/9767 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING PC AUDIO The beginning of all audio sample packets, or Audio Frames, transferred over AC-link is synchronized to the rising edge of the SYNC signal. SYNC is driven by the Controller. The Controller generates SYNC by dividing BIT_CLK by 256 and applying some conditioning to tailor its duty cycle. This yields a 48 KHz SYNC signal whose period defines an audio frame. Data is transitioned on AC-link on every rising edge of BIT_CLK, and subsequently sampled by the receiving device on the receiving side of AC-link on each immediately following falling edge of BIT_CLK. 4.3. Controller to Multiple CODECs Several vendor specific methods of supporting multiple CODEC configurations on AC-link have been implemented or proposed, including CODECs with selective AC-link pass-through and controllers with duplicate AC-links. Potential implementations include: • 6-channel audio using 3 x 2-channel CODECs. • Separate CODECs for independent audio and modem AFE. • Docking stations, where one CODEC is in the laptop and another is in the dock. This specification defines support for up to four CODECs on the AC-link. By definition there can be one Primary CODEC (ID 00) and up to three Secondary CODECs (IDs 01,10, and 11). The CODEC ID functions as a chip select. Secondary devices therefore have completely orthogonal register sets; each is individually accessible and they do not share registers. Multiple CODEC AC-link implementations must run off a common BIT_CLK. They can potentially save Controller pins by sharing SYNC, SDATA_OUT, and RESET# from the AC‘97 Digital Controller. Each device requires its own SDATA_IN pin back to the Controller. This prevents contention of multiple devices on one serial input line. Support for multiple CODEC operation necessitates a specially designed Controller. An AC‘97 Digital Controller that supports multiple CODEC configurations implements multiple SDATA_IN inputs, supporting one Primary CODEC and up to three Secondary CODECs. 4.3.1. Primary CODEC Addressing Primary AC‘97 CODECs respond to register read and write commands directed to CODEC ID 00. Primary devices must be configurable (by hardwiring, strap pin(s), or other methods) as CODEC ID 00, and reflect this in the two-bit CODEC ID field(s) of the Extended Audio and/or Extended Modem ID Register(s). The Primary CODEC may either drive the BIT_CLK signal or consume a BIT_CLK signal provided by the digital controller or other clock generator. 4.3.2. Secondary CODEC Addressing Secondary AC‘97 CODECs respond to register read and write commands directed to CODEC IDs 01, 10, or 11. Secondary devices must be configurable (via hardwiring, strap pin(s), or other methods) as CODEC IDs 01, 10, or 11 in the two-bit field(s) of the Extended Audio and/or Extended Modem ID Register(s). IDT™ 22 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING STAC9766/9767 V 7.4 12/06 STAC9766/9767 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING PC AUDIO CODECs configured as Secondary must power up with the BIT_CLK pin configured as an input. Using the provided BIT_CLK signal is necessary to ensure that everything on the AC-link is synchronous. BIT_CLK is the clock source (multiplied by 2 so that the internal rate is 24.576 MHz). 4.3.3. CODEC ID Strapping Audio CODECs in the 48-pin package use pins 45 and 46 (defined as ID0# and ID1#) as strapping (i.e. configuration) pins to configure the CODEC ID. The ID0# and ID1# strapping bits adopt inverted polarity and default to 00 = Primary (via a weak internal pullup) when left floating. This eliminates the need for external resistors for CODECs configured as Primary, and maintains backward compatibility with existing layouts that treat pins 45 and 46 as “no connect” or cap to ground. Pulldowns are typically 1 KΩ - 10 KΩ and connected to Digital (not Analog) Ground. Table 3. Recommended CODEC ID Strapping 4.4. CID1 (pin 46) CID0 (pin 45) Configuration NC (weak internal pullup) NC (weak internal pullup) Primary ID 00 NC (weak internal pullup) pulldown pulldown NC (weak internal pullup) Secondary ID 01 Secondary ID 10 pulldown pulldown Secondary ID 11 Clocking for Multiple CODEC Implementations To keep the system synchronous, all Primary and Secondary CODEC clocking must be derived from the same clock source, so they are operating on the same time base. In addition, all AC-link protocol timing must be based on the BIT_CLK signal, to ensure that everything on the AC-link will be synchronous. The following are potential 24.576 MHz clock options available to a Secondary CODEC: • Using an external 24.576 MHz signal source (external oscillator or AC‘97 Digital Controller) • Using the Primary’s XTAL_OUT • Using the Primary’s BIT_CLK output to derive 24.576 MHz See section 2.2.3: page14 for clock frequencies supported and configurations. 4.4.1. STAC9766/9767 as a Primary CODEC Primary devices are required to support correctly either of the following clocking options: • 24.576 MHz crystal attached to XTAL_IN and XTAL_OUT • 24.576 MHz external oscillator provided to XTAL_IN • 12.288 MHz oscillator provided to the BIT_CLK input The Primary device may also optionally support the following clocking option: • 14.318 MHz external oscillator provided to XTAL_IN See section 2.2.3: page14 for clock frequencies supported and configurations. IDT™ 23 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING STAC9766/9767 V 7.4 12/06 STAC9766/9767 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING 4.4.2. PC AUDIO STAC9766/9767 as a Secondary CODEC Secondary devices are required to function correctly using one or more of the following clocking options: • 24.576 MHz external oscillator provided to XTAL_IN (synchronous and in phase with Primary 24.576 MHz clock) • BIT_CLK input provided by the Primary. In this mode, a clock at XTAL_IN (Pin 2) is ignored. See section 2.2.3: page14 for clock frequencies supported and configurations. 4.5. AC-link Power Management 4.5.1. Powering down the AC-link The AC-link signals can be placed in a low power mode. When AC‘97’s Powerdown Register (26h) is programmed to the appropriate value, both BIT_CLK and SDATA_IN are brought to and held at a logic low voltage level. After signaling a reset to AC‘97, the AC‘97 Controller should not attempt to play or capture audio data until it has sampled a CODEC Ready indication from AC‘97. Figure 13. STAC9766/9767 Powerdown Timing SYNC BIT_CLK SDATA_OUT slot 2 per frame TAG SDATA_IN slot 2 per frame TAG Write to 0x20 DATA PR4 Note: BIT_CLK not to scale BIT_CLK and SDATA_IN are transitioned low immediately following decode of the write to the Powerdown Register (26h) with PR4. When the AC‘97 Controller driver is at the point where it is ready to program the AC-link into its low power mode, slots 1 and 2 are assumed to be the only valid stream in the audio output frame. After programming the AC‘97 device to this low power, halted mode, the AC‘97 Controller is required to drive and keep SYNC and SDATA_OUT low. Once the AC‘97 CODEC has been instructed to halt BIT_CLK, a special “wake-up” protocol must be used to bring the AC-link to the active mode, since normal audio output and input frames can not be communicated in the absence of BIT_CLK. 4.5.2. Waking up the AC-link There are two methods for bringing the AC-link out of a low power, halted mode. Regardless of the method, it is the AC‘97 Controller that performs the wake-up task. IDT™ 24 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING STAC9766/9767 V 7.4 12/06 STAC9766/9767 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING PC AUDIO AC-link protocol provides for a “Cold AC‘97 Reset”, and a “Warm AC‘97 Reset”. The current power down state would ultimately dictate which form of AC‘97 reset is appropriate. Unless a “cold” or “register” reset (a write to the Reset Register) is performed, wherein the AC‘97 registers are initialized to their default values, registers are required to keep state during all power down modes. Once powered down, re-activation of the AC-link via re-assertion of the SYNC signal must not occur for a minimum of four audio frame times following the frame in which the power down was triggered. When AC-link powers up the CODEC indicates readiness via the CODEC Ready bit (input slot 0, bit 15). 4.5.3. CODEC Triggers Wake-up The STAC9766/9767 (running off Vaux) can trigger a wake event (PME#) by transitioning SDATA_IN from low to high and holding it high until either a warm or cold reset is observed on the AC-link. This functionality is typically implemented in modem CODECs that detect ring, Caller ID, etc. Note that when the AC-link is either programmed to the low power mode or shut off completely, BIT_CLK may stop if the primary CODEC is supplying the clock, which shuts down the AC-link clock to the Secondary CODEC1 . In order for a Secondary CODEC to react to an external event (phone ringing), it must support an independent clocking scheme for any PME# associated logic that must be kept alive when the AC-link is down. This includes logic to asynchronously drive SDATA_IN to a logic high-level which signals a wake request to the AC‘97 Digital Controller. 4.5.4. CODEC Reset There are three types of AC‘97 reset: • A cold reset where all AC‘97 logic (most registers included) is initialized to its default state. • A warm reset where the contents of the AC‘97 register set are left unaltered. • A register reset which only initializes the AC‘97 registers to their default states. 4.5.4.1. Cold AC‘97 Reset A cold reset is achieved by asserting RESET# low for the minimum specified time, then subsequently de-asserting RESET# high. BIT_CLK and SDATA_IN will be activated, or re-activated as the case may be, and all AC‘97 control registers will be initialized to their default power-on reset values. RESET# is an asynchronous AC‘97 input. 4.5.4.2. Warm AC‘97 Reset A warm AC‘97 reset will re-activate the AC-link without altering the current AC‘97 register values. A warm reset is signaled by driving SYNC high for a minimum of 1 µs in the absence of BIT_CLK. 1. IDT™ Secondary CODEC always configures its BIT_CLK pin as an input. 25 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING STAC9766/9767 V 7.4 12/06 STAC9766/9767 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING PC AUDIO Within normal audio frames SYNC is a synchronous AC‘97 input. However, in the absence of BIT_CLK, SYNC is treated as an asynchronous input used in the generation of a warm reset to AC‘97. AC‘97 MUST NOT respond with the activation of BIT_CLK until SYNC has been sampled low again by AC‘97. This will preclude the false detection of a new audio frame. 4.5.4.3. Register AC‘97 Reset Most registers in an AC device can be restored to their default values by performing a write (any value) to the Reset Register, 00h. IDT™ 26 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING STAC9766/9767 V 7.4 12/06 STAC9766/9767 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING PC AUDIO 5. AC-LINK DIGITAL INTERFACE 5.1. Overview AC-link is the 5 pin digital serial interface that links AC‘97 CODEC to Controller. The AC-link protocol is a bi-directional, fixed clock rate, serial digital stream. AC-link handles multiple input and output PCM audio streams, as well as control register accesses, employing a time division multiplexed (TDM) scheme that divides each audio frame into 12 outgoing and 12 incoming data streams, each with 20-bit sample resolution. The STAC9766/9767 DACs, ADCs and SPDIF can be assigned to slots 3&4, 6&9, 7&8 or 10&11. Figure 14. Bi-directional AC-link Frame with Slot Assignments SLOTS 0 1 2 3 4 5 6 7 8 9 10 11 12 TAG CMD ADDR CMD DATA PCM LEFT PCM RT NA PCM CTR PCM LSURR PCM RSURR PCM LFE SPDIF SPDIF IO CTRL PCM LEFT PCM RT LINE1 ADC PCM MIC Vendor RSVD Vendor RSVD Vendor RSVD LINE2 ADC HSET ADC IO STATUS SYNC OUTGOING STREAMS (Controller output - SDATA_OUT) TAG INCOMING STREAMS STATUS STATUS ADDR DATA (codec output - SDATA_IN) TAG PHASE DATA PHASE Slot 12 can be used by the AC'97 Codec if a Modem Codec is not present. Table 4. AC-link Output Slots (Transmitted from the Controller) Slot Name Description 0 SDATA_OUT TAG 1 Control CMD ADDR write port MSBs indicate which slots contain valid data; LSBs convey CODEC ID Read/write command bit plus 7-bit CODEC register address 2 Control DATA write port 16-bit command register write data 3, 4 5 PCM L&R DAC playback Modem Line 1 DAC 20-bit PCM data for Left and Right channels 16-bit modem data for modem Line 1 output 6, 7, 8, 9 PCM Center, Surround L&R, LFE 20-bit PCM data for Center, Surround L&R, LFE channels IDT™ 10 11 Modem Line 2 DAC Modem handset DAC 16-bit modem data for modem Line 2 output 16-bit modem data for modem Handset output 12 Modem IO control GPIO write port for modem Control 12 10-11 CODEC IRQ SPDIF Out Can be used by CODEC if a modem CODEC is not present. Optional AC-link bandwidth for SPDIF output 10-12 Double rate audio Optional AC-link bandwidth for 88.26KHz or 96KHz on L, C, R channels 27 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING STAC9766/9767 V 7.4 12/06 STAC9766/9767 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING PC AUDIO Table 5. The AC-link input slots (transmitted from the CODEC) 5.2. Slot Name Description 0 1 SDATA_IN TAG STATUS ADDR read port MSBs indicate which slots contain valid data MSBs echo register address; LSBs indicate which slots request data 2 STATUS DATA read port 16-bit command register read data 3, 4 5 PCM L&R ADC record Modem Line 1 ADC 20-bit PCM data from Left and Right inputs 16-bit modem data from modem Line1 input 6-11 PCM ADC Record 20-bit PCM data - Alternative Slots for Input 12 GPIO Status GPIO read port and interrupt status AC-link Serial Interface Protocol The AC‘97 Controller signals synchronization of all AC-link data transactions. The AC‘97 CODEC, Controller, or external clock source drives the serial bit clock (BIT_CLK) onto the AC-link, which the AC‘97 Controller then qualifies with a synchronization signal to construct audio frames. SYNC, fixed at 48 KHz, is derived by dividing down the serial bit clock (BIT_CLK). BIT_CLK, fixed at 12.288 MHz, provides the necessary clocking granularity to support twelve 20-bit outgoing and incoming time slots. AC-link serial data is transitioned on each rising edge of BIT_CLK. The receiver of AC-link data (CODEC for outgoing data and Controller for incoming data) samples each serial bit on the falling edges of BIT_CLK. The AC-link protocol provides for a special 16-bit time slot (Slot 0) wherein each bit conveys a valid tag for its corresponding time slot within the current audio frame. A 1 in a given bit position of slot 0 indicates that the corresponding time slot within the current audio frame has been assigned to a data stream, and contains valid data. If a slot is tagged invalid, it is the responsibility of the source of the data, (AC‘97 CODEC for the input stream, AC‘97 Controller for the output stream), to stuff all bit positions with 0 during that slot’s active time. SYNC remains high for a total duration of 16 BIT_CLKs at the beginning of each audio frame. The portion of the audio frame where SYNC is high is defined as the “Tag Phase”. The remainder of the audio frame where SYNC is low is defined as the “Data Phase”. Additionally, for power savings, BIT_CLK, SYNC, and all data signals can be halted. This requires that an AC‘97 CODEC be implemented as a static design to allow its register contents to remain intact when entering a power savings mode. 5.2.1. AC-link Variable Sample Rate Operation The AC-link serial interconnect defines a digital data and control pipe between the Controller and the CODEC. The AC-link supports twelve 20-bit slots at 48 KHz on SDATA_IN and SDATA_OUT. The time division multiplexed (TDM) “slot-based” architecture supports a per-slot valid tag infrastructure that the source of each slot’s data sets or clears to indicate the validity of the slot data within the current audio frame. This tag infrastructure can be used to support transfers between Controller and CODEC at any sample rate. IDT™ 28 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING STAC9766/9767 V 7.4 12/06 STAC9766/9767 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING 5.2.2. PC AUDIO Variable Sample Rate Signaling Protocol AC-link’s tag infrastructure imposes FIFO requirements on both sides of the AC-link. For example, in passing a 44.1 KHz stream across the AC-link, for every 480 audio output frames that are sent across, 441 of them must contain valid sample data. Does the AC‘97 Digital Controller pass all 441 PCM samples followed by 39 invalid slots? Or does the AC‘97 Digital Controller evenly interleave valid and non-valid slots? Each possible method brings with it different FIFO requirements. To achieve interoperability between AC‘97 Digital Controllers and CODECs designed by different manufacturers, it is necessary to standardize the scheme for at least one side of the AC-link so that the FIFO requirements will be common to all designs. The CODEC side of the AC-link is the focus of this standardization. The new standard approach calls for the addition of “on demand” slot request flags. These flags are passed from the CODEC to the AC‘97 Digital Controller during every audio input frame. Each time the AC‘97 Digital Controller sees one or more of the newly-defined slot request flags set active (low) in a given audio input frame, it knows that it must pass along the next PCM sample for the corresponding slot(s) in the AC-link output frame that immediately follows. The VRA (Variable Rate Audio) bit in the Extended Audio Status and Control Register must be set to 1 to enable variable sample rate audio operation. Setting the VRA = 1 has two functions: 1. Enables PCM DAC/ADC conversions at variable sample rates by write enabling Sample Rate Registers 2C-34h. 2. Enables the on-demand CODEC-to-Controller signaling protocol using SLOTREQ bits that becomes necessary when a DACs sample rate varies from the 48 KHz AC-link serial frame rate The table below summarizes the behavior: Table 6. VRA Behavior AC‘97 Functionality VRA = 0 VRA = 1 SLOTREQ bits sample rate registers always 0 (data each frame) forced to 48 KHz 0 or 1 (data on demand) writable Note: If more than one CODEC is being used with the SAME controller DMA engine, VRA should NOT be used. For variable sample rate output, the CODEC examines its sample rate control registers, the state of its FIFOs, and the incoming SDATA_OUT tag bits at the beginning of each AC-link output frame to determine which SLOTREQ bits to set active (low). SLOTREQ bits asserted during the current AC-link input frame signal which active output slots require data from the AC‘97 Digital Controller in the next audio output frame. An active output slot is defined as any slot supported by the CODEC that is not in a power-down state. For fixed 48 KHz operation the SLOTREQ bits are always set active (low) and a sample is transferred in each frame. For variable sample rate input, the tag bit for each input slot indicates whether valid data is present or not. Thus, even in variable sample rate mode, the CODEC is always the master: for SDATA_IN (CODEC to Controller), the CODEC sets the TAG bit; for SDATA_OUT (Controller to CODEC), the CODEC sets the SLOTREQ bit and then checks for the TAG bit in the next frame. IDT™ 29 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING STAC9766/9767 V 7.4 12/06 STAC9766/9767 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING PC AUDIO The VRM (Variable Rate Mic Audio) bit in the Extended Audio Status and Control Register controls the optional MIC ADC input behavior in the same way that VRA = 1 controls the PCM ADC. 5.2.3. SLOTREQ Behavior and Power Management SLOTREQ bits for fixed rate, powered down, and all unsupported slots should be driven with 0 for maximum compatibility with the original AC '97 Component Specification. When a DAC channel is powered down, it disappears completely from the serial frame: output tag and slot are ignored, and the SLOTREQ bit is absent (forced to zero). When the Controller wants to power-down a channel, all it needs to do is: 1. Disable source of DAC samples in Controller. 2. Set PR bit for DAC channel in Registers 26h, 2Ah, or 3Eh. When it wants to power up the channel, all it needs to do is: 5.2.4. 1. Clear PR bit for DAC channel in Registers 26h, 2Ah, or 3Eh. 2. Enable source of DAC samples in Controller. Primary and Secondary CODEC Register Addressing The 2-bit CODEC ID field in the LSBs of Output Slot 0 is an addition to the original AC-link protocol that enables an AC‘97 Digital Controller to independently access Primary and Secondary CODEC registers. For Primary CODEC access, the AC‘97 Digital Controller: 1. Sets the AC-link Frame valid bit (Slot 0, bit 15). 2. Validates the tag bits for Slot 1 and 2 Command Address and Data (Slot 0, bits 14 and 13). 3. Sets a zero value (00) into the CODEC ID field (Slot 0, bits 1 and 0). 4. Transmits the desired Primary CODEC Command Address and Command Data in Slots 1 and 2. For Secondary CODEC access, the AC‘97 Digital Controller: 1. Sets the AC-link Frame valid bit (Slot 0, bit 15). 2. Places a non-zero value (01, 10, or 11) into the CODEC ID field (Slot 0, bits 1 and 0). 3. Transmits the desired Secondary CODEC Command Address and Command Data in Slots 1 and 2. Secondary CODECs disregard the Command Address and Command Data (Slot 0, bits 14 and 13) tag bits. In a sense the Secondary CODEC ID field functions as an alternative Valid Command Address (for Secondary reads and writes) and Command Data (for Secondary writes) tag indicator. Secondary CODECs must monitor the Frame Valid bit, and ignore the frame (regardless of the state of the Secondary CODEC ID bits) if it is not valid. AC‘97 Digital Controllers should set the frame valid bit for a frame with a Secondary register access, even if no other bits in the output tag slot except the Secondary CODEC ID bits are set. IDT™ 30 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING STAC9766/9767 V 7.4 12/06 STAC9766/9767 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING 5.3. PC AUDIO AC-link Output Frame (SDATA_OUT) The AC-link output frame data streams correspond to the multiplexed bundles of all digital output data targeting AC‘97’s DAC inputs, and control registers. As mentioned earlier, each AC-link output frame supports up to twelve 20-bit outgoing data time slots. Slot 0 is a special reserved time slot containing 16-bits which are used for AC-link protocol infrastructure. Figure 15 illustrates the time slot based AC-link protocol. Figure 15. AC-Link Audio Output Frame Data Phase Tag Phase SYNC 20.8 uS (48 kHZ) 12.288 MHz BIT_CLK SDATA_OUT valid Frame slot1 slot2 slot(12) "0" CID1 CID0 19 "0" 19 "0" 19 "0" 19 "0" End of previous audio frame Time Slot "Valid" Bits Slot 1 Slot 2 Slot 3 Slot 12 ("1" = time slot contains valid PCM data) A new AC-link output frame begins with a low to high transition of SYNC. SYNC is synchronous to the rising edge of BIT_CLK. On the immediately following falling edge of BIT_CLK, the AC‘97 CODEC samples the assertion of SYNC. This falling edge marks the time when both sides of AC-link are aware of the start of a new audio frame. On the next rising of BIT_CLK, the AC‘97 Controller transitions SDATA_OUT into the first bit position of slot 0 (Valid Frame bit). Each new bit position is presented to AC-link on a rising edge of BIT_CLK, and subsequently sampled by the AC‘97 CODEC on the following falling edge of BIT_CLK. This sequence ensures that data transitions and subsequent sample points for both incoming and outgoing data streams are time aligned. Figure 16. Start of an Audio Output Frame SYNC asserted SYNC detected by codec first SDATA_OUT bit of frame SYNC BIT_CLK valid Frame SDATA_OUT slot1 slot2 End of previous audio frame SDATA_OUT’s composite stream is MSB justified (MSB first) with all non-valid slots’ bit positions stuffed with 0 by the AC‘97 Controller. If there are less than 20 valid bits within an assigned and valid time slot, the AC‘97 Controller always stuffs all trailing non-valid bit positions of the 20-bit slot with 0. As an example, consider an 8-bit sample stream that is being played out to one of the STAC9766/ 9767 DACs. The first 8-bit positions are presented to the DAC (MSB justified) followed by the next IDT™ 31 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING STAC9766/9767 V 7.4 12/06 STAC9766/9767 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING PC AUDIO 12 bit positions, which are stuffed with 0 by the AC‘97 Controller. This ensures that regardless of the resolution of the implemented DAC (16, 18 or 20-bit), no DC biasing will be introduced by the least significant bits. When mono audio sample streams are output from the AC‘97 Controller it is necessary that BOTH left and right sample stream time slots be filled with the same data. 5.3.1. Slot 0: TAG / CODEC ID Table 7. Output Slot 0 Bit Definitions Bit Description 15 Frame Valid 14 13 Slot 1 Primary CODEC Valid Command Address bit (Primary CODEC only) Slot 2 Primary CODEC Valid Command Data bit (Primary CODEC only) Slot 3-12 Valid Data bits 12 11 Slot 3: PCM Left channel Slot 4: PCM Right channel 10 Slot 5: Modem Line 1 (not used on STAC9766/9767) 9 Slot 6: Alternative PCM1 Left 8 7 Slot 7: Alternative PCM2 Left Slot 8: Alternative PCM2 Right 6 Slot 9: Alternative PCM1 Right 5 4 Slot 10: SPDIF Left Slot 11: SPDIF Right 3 Slot 12: Audio GPIO 2 1-0 Reserved (Set to 0) 2-bit CODEC ID field (00 reserved for Primary; 01, 10, 11 indicate Secondary) Note: The DAC can be assigned to slots 3&4, 6&9, 7&8, or 10&11. Within slot 0, the first bit is a global bit (SDATA_OUT slot 0, bit 15) which flags the validity for the entire audio frame. If the “Valid Frame” bit is a 1, this indicates that the current audio frame contains at least one time slot of valid data. The next 12 bit positions sampled by AC‘97 indicate which of the corresponding 12 time slots contain valid data. In this way data streams of differing sample rates can be transmitted across AC-link at its fixed 48 KHz audio frame rate. The two LSBs of Slot 0 transmit the CODEC ID used to distinguish Primary and Secondary CODEC register access. 5.3.2. Slot 1: Command Address Port The command port is used to control features, and monitor status (see AC-link input frame Slots 1 and 2) for AC‘97 CODEC functions including, but not limited to, mixer settings and power management (refer to the control register section of this specification). IDT™ 32 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING STAC9766/9767 V 7.4 12/06 STAC9766/9767 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING PC AUDIO The control interface architecture supports up to 64 16-bit read/write registers, addressable on even byte boundaries. Only the even registers (00h, 02h, etc.) are currently defined, odd registers (01h, 03h, etc.) are reserved for future expansion. Note that shadowing of the control register file on the AC‘97 Controller is an option left open to the implementation of the AC‘97 Controller. The AC‘97 CODEC’s control register file is nonetheless required to be readable as well as writeable to provide more robust testability. AC-link output frame slot 1 communicates control register address, and write/read command information to the STAC9766/9767. Table 8. Command Address Port Bit Assignments Bit Description Comments 19 18:12 Read/Write command Control Register Index 1 = read, 0 = write Sixty-four 16-bit locations, addressed on even byte boundaries 11:0 Reserved Stuffed with 0s The first bit (MSB) sampled by AC‘97 indicates whether the current control transaction is a read or a write operation. The following 7 bit positions communicate the targeted control register address. The trailing 12 bit positions within the slot are reserved and must be stuffed with 0s by the AC‘97 Controller. 5.3.3. Slot 2: Command Data Port The command data port is used to deliver 16-bit control register write data in the event that the current command port operation is a write cycle. (as indicated by Slot 1, bit 19) • Bit(19:4) Control Register Write Data (Stuffed with 0 if current operation is a read) • Bit(3:0) Reserved (Stuffed with 0) If the current command port operation is a read, then the entire slot time must be stuffed with 0 by the AC‘97 Controller. 5.3.4. Slot 3: PCM Playback Left Channel AC-link output frame slot 3 is the composite digital audio left playback stream. In a typical “Games Compatible” PC this slot is composed of standard PCM (.wav) output samples digitally mixed (on the AC‘97 Controller or host processor) with music synthesis output samples. If a sample stream of resolution less than 20-bits is transferred, the AC‘97 Controller must stuff all trailing non-valid bit positions within this time slot with 0. The DAC can be assigned to slots 3&4, 6&9, 7&8, or 10&11. 5.3.5. Slot 4: PCM Playback Right Channel AC-link output frame slot 4 is the composite digital audio right playback stream. In a typical “Games Compatible” PC this slot is composed of standard PCM (.wav) output samples digitally mixed (on the AC‘97 Controller or host processor) with music synthesis output samples. If a sample stream of res- IDT™ 33 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING STAC9766/9767 V 7.4 12/06 STAC9766/9767 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING PC AUDIO olution less than 20-bits is transferred, the AC‘97 Controller must stuff all trailing non-valid bit positions within this time slot with 0. The DAC can be assigned to slots 3&4, 6&9, 7&8, or 10&11. 5.3.6. Slot 5: Not Used by STAC9766/9767 (Modem Line 1 Output Channel) Audio output frame slot 5 is reserved for modem operation and is not used by the STAC9766/9767 . 5.3.7. Slot 6 -11: DAC The DAC can be assigned to slots 3&4, 6&9, 7&8, or 10&11. 5.3.8. Slot 12: Audio GPIO Control Channel AC-link output frame slot 12 contains the audio GPIO control outputs. 5.4. AC-link Input Frame (SDATA_IN) The AC-link input frame data streams correspond to the multiplexed bundles of all digital input data targeting the AC‘97 Controller. As is the case for audio output frame, each AC-link input frame consists of twelve 20-bit time slots. Slot 0 is a special reserved time slot containing 16-bits which are used for AC-link protocol infrastructure. The following diagram illustrates the time slot-based AC-link protocol. Figure 17. STAC9766/9767 Audio Input Frame Data Phase Tag Phase SYNC 20.8 uS (48 kHZ) 12.288 MHz BIT_CLK SDATA_IN valid Frame slot1 slot2 slot(12) "0" "0" "0" 19 "0" 19 "0" 19 "0" 19 "0" End of previous audio frame Time Slot "Valid" Bits ("1" = time slot contains valid PCM data) Slot 1 Slot 2 Slot 3 Slot 12 A new AC-link input frame begins with a low to high transition of SYNC. SYNC is synchronous to the rising edge of BIT_CLK. On the immediately following falling edge of BIT_CLK, the AC‘97 CODEC samples the assertion of SYNC. This falling edge marks the time when both sides of AC-link are aware of the start of a new audio frame. On the next rising of BIT_CLK, the AC‘97 CODEC transitions SDATA_IN into the first bit position of slot 0 (“CODEC Ready” bit). Each new bit position is presented to AC-link on a rising edge of BIT_CLK, and subsequently sampled by the AC‘97 Controller on the following falling edge of BIT_CLK. This sequence ensures that data transitions and subsequent sample points for both incoming and outgoing data streams are time aligned. IDT™ 34 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING STAC9766/9767 V 7.4 12/06 STAC9766/9767 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING PC AUDIO Figure 18. Start of an Audio Input Frame SYNC detected first SDATA_OUT bit of frame SYNC BIT_CLK Codec Ready SDATA_IN slot1 slot2 End of previous audio frame SDATA_IN’s composite stream is MSB justified (MSB first) with all non-valid bit positions (for assigned and/or unassigned time slots) stuffed with 0 by the AC‘97 CODEC. SDATA_IN data is sampled on the falling edges of BIT_CLK. 5.4.1. Slot 0: TAG Within slot 0 the first bit is a global bit (SDATA_IN slot 0, bit 15), which flags whether the AC‘97 CODEC is in the “CODEC Ready” state or not. If the “CODEC Ready” bit is a 0, this indicates that the AC‘97 CODEC is not ready for normal operation. This condition is normal following the deassertion of power on reset for example, while the AC‘97 CODEC’s voltage references settle. When the AC-link “CODEC Ready” indicator bit is a 1 it indicates that the AC-link and AC‘97 CODEC control and status registers are in a fully operational state. CODEC must assert “CODEC Ready” within 400 µs after it starts receiving valid SYNC pulses from the controller, to provide indication of connection to the link and Control/Status registers are available for access. The AC`97 Controller and related software must wait until all of the lower four bits of the Control/Status Register, 26h, are set before attempting any register writes, or attempting to enable any audio stream, to avoid undesirable audio artifacts. Prior to any attempts at putting an AC‘97 CODEC into operation, the AC‘97 Controller should poll the first bit in the AC-link input frame (SDATA_IN slot 0, bit 15) for an indication that CODEC has gone “CODEC Ready”. Once an AC‘97 CODEC is sampled “CODEC Ready” 1 , then the next 12 bit positions sampled by the AC‘97 Controller indicate which of the corresponding 12 time slots are assigned to input data streams and contain valid data. 5.4.2. Slot 1: Status Address Port / SLOTREQ signaling bits 5.4.2.1. Status Address Port The status port is used to monitor status for the STAC9766/9767 functions including, but not limited to, mixer settings and power management. AC-link input frame slot 1’s stream echoes the control 1. There are several subsections within an AC‘97 CODEC that can independently go busy/ready. It is the responsibility of the AC’97 controller to probe more deeply into the AC‘97 CODEC’s register file to determine which subsections are actually ready (refer to section 6.3 for more information). IDT™ 35 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING STAC9766/9767 V 7.4 12/06 STAC9766/9767 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING PC AUDIO register index, for historical reference, for the data to be returned in slot 2. (Assuming that slots 1 and 2 had been tagged “valid” by the AC‘97 CODEC during slot 0. Table 9. Status Address Port Bit Assignments Bit Description Comments 19 18:12 Reserved Control Register Index 11:2 SLOTREQ See Next Section 1:0 Reserved Stuffed with 0 Stuffed with 0 Echo of register index for which data is being returned The first bit (MSB) generated by AC‘97 is always stuffed with a 0. The following 7 bit positions communicate the associated control register address, the next 10 bits support AC‘97’s variable sample rate signaling protocol, and the trailing 2 bit positions are stuffed with 0 by AC‘97. 5.4.2.2. SLOTREQ signaling bits AC-link input frame Slot 1, the Status Address Port, now delivers CODEC control register read address and variable sample rate slot request flags for all output slots. Ten of the formerly reserved least significant bits have been defined as data request flags for output slots 3-12. The AC-link input frame Slot 1 tag bit is independent of the bit 11-2 slot request field, and ONLY indicates valid Status Address Port data (Control Register Index). The CODEC should only set SDATA_IN tag bits for Slot 1 (Address) and Slot 2 (Data) to 1 when returning valid data from a previous register read. They should otherwise be set to 0. SLOTREQ bits have validity independent of the Slot 1 tag bit. SLOTREQ bits are always 0 in the following cases • Fixed rate mode (VRA = 0) • Inactive (powered down) ADC channel SLOTREQ bits are only set to 1 by the CODEC in the following case • 5.4.3. Variable rate audio mode (VRA = 1) AND active (power ready) ADC AND a non-48 KHz ADC sample rate and CODEC does not need a sample Slot 2: Status Data Port The status data port delivers 16-bit control register read data. Table 10. Status Data Port Bit Assignments Bit 19:4 Description Control Register Read Data 3:0 Reserved Comments Stuffed with 0 if tagged “invalid” Stuffed with 0 If Slot 2 is tagged invalid by AC‘97, then the entire slot will be stuffed with 0 by AC‘97. IDT™ 36 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING STAC9766/9767 V 7.4 12/06 STAC9766/9767 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING 5.4.4. PC AUDIO Slot 3: PCM Record Left Channel Audio input frame slot 3 is the left channel output of STAC9766/9767 input MUX, post-ADC. STAC9766/9767 ADCs are implemented to support 20-bit resolution. NOTE: The ADC can be assigned to slots 3&4, 6&9, 7&8, or 10&11. 5.4.5. Slot 4: PCM Record Right Channel Audio input frame slot 4 is the right channel output of STAC9766/9767 input MUX, post-ADC. STAC9766/9767 ADCs are implemented to support 20-bit resolution. NOTE: The ADC can be assigned to slots 3&4, 6&9, 7&8, or 10&11. 5.4.6. Slot 5: Modem Line 1 ADC Audio input frame slot 5 is not used by the STAC9766/9767 and is always stuffed with 0. 5.4.7. Slot 6-9: ADC The left and right ADC channels of the STAC9766/9767 may be assigned to slots 6&9 by Register 6Eh. NOTE: The ADC can be assigned to slots 3&4, 6&9, 7&8, or 10&11. 5.4.8. Slots 7-8: Vendor Reserved The left and right ADC channels of the STAC9766/9767 may be assigned to slots 7&8 by Register 6Eh. NOTE: The ADC can be assigned to slots 3&4, 6&9, 7&8, or 10&11. 5.4.9. Slot 10 & 11: ADC The left and right ADC channels of the STAC9766/9767 may be assigned to slots 10&11 by Register 6Eh. NOTE: The ADC can be assigned to slots 3&4, 6&9, 7&8, or 10&11. 5.4.10. Slot 12: Reserved AC-link input frame slot 12 contains the GPIO status inputs and allows for audio interrupts. Audio output frame slot 12 is Reserved for modem operations and is not used by the STAC9766/9767. IDT™ 37 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING STAC9766/9767 V 7.4 12/06 STAC9766/9767 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING 5.5. PC AUDIO AC-link Interoperability Requirements and Recommendations 5.5.1. “Atomic slot” Treatment of Slot 1 Address and Slot 2 Data Command or Status Address and Data cannot be split across multiple AC-link frames. The following transactions require that valid Slot 1 Address and valid Slot 2 Data be treated as “atomic” (inseparable) with Slot 0 Tag bits for Address and Data set accordingly (that is, both valid): 1. AC‘97 Digital Controller write commands to Primary CODECs 2. AC‘97 CODEC status responses Whenever the AC‘97 Digital Controller addresses a Primary CODEC or an AC‘97 CODEC responds to a read command, Slot 0 Tag bits should always be set to indicate actual Slot 1 and Slot 2 data validity. Table 11. Primary CODEC Addressing: Slot 0 Tag Bits Slot 0, bit 15 (Valid Frame) Slot 0, bit 14 (Valid Slot 1 Address) Slot 0, bit 13 (Valid Slot 2 Data) Slot 0, Bits 1-0 (CODEC ID) AC‘97 Digital Controller Primary Read Frame N, SDATA_OUT 1 1 0 00 AC‘97 Digital Controller Primary Write Frame N, SDATA_OUT 1 1 1 00 AC‘97 CODEC Status Frame N+1, SDATA_IN 1 1 1 00 Function When the AC‘97 Digital Controller addresses a Secondary CODEC, the Slot 0 Tag bits for Address and Data must be 0. A non-zero, 2-bit CODEC ID in the LSBs of Slot 0 indicates a valid Read or Write Address in Slot 1, and the Slot 1 R/W bit indicates presence or absence of valid data in Slot 2. Table 12. Secondary CODEC Addressing: Slot 0 tag bits IDT™ Function Slot 0, bit 15 (Valid Frame) Slot 0, bit 14 (Valid Slot 1 Address) Slot 0, bit 13 (Valid Slot 2 Data) Slot 0, Bits 1-0 (CODEC ID) AC‘97 Digital Controller Secondary Read Frame N, SDATA_OUT 1 0 0 01, 10, or 11 AC‘97 Digital Controller Secondary Write Frame N, SDATA_OUT 1 0 0 01, 10, or 11 AC‘97 CODEC Status Frame N+1, SDATA_IN 1 1 1 00 38 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING STAC9766/9767 V 7.4 12/06 STAC9766/9767 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING 5.6. PC AUDIO Slot Assignments for Audio Figure 19. Bi-directional AC-link Frame with Slot assignments SLOTS 0 1 2 3 4 5 6 7 TAG CMD ADDR CMD DATA PCM LEFT PCM RT NA PCM CTR TAG STATUS ADDR STATUS DATA PCM LEFT PCM RT LINE1 ADC PCM MIC 8 9 10 11 12 PCM LSURR PCM RSURR PCM LFE SPDIF SPDIF IO CTRL Vendor RSVD Vendor RSVD Vendor RSVD LINE2 ADC HSET ADC IO STATUS SYNC OUTGOING STREAMS (Controller output - SDATA_OUT) INCOMING STREAMS (codec output - SDATA_IN) TAG PHASE DATA PHASE Slot 12 can be used by the AC'97 Codec if a Modem Codec is not present. Note: The DAC & ADC can be assigned to slots 3&4, 6&9, 7&8, or 10&11. The AC-link input slots (transmitted to the Codec) are defined as follows: Table 13. AC-link Input Slots To CODEC Slot 0 1 2 3,4 Name SDATA_OUT TAG Description MSBs indicate which slots contain valid data; LSBs convey Codec ID Control CMD ADDR write port Read/write command bit plus 7-bit Codec register address Control DATA write port PCM L & R DAC playback 16-bit command register write data 16, 18, or 20-bit PCM data for left and right channels Modem Line 1 DAC 16-bit modem data for modem line 1 output PCM Center, Rear, LFE 16, 18, or 20-bit PCM data for Center, L & R Rear, LFE channels 10 Modem Line 2 DAC 16-bit modem data for modem line 2 output 11 12 Modem handset DAC Modem IO control 16-bit modem data for modem handset output GPIO write port for modem control 5 6, 7, 8, 9 10-12 Double rate audio Optional AC-link bandwidth for 88.2 or 96 kHz on L, C, R channels The AC-link input slots (transmitted from the Codec) are defined as follows: Table 14. AC-link Input Slots From CODEC Slot Description SDATA_IN TAG MSBs indicate which slots contain valid data 1 2 STATUS ADDR read port STATUS DATA read port MSBs echo register address; LSBs indicate which slots request data 16-bit command register read data PCM L & R ADC record 16-bit PCM data from left and right inputs Modem Line 1 ADC Dedicated Microphone ADC 16-bit modem data from modem line 1 input 16-bit PCM data from optional 3rd ADC input 3,4 5 6 IDT™ Name 0 39 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING STAC9766/9767 V 7.4 12/06 STAC9766/9767 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING PC AUDIO Table 14. AC-link Input Slots From CODEC Slot Name Description 7, 8, 9 Vendor reserved 10 Modem Line 2 ADC Vendor specific (enhanced input for docking, array mic, etc.) 16-bit modem data from modem line 2 input 11 Modem handset input 16-bit modem data for modem handset input 12 Modem IO status GPIO read port for modem control The AC-link output slots dedicated to audio are defined as follows: Table 15. AC-link Output Slots Dedicated To Audio Slot Name Description 3 4 PCM L DAC playback PCM R DAC playback 20-bit PCM data for left channel 20-bit PCM data for right channel 6 PCM Center 20-bit PCM data for Center channel 7 8 PCM L Surround PCM R Surround 20-bit PCM data for L Surround channel 20-bit PCM data for R Surround channel 9 PCM LFE 20-bit PCM data for LFE channel 10:11 12 SPDIF Out Reserved 20-bit SPDIF Output Reserved The AC-link input slots dedicated to audio are defined as follows: Table 16. AC-link Input Slots Dedicated To Audio Slot Name Description 3 PCM L ADC record 20-bit PCM data from left input 4 6 PCM R ADC record Dedicated Microphone ADC 20-bit PCM data from right inputs 20-bit PCM data from optional 3rd ADC input 7 Vendor reserved vendor specific (enhanced input for docking, array mic, etc.) 8 9 Vendor reserved Vendor reserved vendor specific (enhanced input for docking, array mic, etc.) vendor specific (enhanced input for docking, array mic, etc.) 12 Audio Interrupt Provides optional interrupt capability for Audio CODEC (not usable when a modem is present) Note: The ADC can be assigned to slots 3&4, 6&9, 7&8, or 10&11. Table 17. Audio Interrupt Slot Definitions Bit 19-1 0 IDT™ Description Reserved (Audio CODEC will return zeros in bits 19-1) Optional: Assertion = 1 will cause interrupt to be propagated to Audio controller system interrupt. See register 24h definition for enabling mechanism. 40 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING STAC9766/9767 V 7.4 12/06 STAC9766/9767 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING PC AUDIO 6. STAC9766/9767 MIXER 6.1. Mixer Description The STAC9766/9767 includes an analog mixer for maximum flexibility. The analog mixer is designed to the AC'97 specification to manage the playback and record of all digital and analog audio sources in the PC environment. The analog mixer also includes several extensions of the AC’97 specification to support “all analog record” capability as well as “POP BYPASS” mode for all digital playback. The analog sources include: • System Audio : Digital PCM input and output for business, games & multimedia • CD/DVD: Analog CD/DVD-ROM audio with internal connections to CODEC mixer • Stereo or Mono microphone: Choice of desktop mic, with programmable boost and gain • Speakerphone: Use of system mic and speakers for telephone, DSVD, and video conferencing • Video: TV tuner or video capture card with internal connections to CODEC mixer • AUX/Synth: Analog FM or wavetable synthesizer, or other internal source • Line in: External analog line level source from consumer audio, video camera, etc. Source IDT™ Function Connection PC_BEEP PHONE PC BEEP pass through to LINE_OUT MONO input From PC_BEEP output From telephony subsystem MIC1 Desktop microphone From stereo or mono mic jack MIC2 LINE_IN Second microphone External audio source From stereo or second mono mic jack From line-in jack CD Audio from CD-ROM Cable from CD-ROM VIDEO AUX Audio from TV tuner or video camera Upgrade synth or other external source Cable from TV or VidCap card Internal connector PCM out Digital audio output from AC'97 Controller AC-Link Destination HP_OUT Function Stereo mix of all sources Connection To headphone out jack LINE_OUT Stereo mix of all sources To output jack MONO_OUT PCM in Mic or MONO Analog mixer output Digital data from the CODEC to the AC'97 Controller To telephony subsystem AC-Link SPDIF SPDIF digital audio output To SPDIF output connector 41 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING STAC9766/9767 V 7.4 12/06 STAC9766/9767 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING 6.2. PC AUDIO Mixer Functional Diagrams Figure 20. STAC9766 2-Channel Mixer Functional Diagram KEY MonoAnalog 2Ah:D5-D4 Slot Select 28h: D5-D4 PCM to SPDIF MUX PCMOut StereoAnalog 6Ah:D1 Slot Select 20h:D13 22h:D2-D3 18h DAC vol 0Ah PC_BEEP 0Ch Phone 3D vol mute vol mute 0Eh:D6 & 6E:D2 MIC1 MIC2 0Eh 10, 20 or 30 dB 10h LINEIN 12h CD 16h AUX 14h mute vol mute vol mute vol mute vol mute Headphone Volume HP_OUT 02h Σ 20h:D13 22h:D2-D3 Σ 3D 20h:D15 Master Volume -6dB LINE_OUT 06h MUX Σ 6Eh:D12 AllAnalog vs AllRecord Mono Volume MONO_OUT 1Ah -6dB Σ 20h:D9 1Ch MUX VIDEO vol 04h Digital PCBeep MUX Analog Audio Sources mute MUX 20h:D8 Digital SPDIF Record Volume 38h:D5-D4 ADC Slot Select PCMIn ADCRecord Figure 21. STAC9767 2-Channel Mixer Functional Diagram KEY MonoAnalog 2Ah:D5-D4 Slot Select 28h: D5-D4 PCM to SPDIF MUX PCMOut StereoAnalog 6Ah:D1 Slot Select 20h:D13 22h:D2-D3 18h DAC 0Ah PC_BEEP 0Ch Phone Analog Audio LINEIN CD AUX vol mute vol mute 0Eh:D6 & 6E:D2 10, 20 or 30 dB 0Eh 10h 12h 16h 14h vol mute vol mute vol mute vol mute vol mute 04h Digital PCBeep Headphone Volume HP_OUT 02h Σ 20h:D13 22h:D2-D3 3D Σ 20h:D15 Master Volume -6dB LINE_OUT 06h MUX Σ 6Eh:D12 AllAnalog vs AllRecord Mono Volume MONO_OUT 1Ah -6dB Σ 20h:D9 1Ch MUX VIDEO 3D MUX Sources mute MUX 20h:D8 MIC1 MIC2 vol Digital SPDIF Record Volume 38h:D5-D4 ADC Slot Select PCMIn ADCRecord IDT™ 42 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING STAC9766/9767 V 7.4 12/06 STAC9766/9767 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING 6.3. PC AUDIO Mixer Analog Input The mixer provides recording and playback of any audio sources or output mix of all sources. The STAC9766/9767 supports the following input sources: • Any mono or stereo source • Mono or stereo mix of all sources • Two-channel input with mono output reference (mic or stereo mix) Note: All unused inputs should be tied together and connected to ground through a capacitor (0.1 µF suggested). Note: The MIC should be tied to ground separately through its own 0.1 µf capacitor. 6.4. Mixer Analog Output The Mixer generates three distinct outputs: IDT™ • A stereo mix of all sources for output to the LINE_OUT • A stereo mix of all sources for output to HP_OUT • A mono, mic only or mix of all sources for MONO_OUT 43 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING STAC9766/9767 V 7.4 12/06 STAC9766/9767 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING PC AUDIO 7. SPDIF AND PC BEEP 7.1. SPDIF Digital Mux The STAC9766/9767 incorporates a digital output that supports SPDIF formats. A multiplexer determines which of two digital input streams are used for the digital output conversion process. These two streams include the PCM OUT data from the audio controller and the ADC recorded output. The normal analog LINE_OUT signal can be converted to the SPDIF formats by using the internal ADC to record the “MIX” output, which is the combination of all analog and all digital sources. In the case of digital controllers with support for four or more channels, the SPDIF output mode can be used to support compressed 6-channel output streams for delivery to home theater systems. These can be routed on alternate AC-Link slots to the SPDIF output, while the standard 2-channel output is delivered as selected by bits D5 and D4 in Register 6E. If the digital controller supports 6 channels, a SPDIF output with four analog channels can also be configured. If the Digital Controller has independent DMA engines, SPDIF and Analog can be used simultaneously and independently. 7.2. PC Beep Implementation The STAC9766/9767 offers two styles of PC BEEP, Analog and Digital. The digital PC Beep is a new feature added to the AC’97 Specification Rev 2.3. This style of PC Beep will eventually replace the Analog style, thus eliminating the need for a PC Beep pin. Until this feature is widely accepted, IDT will provide BOTH styles of PC Beep. Both PC Beep styles use Reg 0Ah. Additional information about Reg0Ah can be found in Section8.1.5: page50. 7.2.1. Analog PC Beep PC Beep is active on power up and defaults to an un-muted state. The PC-BEEP input is routed directly to the MONO_OUT, LINE_OUT and HP_OUT pins of the CODEC. Because the PC_BEEP input drive is often a full scale digital signal, some resistive attenuation of the PC_BEEP input is recommended to keep the beep tone within reasonable volume levels. The user should mute this input before using any other mixer input because the PC Beep input can contribute noise to the lineout during normal operation. This style of PC Beep is related to the AC’97 Specification Rev 2.2. To use the analog PC Beep, write a value of 00h to bits F[7:0](D[12:5]) to disable generation of the Digital PC Beep. PV[3:0] (D[4:1]) controls the volume level from 0dB to 45dB of attenuation in 3dB steps. 7.2.2. Digital PC Beep The Digital PC Beep uses the identical register as the Analog style, Reg 0Ah. This register controls the level and frequency for the PC Beep. The beep frequency is the result of dividing the 48 KHz clock by 4 times the number specified in F[7:0], allowing tones from 47Hz to 12 KHz. A value of 00h written to bits F[7:0] disables the digital PC Beep generation and enables the analog style PC Beep. The volume control bits, PV[3:0] operate identically to the analog PC Beep mode. Applying a signal to the PC Beep pin, pin 12, may cause the digital PC Beep signal to become distorted or inaudible. When using the digital PC Beep feature, leave the PC Beep input pin unconnected or connected to analog ground through a capacitor. Connecting a capacitor from the PC Beep input pin to ground will create a more pleasing sound by changing the digital output to a more sinusoidal output. IDT™ 44 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING STAC9766/9767 V 7.4 12/06 STAC9766/9767 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING PC AUDIO Table 18. Digital PC Beep Examples Value Reg 0Ah Frequency 1 0x01 12,000Hz 10 25 0x0A 0x19 1200Hz 480Hz 50 0x32 240Hz 100 127 0x64 0x0F 120Hz 94.48Hz 255 0xFF 47.05Hz This will be programmed directly by the BIOS. IDT™ 45 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING STAC9766/9767 V 7.4 12/06 STAC9766/9767 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING PC AUDIO 8. PROGRAMMING REGISTERS Table 19. Programming Registers Address 00h Default 6A90h Location 8.1.1; page47 02h Master Volume 8000h 8.1.2; page48 04h 06h HP_OUT Mixer Volume Master Volume MONO 8000h 8000h 8.1.3; page48 8.1.4; page49 0Ah PC Beep Mixer Volume 0000h 8.1.5; page50 0Ch 0Eh Phone Mixer Volume Mic Mixer Volume 8008h 8008h 8.1.6; page50 8.1.7; page51 10h Line In Mixer Volume 8808h 8.1.8; page51 12h 14h CD Mixer Volume Video Mixer Volume 8808h 8808h 8.1.9; page52 8.1.10; page53 16h Aux Mixer Volume 8808h 8.1.11; page53 18h 1Ah PCM Out Mixer Volume Record Select 8808h 0000h 8.1.12; page54 8.1.13; page54 1Ch Record Gain 8000h 8.1.14; page55 20h 22h General Purpose 3D Control 0000h 0000h 8.1.15; page56 8.1.16; page56 24h Audio Int. & Paging 0000h 8.1.17: page57 26h 28h Powerdown Ctrl/Stat Extended Audio ID 000Fh 0A05h 8.1.18; page58 8.1.19; page59 2Ah Extended Audio Control/Status 0400h* 8.1.20; page60 2Ch 32h PCM DAC Rate PCM LR ADC Rate BB80h BB80h 8.1.22; page63 8.1.23; page63 3Ah SPDIF Control 2000h 8.1.24; page64 3Eh 4Ch Extended Modem Stat/Ctrl GPIO Pin Configuration 0100h 0003h 8.2.4; page66 8.2.5; page66 4Eh GPIO Pin Polarity/Type FFFFh 8.2.6; page66 50h 52h GPIO Pin Sticky GPIO Wake-up 0000h 0000h 8.2.7; page67 8.2.8; page67 54h GPIO Pin Status 0000h 8.2.9; page67 60h CODEC Class/Rev 62h (Page 01h) PCI SVID 1201h FFFFh 8.3; page68 8.4.2; page70 64h (Page 01h) PCI SSID FFFFh 8.4.3; page70 66h (Page 01h) Function Select 68h (Page 01h) Function Information 0000h xxxxh 8.4.4; page71 8.4.5; page72 0000h 8.4.6; page74 6Ah (Page01h) Sense Details 6Ch Revision Code NA xxxxh 8.4.7: page74 8.4.7; page74 6Ch (Page01h) Reserved 0000h NA 1000h 8.4.9: page76 6Ah 6Eh IDT™ Name Reset Digital Audio Control Analog Special 46 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING STAC9766/9767 V 7.4 12/06 STAC9766/9767 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING PC AUDIO Table 19. Programming Registers Address Name 6Eh (Page01h) Reserved Default Location 0000h NA 70h 72h Enable Register Analog Current Adjust 0000h 0000h NA 8.4.10; page77 74h EAPD Access 0800h 8.4.11; page78 78h 7Ah High Pass Filter Bypass Reserved 0000h NA 8.4.12; page79 NA 7Ch Vendor ID1 8384h 8.5.1; page80 7Eh Vendor ID2 7652h 8.5.2; page80 Note: * depends upon CODECID 8.1. Register Descriptions 8.1.1. Reset (00h) Default: 6A90h D15 D14 D13 D12 D11 D10 D9 D8 RSRVD D7 SE4 D6 SE3 D5 SE2 D4 SE1 D3 SE0 D2 ID9 D1 ID8 D0 ID7 ID6 ID5 ID4 ID3 ID2 ID1 ID0 Writing any value to this register performs a register reset, which causes all registers to revert to their default values. This register reset also resets all the digital block. Reading this register returns the ID code of the part. Bit(s) 15 14:10 9 8 7 6 5 4 3 2 1 0 IDT™ Reset Value 0 11010 1 0 1 0 0 1 0 0 0 0 Name RESERVED SE4:SE0 ID9 ID8 ID7 ID6 ID5 ID4 ID3 ID2 ID1 ID0 Description Bit not used, should read back 0 IDT ID for SS3D 20 bit ADC resolution (supported) 18 bit ADC resolution 20 bit DAC resolution (supported) 18 bit DAC resolution Loudness (bass boost) Headphone out (supported) Simulated stereo (mono to stereo) Bass & treble control Reserved Dedicated MIC PCM in channel 47 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING STAC9766/9767 V 7.4 12/06 STAC9766/9767 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING 8.1.2. PC AUDIO Master Volume Registers (02h) Default: 8000h D15 D14 D13 D12 D11 D10 D9 D8 Mute D7 RSRVD D6 ML5 D5 ML4 D4 ML3 D3 ML2 D2 ML1 D1 ML0 D0 MR5 MR4 MR3 MR2 MR1 MR0 RESERVED Bit(s) Reset Value Name 15 1 Mute 14 0 RESERVED 13 0 ML5 12:8 0 ML 7:6 0 RESERVED 5 0 MR5 4:0 0 MR 8.1.3. Description 0 = no mute 1 = Mutes both left & right channels Bit not used, should read back 0 0 = Lineout attenuation is a function of bits12-8 1 = Forces register bits 12-8 to be 11111 Always reads back 0 Left Lineout Volume Control 00000 = 0dB attenuation 00001 = 1.5dB attenuation ..... 11111 = 46.5dB attenuation Bits not used, should read back 0 0 = Lineout attenuation is a function of bits 4-0 1 = Forces register bits 4-0 to be 11111 Always reads back 0 Right Channel Lineout Volume Control 00000 = 0dB attenuation 00001 = 1.5dB attenuation ..... 11111 = 46.5dB attenuation Headphone Volume Registers (04h) Default: 8000h D15 D14 D13 D12 D11 D10 D9 D8 Mute RSRVD HPL5 HPL4 HPL3 HPL2 HPL1 HPL0 D5 HPR5 D4 HPR4 D3 HPR3 D2 HPR2 D1 HPR1 D0 HPR0 D7 D6 RESERVED IDT™ Bit(s) Reset Value Name 15 1 Mute 14 0 RESERVED 13 0 ML5 Description 0 = no mute 1 = Mutes both left & right channels Bit not used, should read back 0 0 = Headphone attenuation is a function of bits12-8 1 = forces register bits 12-8 to be 11111 Always reads back 0 48 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING STAC9766/9767 V 7.4 12/06 STAC9766/9767 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING Bit(s) Reset Value Name 12:8 0 ML 7:6 0 RESERVED 5 0 MR5 4:0 0 MR 8.1.4. PC AUDIO Description Left Headphone Volume Control 00000 = 0dB attenuation 00001 = 1.5dB attenuation ..... 11111 = 46.5dB attenuation Bits not used, should read back 0 0 = Headphone attenuation is a function of bits 4-0 1 = forces register bits 4-0 to be 11111 Always reads back 0 Right Channel Headphone Volume Control 00000 = 0dB attenuation 00001 = 1.5dB attenuation ..... 11111 = 46.5dB attenuation Master Volume MONO (06h) Default: 8000h D15 D14 D13 D12 Mute D7 D6 RESERVED IDT™ D11 D10 D9 D8 D2 MM2 D1 MM1 D0 MM0 RESERVED D5 MM5 Bit(s) Reset Value Name 15 1 Mute 14:6 0 RESERVED 5 0 MM5 4:0 0 MM D4 MM4 D3 MM3 Description 0 = No mute 1 = Mute mono Bit not used, should read back 0 0 = Mono attenuation is a function of bits 4-0 1 = Forces register bits 4-0 to be 11111 Always reads back 0 Mono Volume Control 00000 = 0dB attenuation 00001 = 1.5dB attenuation ..... 11111 = 46.5dB attenuation 49 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING STAC9766/9767 V 7.4 12/06 STAC9766/9767 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING 8.1.5. PC AUDIO PC BEEP Volume (0Ah) Default: 0000h Additional information on the PC Beep can be found in Section 7.2: page44. D15 D14 Mute D7 D13 RESERVED D6 D5 F2 F1 F0 Bit(s) Reset Value Name 15 1 Mute 14:13 0 RESERVED 12:5 00h F[7:0] 4:1 0 PV(3:0) 0 0 RESERVED 8.1.6. D12 D11 D10 D9 D8 F7 D4 F6 D3 F5 D2 F4 D1 F3 D0 PV3 PV2 PV1 PV0 RSRVD Description 0 = No mute 1 = Mute PC BEEP Bit not used, should read back 0 The Beep frequency is the result of dividing the 48KHz clock by 4 times the number specified in F[7:0] allowing tones from 47Hz to 12KHz. A value of 00h in bits F[7:0] disables internal PC BEEP generation and enables external PC BEEP input if available. PCBEEP Volume Control 0000 = 0dB attenuation 0001 = 3dB attenuation ..... 1111 = 45dB attenuation Bit not used, should read back 0 Phone Volume (Index 0Ch) Default: 8008h. D15 D14 Mute D7 D13 D6 D5 RESERVED IDT™ Bit(s) Reset Value Name 15 1 Mute 14:5 0 RESERVED 4:0 0 GN D12 D11 D4 RESERVED D3 D10 D9 D8 D2 D1 D0 GN4 GN3 GN2 GN1 GN0 Description 0 = No mute 1 = Mute phone Bit not used, should read back 0 Phone Volume Control 00000 = 12dB gain 00001 = 10.5dB gain ..... 01000 = 0dB gain ..... 11111 = -34.5dB gain 50 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING STAC9766/9767 V 7.4 12/06 STAC9766/9767 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING 8.1.7. PC AUDIO Stereo or Mic Volume (Index 0Eh) To enable Stereo Mic, Register 78h (unlocked), bit D6 must be enabled. In Stereo mode, the left and right volume are controlled by GN4:GN0. Default: 8008h. D15 Mute D14 D13 D12 D11 RESERVED D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 RESERVED BOOSTEN RESERVED GN4 GN3 GN2 GN1 GN0 Bit(s) Reset Value Name 15 1 Mute 14:7 0 RESERVED 6 0 BOOSTEN 5 0 RESERVED 4:0 8.1.8. 0 GN Description 0 = no mute 1 = mute phone Bit not used, should read back 0 Works with MICGAINVAL (Register 6Eh Bit D2) BOOSTEN MICGAINVAL = Mic Gain Boost 0 0 = 0 dB 0 1 = 10 dB 1 0 = 20 dB 1 1 = 30 dB Phone Volume Control 00000 = 12dB gain 00001 = 10.5dB gain ..... 01000 = 0dB gain ..... 11111 = -34.5dB gain LineIn Volume (Index 10h) Default: 8808h. D15 D14 Mute D7 D13 D12 D11 D10 D9 D8 RESERVED D6 D5 GL4 D4 GL3 D3 GL2 D2 GL1 D1 GR0 D0 GR4 GR3 GR2 GR1 GR0 RESERVED IDT™ Bit(s) Reset Value Name 15 1 Mute 14:13 0 RESERVED 12:8 0 GL Description 0 = No mute 1 = Mute linein Bit not used, should read back 0 Left LineIn Volume Control 00000 = 12dB gain 00001 = 10.5dB gain ..... 01000 = 0dB gain ..... 11111 = -34.5dB gain 51 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING STAC9766/9767 V 7.4 12/06 STAC9766/9767 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING Bit(s) 7:5 Reset Value 0 Name RESERVED 4:0 0 GR 8.1.9. PC AUDIO Description Bit not used, should read back 0 Right LineIn Volume Control 00000 = 12dB gain 00001 = 10.5dB gain ..... 01000 = 0dB gain ..... 11111 = -34.5dB gain CD Volume (Index 12h) Default: 8808h. D15 D14 Mute D7 D13 D12 D11 D10 D9 D8 RESERVED D6 D5 GL4 D4 GL3 D3 GL2 D2 GL1 D1 GR0 D0 GR4 GR3 GR2 GR1 GR0 RESERVED IDT™ Bit(s) Reset Value Name 15 1 Mute 14:13 0 RESERVED 12:8 0 GL 7:5 0 RESERVED 4:0 0 GR Description 0 = No mute 1 = Mute CD Bit not used, should read back 0 Left CD Volume Control 00000 = 12dB gain 00001 = 10.5dB gain ..... 01000 = 0dB gain ..... 11111 = -34.5dB gain Bit not used, should read back 0 right CD Volume Control 00000 = 12dB gain 00001 = 10.5dB gain ..... 01000 = 0dB gain ..... 11111 = -34.5dB gain 52 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING STAC9766/9767 V 7.4 12/06 STAC9766/9767 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING 8.1.10. PC AUDIO Video Volume (Index 14h) Default: 8808h. D15 D14 Mute D7 D13 D12 D11 D10 D9 D8 RESERVED D6 D5 GL4 D4 GL3 D3 GL2 D2 GL1 D1 GR0 D0 GR4 GR3 GR2 GR1 GR0 D9 GL1 D8 GR0 RESERVED Bit(s) Reset Value Name 15 1 Mute 14:13 0 RESERVED 12:8 0 GL 7:5 0 RESERVED 4:0 0 GR 8.1.11. Description 0 = No mute 1 = Mute video Bit not used, should read back 0 Left Video Volume Control 00000 = 12dB gain 00001 = 10.5dB gain ..... 01000 = 0dB gain ..... 11111 = -34.5dB gain Bit not used, should read back 0 Right video Volume Control 00000 = 12dB gain 00001 = 10.5dB gain ..... 01000 = 0dB gain ..... 11111 = -34.5dB gain Aux Volume (Index 16h) Default: 8808h. D15 Mute D14 D13 RESERVED D7 D6 D5 RESERVED IDT™ Bit(s) Reset Value Name 15 1 Mute 14:13 0 RESERVED 12:8 0 GL D12 GL4 D11 GL3 D10 GL2 D4 D3 D2 D1 D0 GR4 GR3 GR2 GR1 GR0 Description 0 = No mute 1 = Mute aux Bit not used, should read back 0 Left Aux Volume Control 00000 = 12dB gain 00001 = 10.5dB gain ..... 01000 = 0dB gain ..... 11111 = -34.5dB gain 53 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING STAC9766/9767 V 7.4 12/06 STAC9766/9767 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING Bit(s) 7:5 Reset Value 0 Name RESERVED 4:0 0 GR 8.1.12. PC AUDIO Description Bit not used, should read back 0 Right Aux Volume Control 00000 = 12dB gain 00001 = 10.5dB gain ..... 01000 = 0dB gain ..... 11111 = -34.5dB gain PCMOut Volume (Index 18h) Default: 8808h. D15 Mute D14 D13 RESERVED D7 D6 D5 RESERVED Bit(s) Reset Value Name 15 1 Mute 14:13 0 RESERVED 12:8 0 GL 7:5 0 RESERVED 4:0 0 GR 8.1.13. D12 GL4 D11 GL3 D10 GL2 D9 GL1 D8 GR0 D4 D3 D2 D1 D0 GR4 GR3 GR2 GR1 GR0 D10 D9 D8 SL2 SL1 SL0 D2 SR2 D1 SR1 D0 SR0 Description 0 = No mute 1 = Mute PCM out Bit not used, should read back 0 Left PCM Volume Control 00000 = 12dB gain 00001 = 10.5dB gain ..... 01000 = 0dB gain ..... 11111 = -34.5dB gain Bit not used, should read back 0 Right PCM Volume Control 00000 = 12dB gain 00001 = 10.5dB gain ..... 01000 = 0dB gain ..... 11111 = -34.5dB gain Record Select (1Ah) Default: 0000h (corresponding to Mic in) Used to select the record source independently for right and left. D15 D14 D7 D6 D13 D12 D11 D4 D3 RESERVED IDT™ D5 RESERVED 54 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING STAC9766/9767 V 7.4 12/06 STAC9766/9767 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING Bit(s) 15:11 Reset Value 0 Name RESERVED 10:8 0 SL2:SL0 7:3 0 RESERVED 2:0 0 SR2:SR0 8.1.14. PC AUDIO Description Bits not used, should read back 0 Left Channel Input Select 000 = Mic 001 = CD In (left) 010 = Video In (left) 011 = Aux In (left) 100 = Line In (left) 101 = Stereo Mix (left) 110 = Mono Mix 111 = Phone Bits not used, should read back 0 Right Channel Input Select 000 = Mic 001 = CD In (right) 010 = Video In (right) 011 = Aux In (right) 100 = Line In (right) 101 = Stereo Mix (right) 110 = Mono Mix 111 = Phone Record Gain (1Ch) Default: 8000h (corresponding to 0 dB gain with mute on) D15 Mute D14 D13 RESERVED D12 D11 GL3 D10 GL2 D9 GL1 D8 GL0 D7 D6 D5 D4 D3 D2 D1 D0 GR3 GR2 GR1 GR0 RESERVED IDT™ Bit(s) 15 14:12 Reset Value 1 0 Name MUTE RESERVED 11:8 0 GL 7:4 0 RESERVED 3:0 0 GR Description Mutes Record Gain Bits not used, should read back 0 Left Channel Volume Control 0000 = 0dB gain 0001 = 1.5dB gain .... 1111 = 22.5dB gain Bits not used, should read back 0 Right Channel Volume Control 0000 = 0dB gain 0001 = 1.5dB gain .... 1111 = 22.5dB gain 55 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING STAC9766/9767 V 7.4 12/06 STAC9766/9767 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING 8.1.15. PC AUDIO General Purpose (20h) Default: 0000h D15 D14 D13 POP BYP D7 RESERVED D6 3D D5 D12 D11 D4 RESERVED D3 LOOPBACK D9 D8 D2 MIX D1 MS D0 RESERVED Bit(s) Reset Value Name 15 0 POP BYPASS 14 0 RESERVED 13 0 3D 12:10 9 8 0 0 0 RESERVED MIX MS 7 0 LOOPBACK 6:0 0 RESERVED 8.1.16. D10 Description 0 = Normal 1 = DAC bypasses mixer and connects directly to Line Out, Headphone Out and Mono Out. Bit not used, should read back 0 0 = 3D Effect Disabled 1 = 3D Effect Enabled Bit not used, should read back 0 Mono Output select (0 = Mix, 1 = Mic) Mic select (0 = Mic1, 1 = Mic2) 1 = Enables ADC to DAC loopback test 0 = Loopback Disabled Do not send in conflicting data on AC-LINK while running this. Bit not used, should read back 0 3D Control (22h) Default: 0000h D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 RESERVED D4 D3 D2 D1 D0 RESERVED Bit(s) 15:4 Reset Value 0 Name RESERVED 3:2 0 DP3,DP2 1:0 0 RESERVED DP3 DP2 RESERVED Description Bits not used, should read back 0 LINE_OUT SEPARATION RATIO DP3 DP2 effect 0 0 0 ( OFF ) 0 1 3 ( LOW ) 1 0 4.5 ( MED ) 1 1 6 ( HIGH ) Bits not used, should read back 0 This register is used to control the 3D stereo enhancement function, IDT Surround 3D (SS3D), built into the AC'97 component. Note that register bits DP3-DP2 are used to control the separation ratios in the 3D control for LINE_OUT. SS3D provides for a wider soundstage extending beyond the normal 2-speaker arrangement. Note that the 3D bit in the general purpose register (20h) must be set to 1 to enable SS3D functionality to allow the bits in 22h to take effect. IDT™ 56 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING STAC9766/9767 V 7.4 12/06 STAC9766/9767 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING PC AUDIO The three separation ratios are implemented. The separation ratio defines a series of equations that determine the amount of depth difference (High, Medium, and Low) perceived during two-channel playback. The ratios provide for options to narrow or widen the soundstage. 8.1.17. Audio Interrupt and Paging (24h) Default: 0000h D15 D14 D13 D12 D11 D10 D9 D8 I4 D7 I3 D6 I2 D5 I1 D4 I0 D3 D2 RESERVED D1 D0 PG3 PG2 PG1 PG0 RESERVED Bit(s) Reset Value IDT™ Access Name 15 0 Read / Write I4 14-13 0 Read Only I3-I2 12 0 Read / Write I1 11 0 Read / Write I0 Description 0 = Interrupt is clear 1 = Interrupt is set Interrupt event is cleared by writing a 1 to this bit. The interrupt bit will change regardless of condition of interrupt enable (I0) status. An interrupt in the GPI in slot 12 in the ACLink will follow this bit change when interrupt enable (I0) is unmasked. Interrupt Cause 00 = Reserved 01 = Sense cycle complete, sense info available. 10 = Change in GPIO input status 11 = Sense cycle complete and change in GPIO input status. These bits will reflect the general cause of the first interrupt event generated. It should be read after interrupt status has been confirmed as interrupting. The information should be used to scan possible interrupting events in proper pages. Sense Cycle 0 = Sense Cycle not in Progress 1 = Sense Cycle Start. Writing a 1 to this bit causes a sense-cycle start, if supported. If sense cycle is not supported, this bit is read only. Interrupt Enable 0 = Interrupt generation is masked. 1 = Interrupt generation is un-masked. The driver should not un-mask the interrupt unless ensured by the AC‘97 controller that no conflict is possible with modem slot 12 GPI functionality. Some AC’97 2.2 compliant controllers will not likely support audio CODEC interrupt infrastructure. In either case, software should poll the interrupt status after initiating a sense cycle and wait for Sense Cycle Max Delay to determine if an interrupting event has occurred. 57 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING STAC9766/9767 V 7.4 12/06 STAC9766/9767 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING Bit(s) Reset Value 10:4 0 3:0 0 PC AUDIO Access Read Only Name Description RESERVED Bits not used, should read back 0 Page Selector 0h = Vendor Specific 1h = Page ID 01 (See Section 8.4 for additional information on the Paging Registers) Fh = Reserved Pages This register is used to select a descriptor of 16 word pages between registers 60h to 6Fh. Value 0h is used to select vendor Read / Write PG3:PG0 specific space to maintain compatibility with AC’97 2.2 vendor specific registers. System software determines implemented pages by writing the page number and reading the value back. All implemented pages must be consecutive. (i.e., page 2h cannot be implemented without page 1h). These registers are not reset on RESET#. 8.1.18. Powerdown Ctrl/Stat (26h) Default: 000Fh D15 D14 D13 D12 D11 D10 D9 D8 EAPD D7 PR6 D6 PR5 D5 PR4 D4 PR3 D3 PR2 D2 PR1 D1 PR0 D0 REF ANL DAC ADC RESERVED IDT™ Bit(s) Reset Value Name 15 0 EAPD 14 0 PR6 13 0 PR5 12 0 PR4 11 0 PR3 10 0 PR2 9 0 PR1 8 0 PR0 7:4 0 RESERVED 3 1 REF 2 1 ANL Description 1 = Forces EAPD pad to VDDD 0 = Forces EAPD pad to GNDD 0 = Headphone Amp powered up 1 = Headphone Amp powered down 0 = Digital Clk active 1 = Digital Clk disable 0 = Digital active 1 = Powerdown: PLL, AC-Link, crystal oscillator 0 = VREF and VREFOUT are active 1 = VREF and VREFOUT are powered down, and PR2 is asserted in analog block 0 = Analog active 1 = All signal path analog is powered down 0 = DAC powered up 1 = DAC powered down 0 = ADC powered up 1 = ADC powered down Bit not used, should read back 0 Read Only --- VREF status 1 = VREF enabled Read Only ---- ANALOG MIXERS, etc. Status 1 = Analog mixers ready. 58 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING STAC9766/9767 V 7.4 12/06 STAC9766/9767 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING Bit(s) Reset Value Name 1 1 DAC 0 1 ADC 8.1.18.1. PC AUDIO Description Read Only ---- DAC Status 1 = DAC ready to playback Read Only ---- ADC Status 1 = ADC ready to record Ready Status The lower half of this register is read only status, a 1 indicating that each subsection is “ready”. Ready is defined as the subsection's ability to perform in its nominal state. When this register is written, the bit values that come in on AC-Link will have no effect on read only bits 0-7. When the AC-Link “CODEC Ready” indicator bit (SDATA_IN slot 0, bit 15) is a 1, it indicates that the AC-Link and AC'97 control and status registers are in a fully operational state. The AC'97 controller must further probe this Powerdown Control/Status Register to determine exactly which subsections, if any, are ready. When this register is written, the bit values that come in on AC-Link will have no effect on read only bits 0-7. 8.1.18.2. Powerdown Controls The STAC9766/9767 is capable of operating at reduced power when no activity is required. The power-down state is controlled by the Powerdown Register (26h). See the section “Low Power Modes” for more information. 8.1.18.3. External Amplifier Power Down Control Output The EAPD bit 15 of the Powerdown Control/Status Register (Index 26h) directly controls the output of the EAPD output, pin 45, and produces a logical 1 when this bit is set to logic high. This function is used to control an external audio amplifier power down. EAPD = 0 places approximately 0 V on the output pin, enabling an external audio amplifier. EAPD = 1 places approximately DVdd on the output pin, disabling the external audio amplifier. Audio amplifiers that operate with reverse polarity will likely require an external inverter to maintain software driver compatibility. EAPD can also act as a GPIO. See Section 8.4.11: page78. The GPIO controls in Section 8.2: page65 have no effect on EAPD. 8.1.19. Extended Audio ID (28h) Default: 0A05h D15 D14 ID1 ID0 D7 D6 RESERVED D13 D12 D11 D10 RESERVED D5 DSA1 D4 DSA0 D3 RESVD D2 SPDIF D9 D8 AMAP RSVD D1 RSVD D0 VRA The Extended Audio ID register is a read only register except for bits D4 and D5. ID1 and ID0 echo the configuration of the CODEC as defined by the programming of pins 45 and 46 externally. The primary CODEC returns 00, while any other code (01, 10, 11) identifies the CODEC as one of three secondary CODEC possibilities. The AMAP bit, D9, will return a 1 indicating that the CODEC sup- IDT™ 59 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING STAC9766/9767 V 7.4 12/06 STAC9766/9767 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING PC AUDIO ports the optional “AC’97 2.3 compliant AC-link slot to audio DAC mappings”.The default condition assumes that 0, 0 are loaded in the DSA0 and DSA1 bits of the Extended Audio ID (Index 28h). With 0s in the DSA1 and DSA0 bits, the CODEC slot assignments are as per the AC’97 specification recommendations. If the DSA1 and DSA0 bits do not contain 0s, the slot assignments are as per the table in the section describing the Extended Audio ID (Index 28h). The VRA bit, D0, will return a 1 indicating that the CODEC supports the optional variable sample rate conversion as defined by the AC’97 specification. Table 20. Extended Audio ID Register Functions Bit Name Access Reset Value Function 00 = XTAL_OUT grounded (Note 1) CID1#,CID0# = XTAL_OUT crystal or floating 15:14 ID [1,0] Read only Variable 13:12 RESERVED Read only 00 Bits not used, should read back 00 11:10 9:6 REV[1:0] RSVD Read only Read only 10 0 Indicates CODEC is AC’97 Rev 2.3 compliant Reserved DAC slot assignment 5:4 8.1.20. DSA [1,0] Read/Write 00 Read only 0 If CID[1:0] = 00 then DSA[1:0] resets to 00 If CID[1:0] = 01 then DSA[1:0] resets to 01 If CID[1:0] = 10 then DSA[1:0] resets to 01 If CID[1:0] = 11 then DSA[1:0] resets to 10 00 = left slot 3, right slot 4 01 = left slot 7, right slot 8 10 = left slot 6, right slot 9 11 = left slot 10, right slot 11 Reserved 3 RSVD 2 SPDIF 1 RSVD Read only 0 0 = SPDIF pulled high on reset, SPDIF disabled 1 = default, SPDIF enabled (Note 2) Reserved 0 VRA Read only 1 Variable sample rates supported (Always = 1) Read only 1 1. External CID pin status (from analog) these bits are the logical inversion of the pin polarity (pin 45-46). These bits are zero if XTAL_OUT is grounded with an alternate external clock source in primary mode only. Secondary mode can either be through BIT CLK driven or 24MHz clock driver, with XTAL_OUT floating. 2. If pin 48 is held high at powerup, this bit will be held to zero, to indicate the SPDIF is not available. Pin 48: To Enable SPDIF, use a 1KΩ - 1 0 KΩ external pulldown. To Disable SPDIF, use a 1 KΩ - 1 0 KΩ external pullup. Do NOT leave Pin 48 floating. Extended Audio Control/Status (2Ah) Default: 0400h* (*default depends on CODEC ID) D15 D14 VCFG D7 D6 RESERVED IDT™ D13 D12 RESERVED D5 D4 SPSA1 SPSA0 D11 D10 D3 SPCV D2 RSRVD SPDIF 60 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING STAC9766/9767 D9 D8 RESERVED D1 D0 RSRVD VRA enable V 7.4 12/06 STAC9766/9767 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING PC AUDIO Note: If pin 48 is held high at powerup, the SPDIF is not available and bits D15:D1 can not be written and will read back zero. Pin 48: To Enable SPDIF, use a 1KΩ - 1 0 KΩ external pulldown. To Disable SPDIF, use a 1KΩ - 1 0 KΩ external pullup. Do NOT leave Pin 48 floating. Bit(s) Reset Value Name 15 VCFG 14-11 RESERVED 10 0 SPCV 9:6 0 RESERVED 5:4 0 3 If CID[1:0] = 00 then SPSA[1:0] resets to 01 If CID[1:0] = 01 then SPSA[1:0] resets to 10 If CID[1:0] = 10 then SPSA[1:0] resets to 10 SPSA1:SPSA0 If CID[1:0] = 11 then SPSA[1:0] resets to 11 RESERVED 2 0 SPDIF 1 0 RESERVED 0 0 VRA Enable 8.1.20.1. Description Determines the SPDIF transmitter behavior when data is not being transmitted. When asserted, this bit forces the deassertion of the SPDIF “Validity” flag, which is bit 28 transmitted by the SPDIF sub-frame. The “V” bit is defined in the SPDIF Control Register (Reg 3Ah). If “V” = 1 and “VCFG” = 0, then for each S/PDIF sub-frame (Left & Right), bit “Validity” flag reflects whether or not an internal CODEC transmission error has occurred. Specifically an internal CODEC error should result in the “Validity” flag being set to 1. If “V” = 0 and “VCFG” = 1, In the case where the S/PDIF transmitter does not receive a valid sample from the AC'97 controller, (Left or Right), the S/ PDIF transmitter should set the “Validity” flag to 0 and pad the “Audio Sample Word” with 0 for sub-frame in question. If a valid sample (Left or Right) was received and successfully transmitted, the “Validity” flag should be 0 for that sub-frame. Default state, coming out of reset, for “V” and “VCFG” should be 0 and 0. These bits are set via driver .inf options. Reserved 0 = Invalid SPDIF configuration 1 = Valid SPDIF configuration Bit not used, should read back 0 SPDIF slot assignment 00 = Left slot 3, right slot 4 01 = Left slot 7, right slot 8 10 = Left slot 6, right slot 9 11 = Left slot 10, right slot 11 Reserved 0 = Disables SPDIF (SPDIF_OUT is high Z) (note 1) 1 = Enable SPDIF SPDIF is a control register for Reg 3Ah, this bit must be set low i.e. SPDIF disabled in order to write to Reg 3Ah Bits D15,D13:D0. Bit not used, should read back 0 0 = VRA disabled, DAC and ADC set to 48 KHz (Registers 2Ch and 32h loaded with the value BB80h) 1 = VRA ENABLED, Reg. 2Ch & 32h control sample rate Variable Rate Sampling Enable The Extended Audio Status Control register also contains one active bit to enable or disable the Variable Sampling Rate capabilities of the DACs and ADCs. If the VRA, bit D0, is 1, the variable IDT™ 61 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING STAC9766/9767 V 7.4 12/06 STAC9766/9767 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING PC AUDIO sample rate control registers (2Ch and 32h) are active, and “on-demand” slot data required transfers are allowed. If the VRA bit is 0, the DACs and ADCs will operate at the default 48 KHz data rate. The STAC9766/9767 supports “on-demand” slot request flags. These flags are passed from the CODEC to the AC’97 controller in every audio input frame. Each time a slot request flag is set (active low) in a given audio frame, the controller will pass the next PCM sample for the corresponding slot in the audio frame that immediately follows. The VRA enable bit must be set to 1 to enable “on-demand” data transfers. If the VRA enable bit is not set, the CODEC will default to 48 KHz transfers and every audio frame will include an active slot request flag and data is transferred every frame. For variable sample rate output, the CODEC examines its sample rate control registers, the state of the FIFOs, and the incoming SDATA_OUT tag bits at the beginning of each audio output frame to determine which SLOTREQ bits to set active (low). SLOTREQ bits are asserted during the current audio input frame for active output slots, which will require data in the next audio output frame. For variable sample rate input, the tag bit for each input slot indicates whether valid data is present or not. Thus, even in variable sample rate mode, the CODEC is always the master: for SDATA_IN (CODEC to controller), the CODEC sets the TAG bit; for SDATA_OUT (controller to CODEC), the CODEC sets the SLOTREQ bit and then checks for the TAG bit in the next frame. When VRA is set to 0, the PCM rate registers (2Ch and 32h) are overwritten with BB80h (48 KHz). 8.1.20.2. SPDIF The SPDIF bit in the Extended Audio Status Control Register is used to enable and disable the SPDIF functionality within the STAC9766/9767. If the SPDIF is set to a 1, then the function is enabled. When set to a 0, it is disabled. 8.1.20.3. SPCV (SPDIF Configuration Valid) The SPCV bit is read only and indicates whether or not the SPDIF system is set up correctly. When SPCV is a 0, it indicates the system configuration is invalid. When SPCV is a 1, it indicates the system configuration is valid. 8.1.20.4. SPSA1, SPSA0 (SPDIF Slot Assignment) SPSA1 and SPSA0 combine to provide the slot assignments for the SPDIF data. The following details the slot assignment relationship between SPSA1 and SPSA0. The STAC9766/9767 are AMAP compliant with the following table. Table 21. AMAP Compliant CODEC ID Function SPSA = 00 SPSA = 01 SPSA = 10 SPSA = 11 slot assignment slot assignment slot assignment slot assignment 00 01 2-ch Primary w/SPDIF 2-ch Dock CODEC w/SPDIF 3&4 3&4 7 & 8* 7&8 6&9 6 & 9* 10 & 11 10 & 11 10 +2-ch Surr w/ SPDIF 3&4 7&8 6 & 9* 10 & 11 11 +2-ch Cntr/LFE w/ SPDIF 3&4 7&8 6&9 10 & 11* Note: * is the default slot assignment IDT™ 62 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING STAC9766/9767 V 7.4 12/06 STAC9766/9767 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING 8.1.21. PC AUDIO PCM DAC Rate Registers (2Ch and 32h) The internal sample rate for the DACs and ADCs is controlled by the value in these read/write registers that contain a 16-bit unsigned value between 0 and 65535 representing the conversion rate in Hertz (Hz). In VRA mode (register 2Ah bit D0 = 1), if the value written to these registers is supported, that value will be echoed back when read, otherwise the closest (higher in the case of a tie) sample rate is supported and returned. Per PC 99 / PC 2001 specification, independent sample rates are supported for record and playback. Whenever VRA is set to 0, the PCM rate registers (2Ch and 32h) will be loaded with BB80h (48 KHz). If VRA is set to a 0, any write to this address will be ignored and the rate remains at 48 KHz. Table 22. Hardware Supported Sample Rates Sample Rate 8.1.22. SR15-SR0 Value 8 KHz 1F40h 11.025 KHz 16 KHz 2B11h 3E80h 22.05 KHz 5622h 32 KHz 44.1 KHz 7D00h AC44h 48 KHz BB80h PCM DAC Rate (2Ch) Default: BB80h (see table22: page63) 8.1.23. D15 D14 D13 D12 D11 D10 D9 D8 SR15 SR14 SR13 SR12 SR11 SR10 SR9 SR8 D7 SR7 D6 SR6 D5 SR5 D4 SR4 D3 SR3 D2 SR2 D1 SR1 D0 SR0 D11 SR11 D10 SR10 D9 SR9 D8 SR8 PCM LR ADC Rate (32h) Default: BB80h (see table22: page63) D15 SR15 IDT™ D14 SR14 D13 SR13 D12 SR12 D7 D6 D5 D4 D3 D2 D1 D0 SR7 SR6 SR5 SR4 SR3 SR2 SR1 SR0 63 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING STAC9766/9767 V 7.4 12/06 STAC9766/9767 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING 8.1.24. PC AUDIO SPDIF Control (3Ah) Default: 2000h D15 D14 D13 D12 D11 D10 D9 D8 V D7 DRS D6 SPSR1 D5 SPSR2 D4 L D3 CC6 D2 CC5 D1 CC4 D0 CC3 CC2 CC1 CC0 PRE COPY /AUDIO PRO Bit(s) Reset Value 15 in 2.3 IDT™ Access Name Description (note 1-2) Validity: This bit affects the “Validity” flag, bit transmitted in each S/PDIF subframe, and enables the S/PDIF transmitter to maintain connection during error or mute conditions. Subframe bit = 0 indicates that data is valid for conversion at the receiver, 1 indicates invalid data (not suitable for conversion at the receiver). V 14 0 13:12 10 11 0 10:4 0 3 0 2 0 1 0 0 0 If “V” = 1, then each S/PDIF subframe (Left & Right) should have bit “Validity” flag = 1 or set based on the assertion or de-assertion of the AC '97 “VFORCE” bit within the Extended Audio Status and Control Register (D15, register 2Ah). Read Only DRS 1 = Double Rate SPDIF support (always = 0) SPDIF Sample Rate. 00 - 44.1 KHz Rate Read & Write SPSR[1,0] 01 - Reserved 10 - 48 KHz Rate (default) 11 - 32 KHz Rate Generation Level is defined by the IEC standard, or as Read & Write L appropriate. Category Code is defined by the IEC standard or as appropriate Read & Write CC[6, 0] by media. 0 = 0 µsec Pre-emphasis Read & Write PRE 1 = Pre-emphasis is 50/15 µsec 0 = Copyright not asserted Read & Write COPY 1 = Copyright is asserted 0 = PCM data Read & Write /AUDIO 1 = Non-Audio or non-PCM format 0 = Consumer use of the channel Read & Write PRO 1 = Professional use of the channel 64 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING STAC9766/9767 V 7.4 12/06 STAC9766/9767 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING 8.2. PC AUDIO General Purpose Input & Outputs 8.2.1. EAPD EAPD can act as a GPIO, but is unaffected by the following registers. To use EAPD as a GPIO, use Register 74h, the EAPD Access Register (see Section8.4.11: page78). Additional information about EAPD can also be found in Section 8.1.18.3: page 59. 8.2.2. GPIO Pin Definitions GPIO pins are programmable to have input/output functionality. The data values (status) for these pins are all in one register with input/output configuration in a separate register. Control of GPIO pins configured for output is achieved by setting the corresponding bit in output slot 12; status of GPIO pins configured for input is returned on input slot 12. The CODEC must constantly set the GPIO pins that are configured for output, based upon the value of the corresponding bit position of the control slot 12. The CODEC should ignore output slot 12 bits that correspond to GPIO control pins configured as inputs. The CODEC must constantly update status on input slot 12, based upon the logic level detected at each GPIO pin configured for input. A GPIO output pin value that is written via slot 12 in the current frame will not affect the GPIO status that is returned in that particular write frame. This slot-12 based control/status protocol minimizes the latency and complexity, especially for host-based Controllers and host data pump software, and provides high speed monitoring and control, above what could be achieved with command/status slots. For host-based implementations, most AC‘97 registers can be shadowed by the driver in order to provide immediate response when read by the processor, and GPIO pins configured as inputs should be capable of triggering an interrupt upon a change of status. The AC-link request for GPIO pin status is always delayed by at least one frame time. Read-Modify-Writes across the AC-link incur latency issues which must be accounted for by the software driver or AC‘97 Digital Controller firmware. PCI retries should be kept to a minimum wherever possible. 8.2.3. GPIO Pin Implementation The GPIOs are set to a high impedance state on power-on or a cold reset. It is up to the AC‘97 Digital Controller to first enable the output after setting it to the desired state. IDT™ 65 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING STAC9766/9767 V 7.4 12/06 STAC9766/9767 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING 8.2.4. PC AUDIO Extended Modem Status and Control Register (3Eh) Default: 0100h D15 D14 D13 D12 RESERVED D11 D10 D9 D8 PRA D7 D6 D5 D4 D3 D2 D1 D0 RESERVED Bit(s) 15:9 Access Read Only Reset Value 0 Name RESERVED 8 Read / Write 1 PRA 7:1 Read Only 0 RESERVED 0 Read Only 0 GPIO 8.2.5. GPIO Description Bit not used, should read back 0 0 = GPIO powered up / enabled 1 = GPIO powered down / disabled Bit not used, should read back 0 0 = GPIO not ready (powered down) 1 = GPIO ready (powered up) GPIO Pin Configuration Register (4Ch) Default: 0003h D15 D14 D13 D12 D11 D10 D9 D8 D2 D1 GC1 (GPIO1) D0 GC0 (GPIO0) RESERVED D7 D6 D5 D4 D3 RESERVED Bit(s) 15:2 Access Read Only Reset Value 0 Name RESERVED 1 Read / Write 1 GC1 0 Read / Write 1 GC0 8.2.6. Description Bit not used, should read back 0 0 = GPIO1 configured as output 1 = GPIO1 configured as input 0 = GPIO0 configured as output 1 = GPIO0 configured as input GPIO Pin Polarity/Type Register (4Eh) Default: FFFFh D15 D14 D13 D12 D11 RESERVED D7 D6 D5 D4 D3 D10 D2 RESERVED Bit(s) 15:2 1 0 IDT™ D9 D8 D1 D0 GP1 (GPIO1) GP0 (GPIO0) Access Read Only Reset Value Name Description 0 RESERVED Bit not used, should read back 0 0 = GPIO1 Input Polarity Inverted, CMOS output drive. Read / Write 1 GP1 1 = GPIO1 Input Polarity Non-inverted, Open-Drain output drive. 0 = GPIO0 Input Polarity Inverted, CMOS output drive. Read / Write 1 GP0 1 = GPIO0 Input Polarity Non-inverted, Open-Drain output drive. 66 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING STAC9766/9767 V 7.4 12/06 STAC9766/9767 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING 8.2.7. PC AUDIO GPIO Pin Sticky Register (50h) Default: 0000h D15 D14 D7 D6 D13 D12 D11 D10 D5 RESERVED D4 D3 D2 RESERVED D8 D1 D0 GS1 (GPIO1) GS0 (GPIO0) Bit(s) 15:2 Access Read Only Reset Value 0 Name RESERVED 1 Read / Write 0 GS1 0 Read / Write 0 GS0 8.2.8. D9 Description Bit not used, should read back 0 0 = GPIO1 Non Sticky configuration. 1 = GPIO1 Sticky configuration. 0 = GPIO0 Non Sticky configuration. 1 = GPIO0 Sticky configuration. GPIO Pin Mask Register (52h) Default: 0000h D15 D14 D13 D12 D11 D10 D9 D8 RESERVED D7 D6 D5 D4 RESERVED D3 Bit(s) 15:2 Access Read Only Reset Value 0 Name RESERVED 1 Read / Write 0 GW1 0 Read / Write 0 GW0 8.2.9. D2 D1 D0 GW1 (GPIO1) GW0 (GPIO0) Description Bit not used, should read back 0 0 = GPIO1 interrupt not passed to GPIO_INT slot 12. 1 = GPIO1 interrupt is passed to GPIO_INT slot 12. 0 = GPIO0 interrupt not passed to GPIO_INT slot 12. 1 = GPIO0 interrupt is passed to GPIO_INT slot 12. GPIO Pin Status Register (54h) Default: 0000h D15 D14 D13 D12 D11 RESERVED D10 D7 D6 D5 D4 D3 D2 RESERVED IDT™ Bit(s) Access 15:2 Read Only D9 D8 D1 D0 GI1 (GPIO1) GI0 (GPIO0) Reset Name Description Value 0 RESERVED Bit not used, should read back 0 67 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING STAC9766/9767 V 7.4 12/06 STAC9766/9767 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING Bit(s) 8.3. Access Reset Value Name 1 Read / Write x GI1 0 Read / Write x GI0 PC AUDIO Description When GPIO1 is configured as output and Register h74 bit[0] = 0 (default), the value of this register will be placed on the GPIO1 pad. When GPIO1 is configured as output and Register h74 bit[0] = 1, the GPIO1 pad will get its value from slot12. When GPIO1 is configured as input and configured as a sticky, writing a 1 does nothing, writing a 0 clears this bit. When GPIO1 is configured as input, this register reflects the value on the GPIO1 pad after interpretation of the polarity and sticky configurations. When GPIO0 is configured as output and Register h74 bit[0] = 0 (default), the value of this register will be placed on the GPIO0 pad. When GPIO0 is configured as output and Register h74 bit[0] = 1, the GPIO0 pad will get its value from slot12. When GPIO0 is configured as input and configured as a sticky, writing a 1 does nothing, writing a 0 clears this bit. When GPIO0 is configured as input, this register reflects the value on the GPIO0 pad after interpretation of the polarity and sticky configurations. Extended CODEC Registers Page Structure Definition Registers 60h-68h are the Extended CODEC Registers: These registers allow for the definition of further capabilities. These bits provide a paged address space for extended CODEC information. The Page Selector bits in the Audio Interrupt and Paging register (Register 24h bits 3:0) control the page of information viewed through this page window. 8.3.1. Extended Registers Page 00 Page 00 of the Extended CODEC Registers is reserved for vendor specific use. Driver writers should not access these registers unless the Vendor ID register has been checked first to ensure that the vendor of the AC '97 component has been identified and the usage of the vendor defined registers understood. 8.3.2. Extended Registers Page 01 The usage of Page 01 of the Extended CODEC Registers is defined in Register 24h found in Section 8.1.17: page 57. 8.3.3. Extended Registers Page 02, 03 Pages 02 and 03 of the Extended CODEC Registers are reserved for future use. IDT™ 68 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING STAC9766/9767 V 7.4 12/06 STAC9766/9767 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING 8.4. PC AUDIO STAC9766/9767 Paging Registers The AC’97 Specification Rev 2.3 uses a paging mechanism in order to increase the number of registers. The registers currently used in the paging are 60h to 6Eh. Additional information about the Extended CODEC Registers, please refer to Section 8.3: page68. One of two pages can be made active at any time, set in Register 24h. Register 24h is the Audio Interrupt and Paging Register. Additional details about Register 24h is located in Section 8.1.17: page57. If page 00h is active, registers 60h to 6Eh are Vendor Specific. If page 01h is active, registers 60h to 6Eh have the following functionality: Reg FUNCTION Provides the CODEC Class and a Vendor specified revision 60h CODEC Class/Revision identifier. Allows for population by the system BIOS to identify the PCI Sub 62h PCI SVID System Vendor ID. Allows for population by the system BIOS to identify the PCI Sub 64h PCI SSID System ID. Provides the type of audio function being selected and which jack 66h Function Select conductor the selected value is measured from. Includes information about Gain, Inversion, Buffer delays, 68h Function Information Information Validity, and Function Information presence. Includes information about the connector/jack location, Input verses 6Ah Sense Register Output sensing, the Order of the sense results, and the IDT specific sense results. 6Ch Reserved 6Eh Reserved 8.4.1. NAME Location 8.4.1: page69 8.4.2: page70 Note:: page70 Note:: page71 8.4.5: page72 8.4.7: page74 CODEC Class/Rev (60h Page 01h ) Register 24h must be set to Page 01h to access this register. Default: 12xxh D15 D14 D13 RESERVED D7 RV7 Bit(s) 15-13 IDT™ D6 RV6 Reset Value D5 RV5 Name RESERVED D12 D11 D10 D9 D8 CL4 CL3 CL2 CL1 CL0 D4 RV4 D3 RV3 D2 RV2 D1 RV1 D0 RV0 Description Reserved - not defined 69 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING STAC9766/9767 V 7.4 12/06 STAC9766/9767 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING Bit(s) Reset Value Name 12-8 CL4:CL0 7-0 RV7:RV0 8.4.2. PC AUDIO Description CODEC Compatibility Class (RO) This is a CODEC vendor specific field to define software compatibility for the CODEC. Software read this field together with CODEC vendor ID (reg 7C-7Eh) to determine vendor specific programming interface compatibility. Software can rely on vendor specific register behavior to be compatible among vendor CODECs of the same class. 00h - Field not implemented 01h-1Fh - Vendor specific compatibility class code Equals Vendor ID2(Reg 7Eh) bits D7 to D0 Revision ID: (RO) This register specifies a device specific revision identifier. The value is chosen by the vendor. Zero is an acceptable value. This field should be viewed as a vendor defined extension to the CODEC ID. This number changes with new CODEC stepping of the same CODEC ID. Equals Major Rev bits (Reg 6Ch) bits D7 to D0. PCI SVID (62h Page 01h) Register 24h must be set to Page 01h to access this register. Default: FFFFh D15 PVI15 D14 PVI14 D13 PVI13 D12 PVI12 D11 PVI11 D10 PVI10 D9 PVI9 D8 PVI8 D7 D6 D5 D4 D3 D2 D1 D0 PVI7 PVI6 PVI5 PVI4 PVI3 PVI2 PVI1 PVI0 Bit(s) Reset Value 15-0 Name Description PCI Sub System Vendor ID: This field provides the PCI Sub System Vendor ID of the Audio or Modem Sub PVI15:PVI0 Assembly Vendor (i.e., CNR manufacturer, Motherboard Vendor). This is NOT the CODEC vendor PCI Vendor ID, nor the AC '97 controller PCI Vendor ID. If data is not available, returns FFFFh. Note: This register is populated by the BIOS and does not reset on RESET#. 8.4.3. PCI SSID (64h Page 01h) Register 24h must be set to Page 01h to access this register. Default: FFFFh IDT™ D15 D14 D13 D12 D11 D10 D9 D8 PI15 D7 PI14 D6 PI13 D5 PI12 D4 PI11 D3 PI10 D2 PI9 D1 PI8 D0 PI7 PI6 PI5 PI4 PI3 PI2 PI1 PI0 70 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING STAC9766/9767 V 7.4 12/06 STAC9766/9767 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING Bit(s) Reset Value 15-0 PC AUDIO Name Description PCI Sub System ID: This field provides the PCI Sub System ID of the Audio or Modem Sub Assembly (i.e., CNR Model, Motherboard SKU). This is NOT the CODEC vendor PCI ID, nor PI15:PVI0 the AC '97 controller PCI ID. Information in this field must be available for AC '97 controller reads when CODEC ready is asserted in AC link.If data is not available, returns FFFFh. Note: This register is populated by the BIOS and does not reset on RESET#. 8.4.4. Function Select (66h Page 01h ) Register 24h must be set to Page 01h to access this register. Default: 0000h D15 D14 D13 D12 D7 D6 RESERVED D5 D4 FC3 D11 D10 D9 D8 D2 FC1 D1 FC0 D0 T/R RESERVED D3 FC2 Bit(s) Reset Value Name Description 15-5 Reserved Reserved Function Code bits: 00h - Line Out (Master Out) 01h - Head Phone Out (AUX Out) Setting the T/R bit to 0 = Left,1 = Right 02h - DAC 3 (C/LFE) - Not Supported 03h - SPDIF out 04h - Phone In 05h - Mic1 (Mic select = 0) 06h - Mic2 (Mic select = 1) 07h - Line In 08h - CD In 09h - Video In 4-1 00h FC3:FC0 0Ah - Aux In 0Bh - Mono Out 0C-0Fh - Reserved For supported Jack and Mic Sense Functions, see Table23: page72. The Function Code Bits are used to read Register 68h (Page 01h) and Register 6Ah (Page 01h). Mono I/O should report relevant sense and function information on Tip, and report not supported on Ring. 0 IDT™ 0 T/R Setting the function code to unsupported values will return a 0 when accessing the Information Valid Bit in page 01 register 68h bit 5. Tip or Ring selection Bit.This bit sets which jack conductor the sense value is measured from. Software will program the corresponding the Ring/Tip selector bit together with the I/O number in bits FC[3:0]. 0 - Tip (Left) 1 - Ring (Right) 71 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING STAC9766/9767 V 7.4 12/06 STAC9766/9767 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING PC AUDIO Note: This register does not reset on RESET#. Function Code I/O Sense Capability 00h 01h Line_Out Headphone_Out Jack Sense Jack Sense 05h Mic1 Mic Sense 06h Mic2 Mic Sense Table 23. Supported Jack and Mic Sense Functions 8.4.5. Function Information (68h Page 01h) Register 24h must be set to Page 01h to access this register. Default: 00xxh, see table 24: page73. D15 D14 D13 D12 D11 D10 D9 D8 G4 D7 G3 D6 G2 D5 G1 D4 G0 D3 INV D2 DL4 D1 DL3 D0 DL2 DL1 DL0 IV Bit(s) Reset Value 15 0 G4 14-11 0 G3:G0 10 IDT™ Name INV RESERVED FIP Description Gain Sign Bit: The CODEC updates this bit with the sign of the gain value present in G[3:0]. The BIOS updates this to take into consideration external amplifiers or other external logic when relevant. G[4] indicates whether the value is a gain or attenuation. Gain in the G4 bit is in terms of dB. This bit is Read/Write and only reset on POR and not by RESET#. Gain Bits: The CODEC updates these bits with the gain value (dB relative to level-out) in 1.5dBV increments. The BIOS updates these to take into consideration external amplifiers or other external logic when relevant. G[0:3] indicates the magnitude of the gain. G[4] indicates whether the value is a gain or attenuation. For Gain/Attenuation settings, see Table 25: page74. These bits are read/write and are not reset on RESET#. Inversion bit: Indicates that the CODEC presents a 180 degree phase shift to the signal. 0h - No inversion reported 1h - Inverted This bit is read/write and is not reset on RESET#. BIOS should invert for each inverting gain stage. 72 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING STAC9766/9767 V 7.4 12/06 STAC9766/9767 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING Bit(s) Reset Value 9-5 4 1 3-1 0 0 NA PC AUDIO Name Description Buffer delays: CODEC will provide a delay measurement for the input and output channels. Software will use this value to accurately calculate audio stream position with respect to what is been reproduced or recorded. These values are in 20.83 microsecond (1/48000 second) units. For output channels, this timing is from the end of AC Link frame in which the sample is provided, until the time the analog signal appears at the output pin. For input streams, this is from when the analog signal is presented at the pin until the representative sample is provided on the AC Link. Analog in and out paths are not considered as part of this delay. DL4:DL0 The measurement is a 'typical' measurement, at a 48 KHz sample rate, with minimal in-CODEC processing (i.e., 3D effects are turned off.) 00h - Information not provided 01h…1Eh - Buffer delay in 20.83 µs units 1Fh - reserved These bits are read/write and are not reset on RESET#. The default value is the delay internal to the CODEC. The BIOS may add to this value the known delays external to the CODEC, such as for an external amplifier. Information Valid Bit: Indicates whether a sensing method is provided by the CODEC and if information field is valid. This field is updated by the CODEC. 0h--After CODEC RESET# de-assertion, it indicates the CODEC does NOT provides sensing logic and this bit will be Read Only. After a sense cycle is completed indicates that no information is provided on the sensing method. IV 1h--After CODEC RESET# de-assertion, it indicates the CODEC provides sensing logic for this I/O and this bit is Read/Write. After clearing this bit by writing 1, when a sense cycle is completed the assertion of this bit indicates that there is valid information in the remaining descriptor bits. Writing “0” to this bit has no effect. BIOS should NOT write this bit, as it is reset on RESET#. RESERVED Bit not used, should read back 0 Function Information Present This bit is set to a 1 indicates that the G[4:0], INV, DL[4:0](Register 68h, Page FIP 01h) and ST[2:0](register 6Ah, Page 01h) are supported and R/W capable. This bit is Read Only. Table 24. Reg 68h Default Values Reg 66h Function Code Reg 68h Default Value 00h Line Out 01h Headphone Out 0010h 0010h 05h Mic1 0010h 06h Mic2 All other Function Codes 0010h 0000h For RESET#: Reg 68h default value is 0000h. IDT™ 73 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING STAC9766/9767 V 7.4 12/06 STAC9766/9767 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING PC AUDIO Table 25. Gain or Attenuation Examples G[4:0] Gain or Attenuation (dB relative to level-out) 00000 00001 0 dBV +1.5 dBV 01111 +24 dBV 10001 11111 -1.5 dBV -24 dBV Table 26. Register 68h/Page 01h Bit Overview Bit D5:D15 D4 Read/Write and should NOT be set by the BIOS D3:1 D0 8.4.6. Bit R/W Overview Read/Write and only reset on POR (Power on Reset) and not by RESET#. Reserved Read Only. Digital Audio Control (6Ah, Page 00h) To access Register 6Ah, Page 00h must be selected in Register 24h. Default: 0000h D15 D14 D13 D7 D6 D5 D12 D11 D10 D9 D8 RESERVED D4 D3 D2 D1 D0 SPOR DO1 RSVD RESERVED Bit(s) Reset Value Name Description 15:3 0 RESERVED Bits not used, should read back 0 Over-ride Register 2Ah, D12 write-lock when SPDIF_EN = 1. 2 0 SPOR All bits except SPDIF sample-rate are affected (D13-D12). Allows for sub-code changing on-the-fly. SPDIF Digital Output Source Selection: 1 0 DO1 DO1 = 0; PCM data from the AC-Link to SPDIF DO1 = 1; ADC record data to SPDIF 0 0 RESERVED Bits not used, should read back 0 8.4.7. Sense Details (6Ah Page 01h) Register 24h must be set to Page 01h to access this register. Default: NA IDT™ D15 D14 D13 D12 D11 D10 ST2 ST1 ST0 D7 OR1 D6 OR0 D5 SR5 S4 S3 D4 SR4 D3 SR3 74 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING D9 D8 S2 S1 S0 D2 SR2 D1 SR1 D0 SR1 STAC9766/9767 V 7.4 12/06 STAC9766/9767 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING Bit(s) Reset Value 15-13 12-8 7-6 5-0 PC AUDIO Name Description Connector/Jack location bits This field describes the location of the jack in the system. 0h - Rear I/O Panel 1h - Front Panel ST2:ST0 2h - Motherboard 3h - Dock/External 4h:6h - Reserved 7h - No Connection/unused I/O These bits are Read/Write. Sensed bits meaning relates to the I/O being sense as output or inputs. Sensed bits (outputs): See Table 27: page75. This field allows for the reporting of the type of output peripheral/device plugged in the jack. Values specified below should be interrogated in conjunction with the SR[5:0] and OR[1:0] bits for accurate reporting. S4:S0 Sensed bits (inputs): See Table 28: page76. This field allows for the reporting of the type of input peripheral/device plugged in the jack. Values specified below should be interrogated in conjunction with the SR[5:0] and OR[1:0] bits for accurate reporting. This field is Read Only. Order Bits. These bits indicate the order the sense result bits SR[5:0] are using. 00 - 100 (i.e., Ohms) OR1:0 01 - 101 (i.e., 10 Ohms) 10 - 102 (i.e., 100 Ohms) 11 - 103 (i.e., 1K Ohms) Sense Result bits SR5:SR0 These bits are used to report a vendor specific fingerprint or value. (Resistance, impedance, reactance, etc.) This field is Read Only. Table 27. Sensed Bits (Outputs) Reported Value Data not valid. Indicates that the reported value(s) is invalid. No connection. Indicates that there are no connected devices. 2h Fingerprint. Indicates a specific fingerprint value for devices that are not specified or unknown. 3h 4h Speakers (8 ohms) Speakers (4 ohms) 5h Powered Speakers 6h 7h Stereo Headphone RESERVED 8h RESERVED 9h Headset (mono speaker left channel and mic.) Other. Allows a vendor to report sensing other type of devices/peripherals. SR[5:0] together with OR[1:0] provide information regarding the type of device sensed. Ah Bh-Eh Fh IDT™ Output Peripheral/Device 0h 1h Reserved Unknown (use fingerprint) 75 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING STAC9766/9767 V 7.4 12/06 STAC9766/9767 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING PC AUDIO Table 28. Sensed Bits (Inputs) Reported Value Input Peripheral/Device 0h 1h Data not valid. Indicates that the reported value(s) is invalid. No connection. Indicates that there are no connected devices. 2h Fingerprint. Indicates a specific fingerprint value for devices that are not specified. 3h 4h Microphone (mono) Reserved 5h Stereo Line In (CE device attached) 6h 7h Reserved Reserved 8h Reserved 9h Headset (mono speaker left channel and mic.) Other. Allows a vendor to report sensing other type of devices/peripherals. SR[5:0] together with OR[1:0] provide information regarding the type of device sensed. Ah Bh-Eh Fh 8.4.8. Reserved Unknown (use fingerprint) Revision Code (6Ch) To access Register 6Ch, Page 00h must be selected in Register 24h. Default: 00xxh D15 D14 D7 D13 D12 D11 D10 D9 D8 D5 MINORREV D4 D3 D2 D1 D0 D6 MAJORREV Bit(s) Reset Value 15:8 00h 7:0 xx 8.4.9. Name Description Minor Revision ID. These bits are read only and will be updated based on minor MINORREV device changes which will not require software changes. Major Revision ID. These bits are read only and will be updated based on major MAJORREV device changes. Analog Special (6Eh) To access Register 6Eh, Page 00h must be selected in Register 24h. Default: 1000h D15 IDT™ D14 RESERVED D13 D12 AC97MIX D11 D10 D3 D2 D7 D6 D5 D4 RSVD MUTEFIX DISABLE ADCSLT1 ADCSLT0 D9 RESERVED D1 RSVD MIC GAIN VAL SPLYOVR EN 76 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING STAC9766/9767 D8 D0 SPLYOVR VAL V 7.4 12/06 STAC9766/9767 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING Bit(s) Reset Value 15:13 0 12 1 11:7 0 6 0 5:4 0 3 0 2 0 1 0 0 0 8.4.10. PC AUDIO Name RESERVED Description Bits not used, should read back 0 0 = mixer record contains a mix of all mono and stereo analog input signals, not the DAC (ALL ANALOG mode) 1 = mixer record contains a mix of all mono and stereo analog input signals plus the DAC signal (AC97 mode) This bit only has an effect when either Stereo Mix or Mono Mix is selected as the record source in Reg. 1Ah. AC97MIX The “ALL” mode is useful in conjunction with the POP BYPASS mode (Reg. 20h;D15) to record all analog sources, perform further processing in the digital domain, including combining with other PCM data, and routing through the DACs directly to Line Out, Headphone Out, or Mono Out. A Stereo Mix recording will be affected by the setting of the 3D Effects bit (Reg. 20h;D13) RESERVED Bits not used, should read back 0 0 = MUTE FIX Enabled 1 = MUTE FIX Disabled MUTEFIX When this bit is zero, and either channel is set to -46.5dB attenuation, 1Fh, DISABLE then that channel is fully muted. When this bit is one, then operation is per AC’97 specification. Select slots for ADC data on ACLINK 00 = left slot 3, right slot 4 ADCSLT1:0 01 = left slot 7, right slot 8 10 = left slot 6, right slot 9 11 = left slot 10, right slot 11 RESERVED Reserved Adds +10dB gain to the selected MIC input. Use in conjunction with BOOSTEN (Reg. 0Eh;D6) BOOSTEN MICGAINVAL MIC GAIN VAL 0 0 = 0 dB 0 1 = 10 dB 1 0 = 20 dB 1 1 = 30 dB Supply Override bit allows override of the supply detect. SPLYOVR_EN 0 = no override on supply detect 1 = override supply detect with bit 0 Supply Override Value provides the analog voltage operation values. SPLYOVR_VA L 0 = force 3.3V operation 1 = force 5V operation Analog Current Adjust (72h) To unlock Register 72h, write 0xABBA to Register 70h. Default: 0000h D15 D14 D13 D12 D11 D10 D9 D8 D2 D1 D0 RESERVED D7 INT APOP IDT™ D6 D5 D4 D3 RESERVED 77 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING STAC9766/9767 V 7.4 12/06 STAC9766/9767 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING PC AUDIO Bit(s) Reset Value Name Description 15:8 0 RESERVED Reserved 0 = Anti Pop Enabled 1 = Anti Pop Disabled The STAC9766/9767 includes an internal power supply anti-pop circuit that prevents audible clicks and pops from being heard when the CODEC is powered on and off. This function is accomplished by delaying the charge/discharge of the VREF capacitor (Pin 27). C VREF value of 1 µF will cause a turn-on delay of roughly 7 0 INT_APOP 3 seconds, which will allow the power supplies to stabilize before the CODEC outputs are enabled. The delay will be extended to 30 seconds if a C VREF value of 10 µF is used. The CODEC outputs are also kept stable for the same amount of time at power-off to allow the system to be gracefully turned off. The INT_APOP bit allows this delay circuit to be bypassed for rapid production testing. Any external component anti-pop circuit is unaffected by the internal circuit. 6:0 0 RESERVED Reserved 8.4.11. EAPD Access Register (74h) Default: 0800h D15 EAPD D14 D13 RESERVED D12 D11 EAPD_OEN D10 D9 RESERVED D8 D7 D6 D5 D4 D3 D2 D1 D0 INTDIS GPIOACC GPIOSLT12 RESERVED Bit(s) Reset Value 15 0 14:12 0 11 1 10:3 0 2 0 1 0 0 0 Name Description EAPD data Enable EAPD EAPD data output on EAPD when bit D11 = 1 EAPD data input from pin when bit D11 = 0 RESERVED Bit not used, should read back 0 EAPD Pin Enable EAPD_OEN 0 = EAPD configured as input pin 1 = EAPD configured as output pin RESERVED Bit not used, should read back 0 Interrupt disable option. Interrupts cleared by writing a 1 to I4 (Reg24h:D15) INTDIS 0 = will clear both SENSE and GPIO interrupts 1 = will only clear SENSE interrupts. GPIO interrupts will have to be cleared in Reg54h. GPIO ACCESS GPIOACC 0 = ACLINK access from GPIO Pads 1 = ACLINK access from GPIO Register 54h 0 = GPIO0/1 access via Reg54h when GPIO is set as an output, for input Slot12 data will be 0h. 1 = GPIO0/1 access via Slot 12 when GPIO is set as an output, for inputs GPIOSLT12 Reg54h will not be updated. This can only be used if a modem CODEC is not present in the system and using Slot12. IDT™ 78 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING STAC9766/9767 V 7.4 12/06 STAC9766/9767 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING 8.4.12. PC AUDIO High Pass Filter Bypass (78h*) To unlock portion of Register 78h, write 0xABBA to Register 76h. Default: 0000h D15 D14 D7 D13 D6 D5 D12 D11 D10 D9 RESERVED D4 D3 D2 D1 RESERVED Bit(s) Reset Value 15:1 0 0 8.4.13. 0 D8 D0 ADC HPF BYP Name RESERVED Description Bits not used, should read back 0 0 = Normal operation, (ADC High Pass Filter active) ADC HPF BYP 1 = ADC High Pass Filter Bypass Stereo Mic Enable Register (78h*) To unlock portion of Register 78h, write 0x7272 to Register 72h. Default: 0000h D15 D14 D13 D12 D11 RESERVED D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 RSVD STEREO_ MIC Bit(s) Reset Value 15:7 0 6 8.5. 0 RESERVED Name RESERVED Description Bits not used, should read back 0 0 = Stereo Mic Disabled (default) STEREO_MIC 1 = Stereo Mic Enabled Vendor ID1 and ID2 (Index 7Ch and 7Eh) These two registers contain four 8-bit ID codes. The first three codes have been assigned by Microsoft using their Plug and Play Vendor ID methodology. The fourth code is a IDT, Inc. assigned code identifying the STAC9766/9767. The ID1 register (index 7Ch) contains the value 8384h, which is the first (83h) and second (84h) bytes of the Microsoft ID code. The ID2 register (index 7Eh) contains the value 7666h, which is the third (76h) byte of the Microsoft ID code, and 66h which is the STAC9766/9767 ID code. IDT™ 79 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING STAC9766/9767 V 7.4 12/06 STAC9766/9767 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING 8.5.1. PC AUDIO Vendor ID1 (7Ch) Default: 8384h 8.5.2. D15 D14 D13 D12 D11 D10 D9 D8 1 D7 0 D6 0 D5 0 D4 0 D3 0 D2 1 D1 1 D0 1 0 0 0 0 1 0 0 D13 D12 D11 D10 D9 D8 Vendor ID2 (7Eh) Default: 7666h D15 IDT™ D14 0 1 1 1 0 1 1 0 D7 0 D6 1 D5 1 D4 0 D3 0 D2 1 D1 1 D0 0 80 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING STAC9766/9767 V 7.4 12/06 STAC9766/9767 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING PC AUDIO 9. LOW POWER MODES The STAC9766/9767 is capable of operating at reduced power when no activity is required. The power-down state is controlled by the Powerdown Register (26h). There are seven separate power-down commands. The power down options are listed in Table 29. The first three bits, PR0..PR2, can be used individually or in combination with each other, and control power distribution to the ADCs, DACs and Mixer. The last analog power control bit, PR3, affects analog bias and reference voltages, and can only be used in combination with PR1, PR2 and PR3. PR3 essentially removes power from all analog sections of the CODEC and is generally only asserted when the CODEC will not be needed for long periods. PR0 and PR1 control the PCM ADCs and DACs only. PR2 and PR3 do not need to be “set” before a PR4, but PR0 and PR1 should be “set” before PR4. PR5 disables the DSP clock and does not require an external cold reset for recovery. PR6 disables the headphone driver amplifier for additional analog power saving. Table 29. Low Power Modes GRP Bits PR0 Function PCM in ADCs & Input Mux Powerdown PR1 PCM out DACs Powerdown PR2 PR3 Analog Mixer power down (VREF still on) Analog Mixer power down (VREF off) PR4 Digital Interface (AC-Link) power down (BIT_CLK forced low) PR5 PR6 Digital Clock disable, BIT_CLK still on Powerdown HEADPHONE_OUT Figure 22. Example of STAC9766/9767 Powerdown/Powerup Flow PR0=1 Normal PR1=1 ADCs off PR0 PR0=0 & ADC=1 Ready =1 PR2=1 DACs off PR1 PR1=0 & DAC=1 PR4=1 Analog off PR2 or PR3 PR2=0 & ANL=1 Default Digital I/F off PR4 Shut off AC-Link Warm Reset Cold Reset Figure 22 illustrates an example procedure to do a complete power down of STAC9766/9767. From normal operation, sequential writes to the Powerdown Register are performed to power down STAC9766/9767 a section at a time. After everything has been shut off, a final write (of PR4) can be executed to shut down the AC-Link. The part will remain in sleep mode with all its registers holding their static values. To wake up, the AC'97 controller will send an extended pulse on the sync line, issuing a warm reset. This will restart the AC-Link (resetting PR4 to zero). The STAC9766/9767 can also be woken up with a cold reset. A cold reset will reset all of the registers to their default states (Paged Registers are semi-exempt). When a section is powered back on, the Powerdown Control/ Status register (index 26h) should be read to verify that the section is ready (stable) before attempting any operation that requires it. IDT™ 81 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING STAC9766/9767 V 7.4 12/06 STAC9766/9767 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING PC AUDIO Figure 23. Powerdown/Powerup Flow With Analog Still Alive PR0=1 Normal PR1=1 ADCs off PR0 PR0=0 & ADC=1 PR4=1 DACs off PR1 PR1=0 & DAC=1 Digital I/F off PR4 Shut off AC-Link Warm Reset Figure 23 illustrates a state when all the mixers work with the static volume settings that are contained in their associated registers. This configuration can be used when playing a CD (or external LINE_IN source) through STAC9766/9767 to the speakers, with most of the system in low power mode. The procedure for this follows the previous example except that the analog mixer is never shut down. IDT™ 82 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING STAC9766/9767 V 7.4 12/06 STAC9766/9767 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING PC AUDIO 10.MULTIPLE CODEC SUPPORT The STAC9766/9767 provides support for the multi-CODEC option according to the Intel AC'97, rev 2.3 specification. By definition there can be only one Primary CODEC (CODEC ID 00) and up to three Secondary CODECs (CODEC IDs 01, 10 and 11). The CODEC ID functions as a chip select. Secondary devices therefore have completely orthogonal register sets; each is individually accessible and they do not share registers. 10.1. Primary/Secondary CODEC Selection In a multi-CODEC environment the CODEC ID is provided by external programming of pins 45 and 46 (CID0 and CID1). The CID pin electrical function is logically inverted from the CODEC ID designation. The corresponding pin state and its associated CODEC ID are listed in the “CODEC ID Selection” table. Also see slot assignment discussion, “Multi-Channel Programming Register (Index 74h)”. Table 30. CODEC ID Selection 10.1.1. CID1 State CID0 State CODEC ID CODEC Status Dvdd or floating Dvdd or floating Dvdd or floating 0V 00 01 Primary Secondary 0V Dvdd or floating 10 Secondary 0V 0V 11 Secondary Primary CODEC Operation As a Primary device the STAC9766/9767 is completely compatible with existing AC'97 definitions and extensions. Primary CODEC registers are accessed exactly as defined in the AC'97 Component Specification and AC'97 Extensions. The STAC9766/9767operates as Primary by default, and the external ID pins (45 and 46), have internal pull-ups so that these pins may be left as no-connects for primary operation. When used as the Primary CODEC, the STAC9766/9767 generates the master AC-Link BIT_CLK for both the AC'97 Digital Controller and any Secondary CODECs. The STAC9766/9767can support up to four loads of 10 KΩ / 50 pF on the BIT_CLK output. This is to ensure that up to four CODECs will not load down the clock output. 10.1.2. Secondary CODEC Operation When the STAC9766/9767 is configured as a Secondary device the BIT_CLK pin is configured as an input at power up. Using the BIT_CLK provided by the Primary CODEC insures that everything on the AC-Link will be synchronous. As a Secondary device it can be defined as CODEC ID 01, 10, or 11 in the two-bit field(s) of the Extended Audio and/or Extended Modem ID Register(s). IDT™ 83 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING STAC9766/9767 V 7.4 12/06 STAC9766/9767 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING PC AUDIO 10.2. Secondary CODEC Register Access Definitions The AC'97 Digital Controller can independently access Primary and Secondary CODEC registers by using a 2-bit CODEC ID field (chip select) which is defined as the LSBs of Output Slot 0. For Secondary CODEC access, the AC'97 Digital Controller must invalidate the tag bits for Slot 1 and 2 Command Address and Data (Slot 0, bits 14 and 13) and place a non-zero value (01, 10, or 11) into the CODEC ID field (Slot 0, bits 1 and 0). As a Secondary CODEC, the STAC9766/9767 will disregard the Command Address and Command Data (Slot 0, bits 14 and 13) tag bits when it sees a 2-bit CODEC ID value (Slot 0, bits 1 and 0) that matches its configuration. In a sense the Secondary CODEC ID field functions as an alternative Valid Command Address (for Secondary reads and writes) and Command Data (for Secondary writes) tag indicator. Secondary CODECs must monitor the Frame Valid bit, and ignore the frame (regardless of the state of the Secondary CODEC ID bits) if it is not valid. AC'97 Digital Controllers should set the frame valid bit for a frame with a secondary register access, even if no other bits in the output tag slot except the Secondary CODEC ID bits are set. This method is designed to be backward compatible with existing AC'97 controllers and CODECs. There is no change to output Slot 1 or 2 definitions. Table 31. Secondary CODEC Register Access Slot 0 Bit Definitions Bit Output Tag Slot (16-bits) Description 15 Frame Valid 14 13 Slot 1 Valid Command Address bit (†Primary CODEC only) Slot 2 Valid Command Data bit (†Primary CODEC only) 12-3 Slot 3-12 Valid bits as defined by AC'97 2 Note: Reserved (Set to “0”) 2-bit CODEC ID field (00 reserved for Primary; 01, 10, 11 indicate †1-0 Secondary) † New definitions for Secondary CODEC Register Access Using three CODECs typically requires a controller to support SDATA_IN2. IDT™ 84 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING STAC9766/9767 V 7.4 12/06 STAC9766/9767 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING PC AUDIO 11.TESTABILITY The STAC9766/9767 has two test modes. One is for ATE in-circuit test and the other is restricted for IDT’s internal use. STAC9766/9767 enters the ATE in-circuit test mode if SDATA_OUT is sampled high at the trailing edge of RESET#. Once in the ATE test mode, the digital AC-Link outputs (BIT_CLK and SDATA_IN) are driven to a high impedance state. This allows ATE in-circuit testing of the AC'97 controller. Use of the ATE test mode is the recommended means of removing the CODEC from the AC-Link when another CODEC is to be used as the primary. This case will never occur during standard operating conditions. Once either of the two test modes have been entered, the STAC9766/9767 must be issued another RESET# with all AC-link signals held low to return to the normal operating mode. Table 32. Test Mode Activation SYNC 0 SDATA_OUT 0 Description Normal AC '97 operation 0 1 ATE Test Mode 1 1 0 1 IDT Internal Test Mode Reserved 11.1. ATE Test Mode ATE test mode allows for in-circuit testing to be completed at the board level. For this to work, the outputs of the device must be driven to a high impedance state (Z). Internal pullups for digital I/O pins must be disabled in this mode. This mode initiates on the rising edge of RESET# pin. Only a cold reset will exit the ATE Test Mode. Table 33. ATE Test Mode Operation IDT™ Pin Name Pin # Function Description SDATA_OUT 5 1 BIT_CLK 6 Z SDATA_IN 8 Z SYNC 10 0 RESET# 11 1 No Connect 31 Z Always an input No Connect 33 Z Always an input No Connect 34 Z Always an input GPIO0 43 Z GPIO1 44 Z CID0 45 Z CID1 46 Z EAPD 47 Z SPDIF 48 Z Must be held high at the rising edge of RESET# Must be held low at rising edge of RESET# 85 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING STAC9766/9767 V 7.4 12/06 STAC9766/9767 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING PC AUDIO 12.ORDERING INFORMATION 12.1. STAC9766/9767 Family Options and Part Order Numbers Table 34. STAC9766/9767 Ordering Information Part Order Number Supply Range Package STAC9766XXTAEyyX STAC9767XXTAEyyX DVdd = 3.3V, AVdd = 5.0V DVdd = 3.3V, AVdd = 3.3V 48-pin RoHS QFP 7mm x 7mm x 1.4mm 48-pin RoHS QFP 7mm x 7mm x 1.4mm NOTE: When ordering these parts the “yy” will be replaced with the CODEC revision. Add an “R” to the end of any of these part numbers for delivery on Tape and Reel. The minimum order quantity for Tape and Reel is 2,000 units for both package options. IDT™ 86 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING STAC9766/9767 V 7.4 12/06 STAC9766/9767 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING PC AUDIO 13.PIN DESCRIPTION 36 35 34 33 32 31 30 29 28 27 26 25 LINE_OUT_R LINE_OUT_L NC NC CAP2 NC AFILT2 AFILT1 VREFout VREF AVss1 AVdd1 Figure 24. Pin Description Drawing 37 38 39 40 41 42 43 44 45 46 47 48 48-Pin TQFP 24 23 22 21 20 19 18 17 16 15 14 13 LINE_IN_R LINE_IN_L MIC2 MIC1 CD_R CD_GND CD_L VIDEO_R VIDEO_L AUX_R AUX_L PHONE DVdd1 1 XTL_IN 2 XTL_OUT 3 DVss1 4 SDATA_OUT 5 BIT_CLK 6 DVss2 7 SDATA_IN 8 DVdd2 9 SYNC 10 RESET# 11 PC_BEEP 12 MONO_OUT AVdd2 HP_OUT_L HP_COMM HP_OUT_R AVss2 GPIO0 GPIO1 CID0 CID1 EAPD SPDIF Pin 48: To Enable SPDIF, use a 1KΩ - 1 0 KΩ external pulldown. To Disable SPDIF, use a 1 KΩ - 1 0 KΩ external pullup. Do NOT leave Pin 48 floating. The CD_GND signal is an AC signal return for the two CD input channels. It is normally biased at about 2.5V. The name of the pin in the AC97 specification is CD_GND, and this has confused many designers. It should not have any DC path to GND. Connecting the CD_GND signal directly to ground will change the internal bias of the entire CODEC, and cause significant distortion. If there is no analog CD input, then this pin can be No-Connect. IDT™ 87 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING STAC9766/9767 V 7.4 12/06 STAC9766/9767 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING PC AUDIO 13.1. Digital I/O These signals connect the STAC9766/9767 to its AC'97 controller counterpart, an external crystal, multi-CODEC selection and external audio amplifier. Table 35. Digital Connection Signals Pin Name Pin # Type XTL_IN 2 I XTL_OUT 3 I/O SDATA_OUT 5 I BIT_CLK 6 I/O 12.288 MHz serial data clock SDATA_IN 8 O Serial, time division multiplexed, AC'97 output stream SYNC 10 I 48 KHz fixed rate sample sync RESET# 11 I AC'97 Master H/W Reset No Connect 31 I IDT Internal Test mode only. No Connect 33 I IDT Internal Test mode only No Connect 34 I/O IDT Internal Test mode only GPIO0 43 I/O General Purpose I/O GPIO1 44 I/O General Purpose I/O CID0 45 I Multi-CODEC ID select – bit 0 CID1 46 I Multi-CODEC ID select – bit 1 EAPD 47 I/O External Amplifier Power Down/GPIO I/O SPDIF digital output Pin 48: To Enable SPDIF, use a 1KΩ - 1 0 KΩ external pulldown. To Disable SPDIF, use a 1KΩ - 1 0 KΩ external pullup. Do NOT leave Pin 48 floating. SPDIF 48 Description 24.576 MHz Crystal or External Clock Source 24.576 MHz Crystal Serial, time division multiplexed, AC'97 input stream 13.2. Filter/References These signals are connected to resistors, capacitors, or specific voltages. Table 36. Filtering and Voltage References IDT™ Signal Name Pin Number Type Description VREF 27 O Analog ground (0.45*Vdd, at 5V; 0.41*Vdd at 3V) VREFOUT 28 O Reference Voltage out 5mA drive (intended for mic bias) (~Vdd/2) AFILT1 29 O Anti-Aliasing Filter Cap - ADC left channel AFILT2 30 O Anti-Aliasing Filter Cap - ADC right channel CAP2 32 O ADC Reference Cap 88 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING STAC9766/9767 V 7.4 12/06 STAC9766/9767 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING PC AUDIO 13.3. Analog I/O These signals connect the STAC9766/9767 to analog sources and sinks, including microphones and speakers. Table 37. Analog Connection Signals Pin Name Pin # Type Description PC-BEEP 12 I* PC Speaker beep pass-through PHONE 13 I* From telephony subsystem speakerphone AUX_L 14 I* Aux Left Channel AUX_R 15 I* Aux Right Channel VIDEO_L 16 I* Video Audio Left Channel VIDEO_R 17 I* Video Audio Right Channel CD_L 18 I* CD Audio Left Channel CD_GND† 19 I* CD Audio analog signal return CD_R 20 I* CD Audio Right Channel MIC1 21 I* Desktop Stereo or Mono Microphone Input MIC2 22 I* Stereo or Second Mono Microphone Input LINE_IN_L 23 I* Line In Left Channel LINE_IN_R 24 I* Line In Right Channel LINE_OUT_L 35 O Line Out Left Channel LINE_OUT_R 36 O Line Out Right Channel MONO_OUT 37 O To telephony subsystem speakerphone HP_OUT_L 39 O Headphone Out Left Channel HP_COMM 40 O Headphone Ground Return HP_OUT_R 41 O Headphone Out Right Channel † Note: * Any unused input pins should be tied together through a capacitor (0.1 µF suggested) to ground, except the MIC inputs which should have their own capacitor to ground if not used. Note: † The CD_GND signal is an AC signal return for the two CD input channels. It is normally biased at about 2.5V. The name of the pin in the AC97 specification is CD_GND, and this has confused many designers. It should not have any DC path to GND. Connecting the CD_GND signal directly to ground will change the internal bias of the entire CODEC, and cause significant distortion. If there is no analog CD input, then this pin can be No-Connect. IDT™ 89 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING STAC9766/9767 V 7.4 12/06 STAC9766/9767 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING PC AUDIO 13.4. Power and Ground Signals Table 38. Power and Ground Signals IDT™ Pin Name Pin # Type Description AVdd1 25 I Analog Vdd = 5.0 V or 3.3 V AVdd2 38 I Analog Vdd = 5.0 V or 3.3 V AVss1 26 I Analog Gnd AVss2 42 I Analog Gnd DVdd1 1 I Digital Vdd = 3.3 V DVdd2 9 I Digital Vdd = 3.3 V DVss1 4 I Digital Gnd DVss2 7 I Digital Gnd 90 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING STAC9766/9767 V 7.4 12/06 STAC9766/9767 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING PC AUDIO 14.PACKAGE DRAWING 14.1. 48-Pin LQFP Figure 25. 48-Pin LQFP Package Outline and Package Dimensions A2 D Key A A1 D1 E1 E b 48 pin LQFP e LQFP Dimensions in mm Min Nom Max A 1.40 1.50 1.60 A1 0.05 0.10 0.15 A2 1.35 1.40 1.45 D 8.80 9.00 9.20 D1 6.90 7.00 7.10 E 8.80 9.00 9.20 E1 6.90 7.00 7.10 L 0.45 0.60 0.75 e Pin 1 0.50 C 0.09 - 0.20 b 0.17 0.22 0.27 c IDT™ 91 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING STAC9766/9767 V 7.4 12/06 STAC9766/9767 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING PC AUDIO 15.SOLDER REFLOW PROFILE 15.1. Standard Reflow Profile Data Note: These devices can be hand soldered at 360 o C for 3 to 5 seconds. FROM: IPC / JEDEC J-STD-020C “Moisture/Reflow Sensitivity Classification for Nonhermetic Solid State Surface Mount Devices” (www.jedec.org/download). Profile Feature Pb Free Assembly Average Ramp-Up Rate (Tsmax - Tp) 3 oC / second max Preheat Temperature Min (Tsmin ) Temperature Max (Tsmax) Time (tsmin - tsmax) 150 o C 200 o C 60 - 180 seconds Time maintained above Temperature (TL ) Time (tL ) 217 o C 60 - 150 seconds Peak / Classification Temperature (Tp) Time within 5 o C of actual Peak Temperature (tp) Ramp-Down rate Time 25 o C to Peak Temperature See “Package Classification Reflow Temperatures” on page 93. 20 - 40 seconds 6 oC / second max 8 minutes max Note: All temperatures refer to topside of the package, measured on the package body surface. Figure 26. Solder Reflow Profile IDT™ 92 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING STAC9766/9767 V 7.4 12/06 STAC9766/9767 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING PC AUDIO 15.2. Pb Free Process - Package Classification Reflow Temperatures IDT™ Package Type MSL Reflow Temperature LQFP 48-pin 3 260 oC 93 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING STAC9766/9767 V 7.4 12/06 STAC9766/9767 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING PC AUDIO 16.APPENDIX A: PROGRAMMING REGISTERS Reg # Name D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 Default 00h Reset RSRVD SE4 SE3 SE2 SE1 SE0 ID9 ID8 ID7 ID6 ID5 ID4 ID3 ID2 ID1 ID0 6A90h 02h Master Volume Mute RSVD ML5 ML4 ML3 ML2 ML1 ML0 RSVD MR5 MR4 MR3 MR2 MR1 MR0 8000h 04h HP_OUT Mixer Volume Mute RSVD HPL5 HPL4 HPL3 HPL2 HPL1 HPL0 RSVD HPR5 HPR4 HPR3 HPR2 HPR1 HPR0 8000h 06h Master Volume Mono Mute MM5 MM4 MM3 MM2 MM1 MM0 8000h 0Ah PC_BEEP Volume Mute F0 PV3 PV2 PV1 PV0 RSRVD 0000h 0Ch Phone Volume Mute GN4 GN3 GN2 GN1 GN0 8008h 0Eh Mic Volume Mute GN4 GN3 GN2 GN1 GN0 8008h 10h Line In Volume Mute RSVD GL4 GL3 GL2 GL1 GL0 RSVD GR4 GR3 GR2 GR1 GR0 8808h 12h CD Volume Mute RSVD GL4 GL3 GL2 GL1 GL0 RSVD GR4 GR3 GR2 GR1 GR0 8808h 14h Video Volume Mute RSVD GL4 GL3 GL2 GL1 GL0 RSVD GR4 GR3 GR2 GR1 GR0 8808h 16h AUX Volume Mute RSVD GL4 GL3 GL2 GL1 GL0 RSVD GR4 GR3 GR2 GR1 GR0 8808h 18h PCM Out Volume Mute RSVD GL4 GL3 GL2 GL1 GL0 RSVD GR4 GR3 GR2 GR1 GR0 8808h 1Ah Record Select SL2 SL1 SL0 SR2 SR1 SR0 0000h 1Ch Record Gain Mute GL2 GL1 GL0 GR2 GR1 GR0 8000h 20h General Purpose POP BYP MIX MS 22h 3D Control 24h Audio Int. & Paging I4 I3 I2 I1 I0 26h Powerdown Ctrl/Stat EAPD PR6 PR5 PR4 PR3 28h Extended Audio ID ID1 ID0 2Ah Extended Audio Control /Status VCFG 2Ch PCM DAC Rate SR15 SR14 SR13 SR12 SR11 SR10 SR9 32h PCM LR ADC Rate SR15 SR14 SR13 SR12 SR11 SR10 3Ah SPDIF Control V DRS SPSR1 SPSR2 L CC6 3Eh Extended Modem Status 4Ch GPIO Pin Config RSVD GC1 GC0 (GPIO1) (GPIO0) 0300h 4Eh GPIO Pin Polarity/Type RSVD GP1 GP0 FFFFh (GPIO1) (GPIO0) 50h GPIO Pin Sticky RSVD GS1 GS0 0000h (GPIO1) (GPIO0) 52h GPIO Pin Mask RSVD GW1 GW0 (GPIO1) (GPIO0) 0000h 54h GPIO Pin Status RSVD GI1 GI0 0000h (GPIO1) (GPIO0) 60h Page 01h CODEC Class/Rev RSVD X X F7 F6 64h IDT™ F F3 F2 F1 RSVD RSVD RSVD RSVD RSRVD GL3 3D BOOSTEN RSVD RSVD RSVD RSVD GR3 LPBK RSVD RSVD RSVD REV1 PRL/RSVD PRK/RSVD PRJ/RSVD PRI/RSVD RSVD PR2 PR1 RSVD PR0 RSVD CL4 CL3 PVI12 PVI11 DP3 DP2 PG3 PG2 PG1 PG0 0000h REF ANL DAC ADC 000Fh DRA VRA 0A05h DRA/ RSVD VRA 0400h* 0000h CDAC SPCV MADC/ LDAC/ RSVD RSVD SDAC/ RSVD CDAC/ RSVD SR8 SR7 SR6 SR5 SR4 SR3 SR2 SR1 SR0 BB80h SR9 SR8 SR7 SR6 SR5 SR4 SR3 SR2 SR1 SR0 BB80h CC5 CC4 CC3 CC2 CC1 CC0 PRE COPY #PCM/ AUDIO PRO 2000h GPIO 0100h CL2 CL1 CL0 DSA0 RSVD SPDIF RSVD SDAC PRA DSA1 0000h REV0 AMAP LDAC RSVD 62h 62h Page 01h F5 SPSA1 SPSA0 VRM/ SPDIF RSVD RSVD RV7 RV6 RV5 RV4 RV3 RV2 RV1 RV0 12xxh PVI6 PVI5 PVI4 PVI3 PVI2 PVI1 PVI0 FFFFh VENDOR RESERVED PCI SVID PVI15 PVI14 PVI13 PVI10 PVI9 PVI8 PVI7 VENDOR RESERVED 94 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING STAC9766/9767 V 7.4 12/06 STAC9766/9767 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING PC AUDIO Reg # Name D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 Default 64h Page 01h PCI SID PI15 PI14 PI13 PI12 PI11 PI10 PI9 PI8 PI7 PI6 PI5 PI4 PI3 PI2 PI1 PI0 FFFFh FC3 FC2 FC1 FC0 T/R 0000h FIP xxxxh 66h 66h Page 01h VENDOR RESERVED Function Select RSVD 68h VENDOR RESERVED 68h Page 01h Function Information 6Ah Digital Audio Control 6Ah Page 01h Sense Details ST2 ST1 ST0 S4 S3 S2 S1 S0 OR1 OR0 SR5 SR4 6Ch Revision Code 0 0 0 0 0 0 0 0 0 0 0 MUTE FIX DISBLE ADC slot1 G4 G3 G2 G1 G0 INV DL4 DL2 DL1 DL0 IV RSVD RSVD 6Ch Page 01h 6Eh DL3 SPOR DO1 RSVD 0000h SR3 SR2 SR1 SR0 NA 0 x x x x 00xxh ADC slot0 RSVD MIC GAIN VALUE SPLY OVR EN SPLY OVR VAL 1000h RSVD Analog Special AC97 ALL MIX RSVD RSVD 6Eh Page 01h RSVD 70h VENDOR RESERVED 72h Analog Current Adjust 74h EAPD Access RSVD EAPD RESERVED 0000h INT APOP EAPD_OEN 76h RSVD RSVD 0000h INTDIS GPIO ACC GPIO SLT12 VENDOR RESERVED 0800h 0000h 78h* High Pass Filter Bypass ADC HPF BYP 78h* Stereo Mic Enable 7Ah RSVD 7Ch Vendor ID1 1 0 0 0 0 0 1 1 1 0 0 0 0 1 0 0 8384 h 7Eh Vendor ID2 9766 0 1 1 1 0 1 1 0 0 1 1 0 0 1 1 0 7666h RSVD RSVD STEREO_MIC RSVD 0000h 0000h RSVD 0000h *depends upon chip ID IDT™ 95 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING STAC9766/9767 V 7.4 12/06 STAC9766/9767 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING PC AUDIO 17.REVISION HISTORY Revision Date History not included in Datasheet 7.1 7.2 October 2003 7.3 03 November 2006 7.4 Dec 2006 IDT™ Description of Change Removed BIT_CLK as an input option from clocking table, it was incorrectly included in 3-1 version Added CD_GND elaboration note on connection diagram, pin list and pin out diagrams: “The CD_GND signal is an AC signal return for the two CD input channels. It is normally biased at about 2.5V. The name of the pin in the AC’97 specification is CD_GND, and this has confused many designers. It should not have any DC path to GND. Connecting the CD_GND signal directly to ground will change the internal bias of the entire CODEC, and cause significant distortion. If there is no analog CD input, then this pin can be No-Connect.” Released in IDT format. corrected orderable part number 96 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING STAC9766/9767 V 7.4 12/06 STAC9766/9767 TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING PC AUDIO Innovate with IDT audio for high fidelity. Contact: www.IDT.com For Sales For Tech Support 800-345-7015 408-284-8200 HA.CM@idt.com Fax: 408-284-2775 Corporate Headquarters Europe Integrated Device Technology, Inc. 6024 Silver Creek Valley Road IDT Europe, Limited Prime House San Jose, CA 95138 United States 800 345 7015 Barnett Wood Lane Leatherhead, Surrey United Kingdom KT22 7DE +408 284 8200 (outside U.S.) +44 1372 363 339 © 2006 Integrated Device Technology, Inc. All rights reserved. Product specifications subject to change without notice. IDT and the IDT logo are trademarks of Integrated Device Technology, Inc. Accelerated Thinking is a service mark of Integrated Device Technology, Inc. All other brands, product names and marks are or may be trademarks or registered trademarks used to identify products or services of their respective owners.
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