CS4201

CS4202 Audio Codec ’97 with Headphone Amplifier Features ! AC ! Sample ’97 2.2 Compliant ! Exceeds the Microsoft® PC 2001 Audio Performance Requirements High-Performance Headphone Amplifier ! Integrated ! On-chip PLL for use with External Clock Rate Converters ! Three Analog Line-level Stereo Inputs ! High Quality Pseudo-Differential CD Input ! Two Analog Line-level Mono Inputs ! Dual Microphone Inputs ! Stereo and Mono Line-level Outputs ! Extensive Power Management Support Sources ! Integrated ! Automatic Description The CS4202 is an AC ’97 2.2 compliant stereo audio codec designed for PC multimedia systems. It uses industry leading delta-sigma and mixed signal technology. This advanced technology and these features are designed to help enable the design of PC 99 and PC 2001 compliant high-quality audio systems for desktop, portable, and entertainment PCs. Coupling the CS4202 with a PCI audio accelerator or core logic supporting the AC ’97 interface implements a cost effective, superior quality audio solution. The CS4202 surpasses PC 99, PC 2001, and AC ’97 2.2 audio quality standards. ORDERING INFO CS4202-JQZ, Lead Free 48-pin TQFP 9x9x1.4 mm High-Performance Microphone Pre-Amplifier Jack Sense through GPIO Interface for Audio Feature Configuration through Software ! BIOS-Driver ! S/PDIF Digital Audio Output ! I2S Serial Digital Outputs Enable ! Independent ! 20-bit ! 18-bit Cost Effective Six Channel Applications Simultaneous S/PDIF and Six Channel Audio Playback Stereo Digital-to-Analog Converters Stereo Analog-to-Digital Converters AC-LINK AND AC '97 REGISTERS ANALOG INPUT MUX AND OUTPUT MIXER TEST PWR MGT SRC LINE PCM_DATA 18 bit ADC INPUT MUX SYNC BIT_CLK SDATA_OUT SDATA_IN RESET# ID0# ID1# ACLINK CD AUX VIDEO MIC1 MIC2 PHONE PC_BEEP INPUT MIXER GAIN / MUTE CONTROLS MIXER / MUX SELECTS AC '97 REGISTERS Σ OUTPUT MIXER EAPD SPDIF_OUT GPIO[4:0] SDOUT,LRCLK,SCLK GPIO, S/PDIF SERIAL DATA PORT SRC LINE_OUT HP_OUT MONO_OUT PCM_DATA 20 bit DAC Σ Preliminary Product Information http://www.cirrus.com This document contains information for a new product. Cirrus Logic reserves the right to modify this product without notice. Copyright © Cirrus Logic, Inc. 2005 (All Rights Reserved) JULY '05 DS549PP2 1 CS4202 TABLE OF CONTENTS 1. CHARACTERISTICS AND SPECIFICATIONS ........................................................................ 7 ANALOG CHARACTERISTICS ................................................................................................ 7 ABSOLUTE MAXIMUM RATINGS ........................................................................................... 8 RECOMMENDED OPERATING CONDITIONS ....................................................................... 8 AC ’97 SERIAL PORT TIMING............................................................................................... 10 2. GENERAL DESCRIPTION ..................................................................................................... 13 2.1 AC-Link ............................................................................................................................ 13 2.2 Control Registers ............................................................................................................. 14 2.3 Sample Rate Converters .................................................................................................. 14 2.4 Mixers .............................................................................................................................. 14 2.5 Input Mux ......................................................................................................................... 14 2.6 Volume Control ................................................................................................................ 14 3. AC-LINK FRAME DEFINITION .............................................................................................. 16 3.1 AC-Link Serial Data Output Frame .................................................................................. 17 3.1.1 Serial Data Output Slot Tags (Slot 0)............................................................................. 17 3.1.2 Command Address Port (Slot 1) .................................................................................... 17 3.1.3 Command Data Port (Slot 2).......................................................................................... 18 3.1.4 PCM Playback Data (Slots 3-4,6-11) ............................................................................. 18 3.1.5 GPIO Pin Control (Slot12).............................................................................................. 18 3.2 AC-Link Serial Data Input Frame ..................................................................................... 19 3.2.1 Serial Data Input Slot Tag Bits (Slot 0) ........................................................................ 19 3.2.2 Status Address Port (Slot 1) .......................................................................................... 19 3.2.3 Status Data Port (Slot 2) ................................................................................................ 20 3.2.4 PCM Capture Data (Slot 3-4,6-8,11).............................................................................. 20 3.2.5 GPIO Pin Status (Slot 12) ............................................................................................. 20 3.3 AC-Link Protocol Violation - Loss of SYNC ..................................................................... 21 4. REGISTER INTERFACE ..................................................................................................... 22 4.1 Reset Register (Index 00h) .............................................................................................. 23 4.2 Analog Mixer Output Volume Registers (Index 02h - 04h) .............................................. 23 4.3 Mono Volume Register (Index 06h) .................................................................................. 24 Contacting Cirrus Logic Support For a complete listing of Direct Sales, Distributor, and Sales Representative contacts, visit the Cirrus Logic web site at: http://www.cirrus.com/corporate/contacts/sales.cfm IMPORTANT NOTICE "Preliminary" product information describes products that are in production, but for which full characterization data is not yet available. Cirrus Logic, Inc. and its subsidiaries ("Cirrus") believe that the information contained in this document is accurate and reliable. However, the information is subject to change without notice and is provided "AS IS" without warranty of any kind (express or implied). Customers are advised to obtain the latest version of relevant information to verify, before placing orders, that information being relied on is current and complete. All products are sold subject to the terms and conditions of sale supplied at the time of order acknowledgment, including those pertaining to warranty, indemnification, and limitation of liability. No responsibility is assumed by Cirrus for the use of this information, including use of this information as the basis for manufacture or sale of any items, or for infringement of patents or other rights of third parties. This document is the property of Cirrus and by furnishing this information, Cirrus grants no license, express or implied under any patents, mask work rights, copyrights, trademarks, trade secrets or other intellectual property rights. Cirrus owns the copyrights associated with the information contained herein and gives consent for copies to be made of the information only for use within your organization with respect to Cirrus integrated circuits or other products of Cirrus. This consent does not extend to other copying such as copying for general distribution, advertising or promotional purposes, or for creating any work for resale. CERTAIN APPLICATIONS USING SEMICONDUCTOR PRODUCTS MAY INVOLVE POTENTIAL RISKS OF DEATH, PERSONAL INJURY, OR SEVERE PROPERTY OR ENVIRONMENTAL DAMAGE (“CRITICAL APPLICATIONS”). CIRRUS PRODUCTS ARE NOT DESIGNED, AUTHORIZED OR WARRANTED FOR USE IN AIRCRAFT SYSTEMS, MILITARY APPLICATIONS, PRODUCTS SURGICALLY IMPLANTED INTO THE BODY, AUTOMOTIVE SAFETY OR SECURITY DEVICES, LIFE SUPPORT PRODUCTS OR OTHER CRITICAL APPLICATIONS. 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All other brand and product names in this document may be trademarks or service marks of their respective owners. 2 DS549PP2 CS4202 4.4 PC_BEEP Volume Register (Index 0Ah) .......................................................................... 24 4.5 Phone Volume Register (Index 0Ch) ................................................................................ 24 4.6 Microphone Volume Register (Index 0Eh)........................................................................ 25 4.7 Analog Mixer Input Gain Registers (Index 10h - 18h) ...................................................... 26 4.8 Input Mux Select Register (Index 1Ah) ............................................................................. 27 4.9 Record Gain Register (Index 1Ch) ................................................................................... 28 4.10 General Purpose Register (Index 20h) ......................................................................... 29 4.11 Powerdown Control/Status Register (Index 26h) ........................................................... 30 4.12 Extended Audio ID Register (Index 28h) ........................................................................ 31 4.13 Extended Audio Status/Control Register (Index 2Ah) .................................................... 32 4.14 Audio Sample Rate Control Registers (Index 2Ch - 32h) ............................................... 33 4.15 S/PDIF Control Register (Index 3Ah) ............................................................................. 34 4.16 Extended Modem ID Register (Index 3Ch) .................................................................... 35 4.17 Extended Modem Status/Control Register (Index 3Eh) ................................................. 35 4.18 GPIO Pin Configuration Register (Index 4Ch) ................................................................ 35 4.19 GPIO Pin Polarity/Type Configuration Register (Index 4Eh) .......................................... 36 4.20 GPIO Pin Sticky Register (Index 50h) ............................................................................ 36 4.21 GPIO Pin Wakeup Mask Register (Index 52h) ............................................................... 37 4.22 GPIO Pin Status Register (Index 54h)............................................................................ 37 4.23 AC Mode Control Register (Index 5Eh) .......................................................................... 37 4.24 Misc. Crystal Control Register (Index 60h) ..................................................................... 39 4.25 Serial Port Control Register (Index 6Ah) ........................................................................ 40 4.26 BIOS-Driver Interface Control Registers (Index 70h - 72h) ............................................ 41 4.27 BIOS-Driver Interface Status Register (Index 7Ah) ........................................................ 41 4.28 Vendor ID1 Register (Index 7Ch) ................................................................................... 42 4.29 Vendor ID2 Register (Index 7Eh) ................................................................................... 42 5. SERIAL DATA PORTS ........................................................................................................... 43 5.1 Overview .......................................................................................................................... 43 5.2 Multi-Channel Expansion ................................................................................................. 43 5.3 Serial Data Formats ......................................................................................................... 44 6. SONY/PHILIPS DIGITAL INTERFACE (S/PDIF) ................................................................... 45 7. EXCLUSIVE FUNCTIONS ...................................................................................................... 45 8. POWER MANAGEMENT ....................................................................................................... 46 8.1 AC ’97 Reset Modes ........................................................................................................ 46 8.1.1 Cold Reset .......................................................................................................... 46 8.1.2 Warm Reset ........................................................................................................ 46 8.1.3 New Warm Reset ................................................................................................ 46 8.1.4 Register Reset .................................................................................................... 46 8.2 Powerdown Controls ....................................................................................................... 47 9. CLOCKING ............................................................................................................................. 49 9.1 PLL Operation (External Clock) ....................................................................................... 49 9.2 24.576 MHz Crystal Operation ........................................................................................ 49 9.3 Secondary Codec Operation ........................................................................................... 49 10. ANALOG HARDWARE DESCRIPTION ............................................................................... 51 10.1 Analog Inputs ................................................................................................................. 51 10.1.1 Line Inputs ........................................................................................................ 51 10.1.2 CD Input ............................................................................................................ 51 10.1.3 Microphone Inputs ............................................................................................ 51 10.1.4 PC Beep Input ................................................................................................... 52 10.1.5 Phone Input ....................................................................................................... 52 10.2 Analog Outputs .............................................................................................................. 52 10.2.1 Stereo Outputs .................................................................................................. 52 10.2.2 Mono Output ..................................................................................................... 53 10.3 Miscellaneous Analog Signals ....................................................................................... 53 DS549PP2 3 CS4202 10.4 Power Supplies .............................................................................................................. 53 10.5 Reference Design .......................................................................................................... 53 11. GROUNDING AND LAYOUT .............................................................................................. 54 12. PIN DESCRIPTIONS 14. REFERENCE DESIGN ........................................................................................................ 56 ................................................................................................... 64 13. PARAMETER AND TERM DEFINITIONS ............................................................................ 62 15. REFERENCES ...................................................................................................................... 65 16. PACKAGE DIMENSIONS ..................................................................................................... 66 LIST OF FIGURES Figure 1. Power Up Timing............................................................................................................ 11 Figure 2. Codec Ready from Start-up or Fault Condition .............................................................. 11 Figure 3. Clocks ............................................................................................................................ 11 Figure 4. Data Setup and Hold...................................................................................................... 12 Figure 5. PR4 Powerdown and Warm Reset ................................................................................ 12 Figure 6. Test Mode ...................................................................................................................... 12 Figure 7. AC-link Connections....................................................................................................... 13 Figure 8. CS4202 Mixer Diagram.................................................................................................. 15 Figure 9. AC-link Input and Output Framing.................................................................................. 16 Figure 10. Serial Data Port: Six Channel Circuit ........................................................................... 43 Figure 11. Serial Data Format 0 (I2S) ........................................................................................... 44 Figure 12. Serial Data Format 1 (Left Justified) ............................................................................ 44 Figure 13. Serial Data Format 2 (Right Justified, 20-bit data) ....................................................... 44 Figure 14. Serial Data Format 3 (Right Justified, 16-bit data) ....................................................... 44 Figure 15. S/PDIF Output.............................................................................................................. 45 Figure 16. PLL External Loop Filter............................................................................................... 49 Figure 17. External Crystal............................................................................................................ 50 Figure 18. Line Input (Replicate for Video and AUX) .................................................................... 51 Figure 19. Differential 1 VRMS CD Input ...................................................................................... 51 Figure 20. Microphone Input ......................................................................................................... 52 Figure 21. PC_BEEP Input............................................................................................................ 52 Figure 22. Modem Connection ...................................................................................................... 52 Figure 23. Line Out and Headphone Out Setup............................................................................ 53 Figure 24. Line Out/Headphone Out Setup................................................................................... 53 Figure 25. +5V Analog Voltage Regulator..................................................................................... 54 Figure 26. Conceptual Layout for the CS4202 when in XTAL or OSC Clocking Modes ............... 55 Figure 27. Pin Locations for the CS4202 ...................................................................................... 56 Figure 28. CS4202 Reference Design .......................................................................................... 64 4 DS549PP2 CS4202 LIST OF TABLES Table 1. Register Overview for the CS4202 ..................................................................... 22 Table 2. Analog Mixer Output Attenuation........................................................................ 23 Table 3. Microphone Input Gain Values ........................................................................... 25 Table 4. Analog Mixer Input Gain Values ......................................................................... 26 Table 5. Analog Mixer Input Gain Register Index ............................................................. 26 Table 6. Input Mux Selection ............................................................................................ 27 Table 7. Record Gain Values ........................................................................................... 28 Table 8. Slot Mapping for the CS4202 ............................................................................. 31 Table 9. Slot Assignment Defaults ................................................................................... 31 Table 10. Directly Supported SRC Sample Rates for the CS4202................................... 33 Table 11. GPIO Input/Output Configurations.................................................................... 36 Table 12. Serial Data Format Selection............................................................................ 40 Table 13. Device ID with Corresponding Part Number..................................................... 42 Table 14. Serial Data Formats and Compatible DACs for the CS4202 ............................ 44 Table 15. Powerdown PR Bit Functions ........................................................................... 47 Table 16. Powerdown PR Function Matrix for the CS4202 .............................................. 48 Table 17. Power Consumption by Powerdown Mode for the CS4202 ............................. 48 Table 18. Clocking Configurations for the CS4202 .......................................................... 50 DS549PP2 5 CS4202 1. CHARACTERISTICS AND SPECIFICATIONS ANALOG CHARACTERISTICS (Standard test conditions unless otherwise noted: Tambient = 25° C, AVdd = 5.0 V ±5%, DVdd = 3.3 V ±5%; 1 kHz Input Sine wave; Sample Frequency, Fs = 48 kHz; ZAL=100 kΩ/ 1000 pF load for Mono and Line Outputs; CDL = 18 pF load (Note 1); Measurement bandwidth is 20 Hz - 20 kHz, 18-bit linear coding for ADC functions, 20-bit linear coding for DAC functions; Mixer registers set for unity gain. Parameter (Note 2) Symbol Path (Note 3) A-D A-D A-D A-D A-D D-A D-A A-A D-A A-D A-A A-A D-A A-D D-A CS4202-JQZ Min Typ Max Unit Full Scale Input Voltage Line Inputs Mic Inputs (10dB = 0, 20dB = 0) Mic Inputs (10dB = 1, 20dB = 0) Mic Inputs (10dB = 0, 20dB = 1) Mic Inputs (10dB = 1, 20dB = 1) Full Scale Output Voltage Line and Mono Outputs Headphone Output FR Frequency Response (Note 4) Analog Ac = ± 0.25 dB DAC Ac = ± 0.25 dB ADC Ac = ± 0.25 dB DR Dynamic Range Stereo Analog Inputs to LINE_OUT Mono Analog Input to LINE_OUT DAC Dynamic Range ADC Dynamic Range DAC SNR SNR (-20 dB FS input w/ CCIR-RMS filter on output) THD+N Total Harmonic Distortion + Noise (-3 dB FS input signal): Line Output Headphone Output DAC ADC (all inputs) Power Supply Rejection Ratio (1 kHz, 0.5 VRMS w/ 5 V DC offset) (Note 4) Interchannel Isolation Spurious Tone Input Impedance (Note 4) (Note 4) 0.91 0.91 0.283 0.091 0.0283 0.91 20 20 20 90 85 85 85 - 1.00 1.00 0.315 0.10 0.0315 1.0 1.4 95 90 90 90 70 1.13 20,000 20,000 20,000 - VRMS VRMS VRMS VRMS VRMS VRMS VRMS Hz Hz Hz dB FS A dB FS A dB FS A dB FS A dB A-A A-A D-A A-D 40 70 10 -90 -75 -87 -84 60 87 -100 - -80 -70 -80 -80 - dB FS dB FS dB FS dB FS dB dB dB FS kΩ Notes: 1. ZAL refers to the analog output pin loading and CDL refers to the digital output pin loading. 2. Parameter definitions are given in Section 13, Parameter and Term Definitions. 3. Path refers to the signal path used to generate this data. These paths are defined in Section 13, Parameter and Term Definitions. 4. This specification is guaranteed by silicon characterization; it is not production tested. 6 DS549PP2 CS4202 ANALOG CHARACTERISTICS Parameter (Note 2) External Load Impedance Line Output, Mono Output Headphone Output Output Impedance Line Output, Mono Output Headphone Output Input Capacitance Vrefout (Continued) Symbol Path (Note 3) CS4202-JQZ Min Typ Max Unit 10 32 2.3 730 0.8 5 2.4 2.5 kΩ Ω Ω Ω pF V (Note 4) (Note 4) MIXER CHARACTERISTICS Parameter Mixer Gain Range Span PC Beep Line In, Aux, CD, Video, Mic1, Mic2, Phone Mono Out, Line Out, Headphone Out ADC Gain Step Size All volume controls except PC Beep PC Beep Min Typ 45.0 46.5 46.5 22.5 1.5 3.0 Max Unit dB dB dB dB dB dB ABSOLUTE MAXIMUM RATINGS (AVss1 = AVss2 = DVss1 = DVss2 = 0 V) Parameter Power Supplies +3.3 V Digital +5 V Digital Analog (Supplies, Inputs, Outputs) (Except Supply Pins) (Except Supply Pins) Min -0.3 -0.3 -0.3 -10 -15 -0.3 -0.3 (Power Applied) 0 -65 Typ Max 5.5 5.5 5.5 1.25 10 15 AVdd+ 0.3 DVdd + 0.3 70 150 Unit V V V W mA mA V V °C °C Total Power Dissipation Input Current per Pin Output Current per Pin Analog Input voltage Digital Input voltage Ambient Temperature Storage Temperature RECOMMENDED OPERATING CONDITIONS (AVss1 = AVss2 = DVss1 = DVss2 = 0 V) Parameter Power Supplies Symbol +3.3 V Digital DVdd1, DVdd2 +5 V Digital DVdd1, DVdd2 Analog AVdd1, AVdd2 Min 3.135 4.75 4.75 0 Typ 3.3 5 5 Max 3.465 5.25 5.25 70 Unit V V V °C Operating Ambient Temperature DS549PP2 7 CS4202 DIGITAL CHARACTERISTICS (AVss1 = AVss2 = DVss1 = DVss2 = 0 V) Parameter DVdd = 3.3V Low level input voltage High level input voltage High level output voltage Low level output voltage Input Leakage Current (AC-link inputs) Output Leakage Current (Tri-stated AC-link outputs) Output buffer drive current BIT_CLK, SDATA_IN SPDIF_OUT EAPD/SCLK, GPIO0/LRCLK, GPIO1/SDOUT, GPIO2, GPIO3, GPIO4/SDO2 (Note 4) DVdd = 5.0 V Low level input voltage High level input voltage High level output voltage Low level output voltage Input Leakage Current (AC-link inputs) Output Leakage Current (Tri-stated AC-link outputs) Output buffer drive current BIT_CLK, SDATA_IN SPDIF_OUT EAPD/SCLK, GPIO0/LRCLK, GPIO1/SDOUT, GPIO2, GPIO3, GPIO4/SDO2 (Note 4) Symbol Vil Vih Voh Vol Min 2.15 3.00 -10 -10 Vil Vih Voh Vol 3.25 4.50 -10 -10 Typ 3.25 0.03 72 24 4 4.95 0.03 72 24 4 Max 0.80 0.35 10 10 0.80 0.35 10 10 Unit V V V V µA µA mA mA mA V V V V µA µA mA mA mA 8 DS549PP2 CS4202 AC ’97 SERIAL PORT TIMING Standard test conditions unless otherwise noted: Tambient = 25° C, AVdd = 5.0 V, DVdd = 3.3 V; CL = 55 pF load. Parameter RESET Timing RESET# active low pulse width RESET# inactive to BIT_CLK start-up delay Symbol Trst_low Trst2clk Min 1.0 100 36 36 8 10 0 2 2 2 2 1.0 162.8 15 Typ 4.0 4.0 2.5 62.5 12.288 81.4 40.7 40.7 48 20.8 1.3 19.5 10 4 4 0.285 285 Max 750 45 45 12 6 6 6 6 1.0 25 Unit µs µs µs ms µs µs MHz ns ps ns ns kHz µs µs µs ns ns ns ns ns ns ns µs µs ns ns ns (XTL mode) (OSC mode) (PLL mode) 1st SYNC active to CODEC READY ‘set’ Vdd stable to RESET# inactive Clocks BIT_CLK frequency BIT_CLK period BIT_CLK output jitter (depends on XTL_IN source) BIT_CLK high pulse width BIT_CLK low pulse width SYNC frequency SYNC period SYNC high pulse width SYNC low pulse width Data Setup and Hold Output propagation delay from rising edge of BIT_CLK Input setup time from falling edge of BIT_CLK Input hold time from falling edge of BIT_CLK Input signal rise time Input signal fall time Output signal rise time (Note 4) Output signal fall time (Note 4) Misc. Timing Parameters End of Slot 2 to BIT_CLK, SDATA_IN low (PR4) SYNC pulse width (PR4) Warm Reset SYNC inactive (PR4) to BIT_CLK start-up delay Setup to trailing edge of RESET# (ATE test mode) (Note 4) Rising edge of RESET# to Hi-Z delay (Note 4) Tsync2crd Tvdd2rst# Fclk Tclk_period Tclk_high Tclk_low Fsync Tsync_period Tsync_high Tsync_low Tco Tisetup Tihold Tirise Tifall Torise Tofall Ts2_pdown Tsync_pr4 Tsync2clk Tsetup2rst Toff DS549PP2 9 CS4202 BIT_CLK Trst_low RESET# Tvdd2rst# Vdd Trst2clk Figure 1. Power Up Timing BIT_CLK SYNC Tsync2crd CODEC_READY Figure 2. Codec Ready from Start-up or Fault Condition BIT_CLK Torise Tclk_high Tclk_low SYNC Tirise Tsync_high Tifall Tsync_low Tclk_period Tifall Tsync_period Figure 3. Clocks 10 DS549PP2 CS4202 BIT_CLK SDATA_IN Tco SDATA_OUT, SYNC Tisetup Tihold Figure 4. Data Setup and Hold BIT_CLK Slot 1 SDATA_OUT Write to 0x20 Slot 2 Data PR4 Ts2_pdown SDATA_IN Don't Care SYNC Tsync_pr4 Tsync2clk Figure 5. PR4 Powerdown and Warm Reset RESET# Tsetup2rst SDATA_OUT, SYNC SDATA_IN, BIT_CLK Toff Hi-Z Figure 6. Test Mode DS549PP2 11 CS4202 2. GENERAL DESCRIPTION The CS4202 is a mixed-signal serial audio codec with integrated headphone power amplifier compliant with the Intel® Audio Codec ’97 Specification, revision 2.2 [6] (referred to as AC ’97). It is designed to be paired with a digital controller, typically located on the PCI bus or integrated within the system core logic chip set. The controller is responsible for all communications between the CS4202 and the remainder of the system. The CS4202 contains two distinct functional sections: digital and analog. The digital section includes the AC-link interface, S/PDIF interface, serial data port, GPIO, power management support, and Sample Rate Converters (SRCs). The analog section includes the analog input multiplexer (mux), stereo input mixer, stereo output mixer, mono output mixer, headphone amplifier, stereo Analog-to-Digital Converters (ADCs), stereo Digital-to-Analog Converters (DACs), and their associated volume controls. 2.1 AC-Link All communication with the CS4202 is established with a 5-wire digital interface to the controller called the AC-link. This interface is shown in Figure 7. All clocking for the serial communication is synchronous to the BIT_CLK signal. BIT_CLK is generated by the primary audio codec and is used to clock the controller and any secondary audio codecs. Both input and output AC-link audio frames are organized as a sequence of 256 serial bits forming 13 groups referred to as ‘slots’. During each audio frame, data is passed bi-directionally between the CS4202 and the controller. The input frame is driven from the CS4202 on the SDATA_IN line. The output frame is driven from the controller on the SDATA_OUT line. The controller is also responsible for issuing reset commands via the RESET# signal. Following a Cold Reset, the CS4202 is responsible for notifying the controller that it is ready for operation after synchronizing its internal functions. The CS4202 AC-link signals must use the same digital supply voltage as the controller, either +5 V or +3.3 V. See Section 3, AC-Link Frame Definition, for detailed AC-link information. Digital AC'97 Controller SYNC BIT_CLK AC'97 CODEC SDATA_OUT SDATA_IN RESET# Figure 7. AC-link Connections 12 DS549PP2 CS4202 2.2 Control Registers the analog inputs to the CS4202 according to the settings in the volume control registers. The stereo output mixer sums the output of the stereo input mixer with the PC_BEEP and PHONE signals. The stereo output mix is then sent to the LINE_OUT and HP_OUT pins of the CS4202. The mono output mixer generates a monophonic sum of the left and right audio channels from the stereo input mixer. The mono output mix is then sent to the MONO_OUT pin on the CS4202. The CS4202 contains a set of AC ’97 compliant control registers, and a set of Cirrus Logic defined control registers. These registers control the basic functions and features of the CS4202. Read accesses of the control registers by the AC ’97 controller are accomplished with the requested register index in Slot 1 of a SDATA_OUT frame. The following SDATA_IN frame will contain the read data in Slot 2. Write operations are similar, with the register index in Slot 1 and the write data in Slot 2 of a SDATA_OUT frame. The function of each input and output frame is detailed in Section 3, AC-Link Frame Definition. Individual register descriptions are found in Section 4, Register Interface. 2.5 Input Mux 2.3 Sample Rate Converters The sample rate converters (SRC) provide high accuracy digital filters supporting sample frequencies other than 48 kHz to be captured from the CS4202 or played from the controller. AC ’97 requires support for two audio rates (44.1 and 48 kHz). In addition, the Intel® I/O Controller Hub (ICHx) specification [9] requires support for five more audio rates (8, 11.025, 16, 22.05, and 32 kHz). The CS4202 supports all these rates, as shown in Table 10 on page 32. The input multiplexer controls which analog input is sent to the ADCs. The output of the input mux is converted to stereo 18-bit digital PCM data and transmitted to the controller by means of the AC-link SDATA_IN signal. 2.6 Volume Control 2.4 Mixers The CS4202 input and output mixers are illustrated in Figure 8. The stereo input mixer sums together The CS4202 volume registers control analog input levels to the input mixer and analog output levels, including the master volume level. The PC_BEEP volume control uses 3 dB steps with a range of 0 dB to -45 dB attenuation. All other analog volume controls use 1.5 dB steps. The analog inputs have a mixing range of +12 dB signal gain to -34.5 dB signal attenuation. The analog output volume controls have a range of 0 dB to -46.5 dB attenuation for LINE_OUT, HP_OUT and MONO_OUT. DS549PP2 13 CS4202 PC BEEP BYPASS PC_BEEP VOL MUTE PHONE VOL MUTE MAIN D/A CONVERTERS PCM_OUT DAC MIC1 MIC2 MIC SELECT VOL BOOST MUTE ANALOG STEREO INPUT MIXER DAC DIRECT MODE MASTER VOLUME OUTPUT BUFFER VOL VOL MUTE LINE OUT MUTE LINE MUTE Σ Σ ANALOG STEREO OUTPUT MIXER VOL CD VOL MUTE HEADPHONE VOLUME HEADPHONE OUT HEADPHONE AMPLIFIER VOL VIDEO MUTE VOL MUTE MONO MIX SELECT STEREO TO MONO MIXER AUX MUTE Σ 1/2 MONO OUT SELECT MONO VOLUME MONO OUT MUTE OUTPUT BUFFER VOL VOL STEREO TO MONO MIXER Σ 1/2 MAIN ADC GAIN ADC INPUT MUX VOL MAIN A/D CONVERTERS PCM_IN MUTE ADC Figure 8. CS4202 Mixer Diagram 14 DS549PP2 CS4202 3. AC-LINK FRAME DEFINITION The AC-link is a bi-directional serial port with data organized into frames consisting of one 16-bit and twelve 20-bit time-division multiplexed slots. Slot 0 is a special reserved time slot containing 16-bits which are used for AC-link protocol infrastructure. Slots 1 through 12 contain audio or control/status data. Both the serial data output and input frames are defined from the controller perspective, not from the CS4202 perspective. The controller synchronizes the beginning of a frame with the assertion of the SYNC signal. Figure 9 shows the position of each bit location within the frame. The first bit position in a new serial data frame is F0 and the last bit position in the serial data frame is F255. When SYNC goes active (high) and is sampled active by the CS4202 (on the falling edge of BIT_CLK), both devices are synchronized to a new serial data frame. The data on the SDATA_OUT pin at this clock edge is the final bit of the previous frame’s serial data. On the next rising edge of BIT_CLK, the first bit of Slot 0 is driven by the controller on the SDATA_OUT pin. On the next falling edge of BIT_CLK, the CS4202 latches this data in as the first bit of the frame. 20.8 µ s (48 kHz) Tag Phase SYNC 12.288 MHz 81.4 ns BIT_CLK Data Phase Bit Frame Position: F255 0 F0 Valid Frame F1 Slot 1 Valid F2 Slot 2 Valid F12 Slot 12 Valid F13 F14 Codec ID1 F15 Codec ID0 F16 F35 F36 F56 F57 F76 F96 F255 SDATA_OUT 0 R/W 0 WD15 D19 D18 D19 D19 0 Bit Frame Position: F255 GPIO INT F0 Codec Ready F1 Slot 1 Valid F2 Slot 2 Valid F12 Slot 12 Valid F13 F14 F15 F16 F35 F36 F56 F57 F76 F96 F255 GPIO INT SDATA_IN 0 0 0 0 0 RD15 D19 D18 D19 D19 Slot 0 Slot 1 Slot 2 Slot 3 Slot 4 Slots 5-12 Figure 9. AC-link Input and Output Framing DS549PP2 15 CS4202 3.1 AC-Link Serial Data Output Frame In the serial data output frame, data is passed on the SDATA_OUT pin to the CS4202 from the AC ’97 controller. Figure 9 illustrates the serial port timing. The PCM playback data being passed to the CS4202 is shifted out MSB first in the most significant bits of each slot. Any PCM data from the AC ’97 controller that is not 20 bits wide should be left justified in its corresponding slot and dithered or zero-padded in the unused bit positions. Bits that are reserved should always be ‘cleared’ by the AC ’97 controller. 3.1.1 Serial Data Output Slot Tags (Slot 0) 2 Res 1 0 Codec Codec ID1 ID0 Bit 15 14 13 12 11 10 9 8 7 6 5 4 3 Valid Slot 1 Slot 2 Slot 3 Slot 4 Not Slot 6 Slot 7 Slot 8 Slot 9 Slot 10 Slot 11 Slot 12 Frame Valid Valid Valid Valid Implem Valid Valid Valid Valid Valid Valid Valid Valid Frame The Valid Frame bit determines if any of the following slots contain either valid playback data for the CS4202 or data for read/write operations. When ‘set’, at least one of the other AC-link slots contains valid data. If this bit is ‘clear’, the remainder of the frame is ignored. The Slot 1 Valid bit indicates a valid register read/write address for a primary codec. The Slot 2 Valid bit indicates valid register write data for a primary codec. The Slot [3:4,6:11] Valid bits indicate the validity of data in their corresponding serial data output slots. If a bit is ‘set’, the corresponding output slot contains valid data. If a bit is ‘cleared’, the corresponding slot will be ignored. The Slot 12 Valid bit indicates if output Slot 12 contains valid GPIO control data. The Codec ID[1:0] bits determine which codec is being accessed during the current AC-link frame. Codec ID[1:0] = 00 indicates the primary codec is being accessed. Codec ID[1:0] = 01, 10, or 11 indicates one of three possible secondary codecs is being accessed. A Codec ID value of 01, 10, or 11 also indicates a valid read/write address and/or valid register write data for a secondary codec. Slot 1 Valid Slot 2 Valid Slot [3:4,6:11] Valid Slot 12 Valid Codec ID[1:0] 3.1.2 Bit 19 R/W Command Address Port (Slot 1) 18 RI6 17 RI5 16 RI4 15 RI3 14 RI2 13 RI1 12 RI0 11 10 9 8 7 6 5 Reserved 4 3 2 1 0 R/W Read/Write. When this bit is ‘set’, a read of the AC ’97 register specified by the register index bits will occur in the AC ’97 2.x audio codec. When the bit is ‘cleared’, a write will occur. For any read or write access to occur, the Valid Frame bit (F0) must be ‘set’ and the Codec ID[1:0] bits (F[14:15]) must match the Codec ID of the AC ’97 2.x audio codec being accessed. Additionally, for a primary codec, the Slot 1 Valid bit (F1) must be ‘set’ for a read access and both the Slot 1 Valid bit (F1) and the Slot 2 Valid bit (F2) must be ‘set’ for a write access. For a secondary codec, both the Slot 1 Valid bit (F1) and the Slot 2 Valid bit (F2) must be ‘cleared’ for read and write accesses. See Figure 9 for bit frame positions. Register Index. The RI[6:0] bits contain the 7-bit register index to the AC ’97 registers in the CS4202. All registers are defined at word addressable boundaries. The RI0 bit must be ‘clear’ to access CS4202 registers. DS549PP2 RI[6:0] 16 CS4202 3.1.3 Command Data Port (Slot 2) Bit 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 WD15 WD14 WD13 WD12 WD11 WD10 WD9 WD8 WD7 WD6 WD5 WD4 WD3 WD2 WD1 WD0 3 210 Reserved WD[15:0] NOTE: Write Data. The WD[15:0] bits contain the 16-bit value to be written to the register. If an access is a read, this slot is ignored. For any write to an AC ’97 register, the write is defined to be an ‘atomic’ access. This means that when the Slot 1 Valid bit in output Slot 0 is ‘set’, the Slot 2 Valid bit in output Slot 0 should always be ‘set’ during the same audio frame. No write access may be split across 2 frames. 3.1.4 PCM Playback Data (Slots 3-4,6-11) Bit 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 PD19 PD18 PD17 PD16 PD15 PD14 PD13 PD12 PD11 PD10 PD9 PD8 PD7 PD6 PD5 PD4 PD3 PD2 PD1 PD0 PD[19:0] Playback Data. The PD[19:0] bits contain the 20-bit PCM (2’s complement) playback data for the left and right DACs, serial data ports, and/or the S/PDIF transmitter. Table 8 on page 30 lists a cross reference for each function and its respective slot. The mapping of a given slot to the DAC, serial data port, or S/PDIF transmitter is determined by the state of the DSA[1:0] bits in the Extended Audio ID Register (Index 28h) and the SPSA[1:0] bits in the Extended Audio Status/Control Register (Index 2Ah). 3.1.5 GPIO Pin Control (Slot12) 17 16 15 14 13 12 Not Implemented 11 10 9 8 7 6 5 4 GPIO4 GPIO3 GPIO2 GPIO1 GPIO0 3 2 1 Reserved 0 Bit 19 18 GPIO[4:0] GPIO Pin Control. The GPIO[4:0] bits control the CS4202 GPIO pins configured as outputs. Write accesses using GPIO pin control bits configured as outputs will be reflected on the GPIO pin output on the next AC-link frame. Write accesses using GPIO pin control bits configured as inputs will have no effect and are ignored. If the GPOC bit in the Misc. Crystal Control Register (Index 60h) is ‘set’, the bits in output Slot 12 are ignored and GPIO pins configured as outputs are controlled through the GPIO Pin Status Register (Index 54h). DS549PP2 17 CS4202 3.2 AC-Link Serial Data Input Frame In the serial data input frame, data is passed on the SDATA_IN pin from the CS4202 to the AC ’97 controller. The data format for the input frame is very similar to the output frame. Figure 9 on page 15 illustrates the serial port timing. The PCM capture data from the CS4202 is shifted out MSB first in the most significant 18 bits of each slot. The least significant 2 bits in each slot will be ‘cleared’. If the host requests PCM data from the AC ’97 Controller that is less than 18 bits wide, the controller should dither and round or just round (but not truncate) to the desired bit depth. Bits that are reserved or not implemented in the CS4202 will always be returned ‘cleared’. 3.2.1 Serial Data Input Slot Tag Bits (Slot 0) 10 0 9 8 7 Slot 6 Slot 7 Slot 8 Valid Valid Valid 6 0 5 0 4 3 Slot 11 Slot 12 Valid Valid 2 1 Reserved 0 Bit 15 14 13 12 11 Codec Slot 1 Slot 2 Slot 3 Slot 4 Ready Valid Valid Valid Valid Codec Ready Codec Ready. The Codec Ready bit indicates the readiness of the CS4202 AC-link. Immediately after a Cold Reset this bit will be ‘clear’. Once the CS4202 clocks and voltages are stable, this bit will be ‘set’. Until the Codec Ready bit is ‘set’, no AC-link transactions should be attempted by the controller. The Codec Ready bit does not indicate readiness of the DACs, ADCs, Vref, or any other analog function. Those must be checked in the Powerdown Control/Status Register (Index 26h) by the controller before any access is made to the mixer registers. Any accesses to the CS4202 while Codec Ready is ‘clear’ are ignored. The Slot 1 Valid bit indicates Slot 1 contains a valid read back address. The Slot 2 Valid bit indicates Slot 2 contains valid register read data. Slot 1 Valid Slot 2 Valid Slot [3:4,6:8,11] Valid The Slot [3:4,6:8,11] Valid bits indicate Slot [3:4,6:8,11] contains valid capture data from the CS4202 ADCs. If a bit is ‘set’, the corresponding input slot contains valid data. If a bit is ‘cleared’, the corresponding slot will be ignored. Slot 12 Valid The Slot 12 Valid bit indicates Slot 12 contains valid GPIO status data. 3.2.2 Status Address Port (Slot 1) 17 RI5 16 RI4 15 RI3 14 RI2 13 RI1 12 RI0 11 10 SR3 SR4 9 0 8 7 6 5 4 3 SR6 SR7 SR8 SR9 SR10 SR11 2 0 1 0 Reserved Bit 19 18 Res RI6 RI[6:0] Register Index. The RI[6:0] bits echo the AC ’97 register address when a register read has been requested in the previous frame. The CS4202 will only echo the register index for a read access. Write accesses will not return valid data in Slot 1. Slot Request. If SRx is ‘set’, this indicates the CS4202 SRC does not need a new sample on the next AC-link frame for that particular slot. If SRx is ‘clear’, the SRC indicates a new sample is needed on the following frame. If the VRA bit in the Extended Audio Status/Control Register (Index 2Ah) is ‘clear’, the SR[3:4,6:11] bits are always 0. When VRA is ‘set’, the SRC is enabled and the SR[3:4,6:11] bits are used to request data. DS549PP2 SR[3:4,6:11] 18 CS4202 3.2.3 Status Data Port (Slot 2) Bit 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 RD15 RD14 RD13 RD12 RD11 RD10 RD9 RD8 RD7 RD6 RD5 RD4 RD3 RD2 RD1 RD0 3 2 1 0 Reserved RD[15:0] Read Data. The RD[15:0] bits contain the register data requested by the controller from the previous read request. All read requests will return the read address in the input Slot 1 and the register data in the input Slot 2 on the following serial data frame. 3.2.4 PCM Capture Data (Slot 3-4,6-8,11) 1 0 0 0 Bit 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 CD17 CD16 CD15 CD14 CD13 CD12 CD11 CD10 CD9 CD8 CD7 CD6 CD5 CD4 CD3 CD2 CD1 CD0 CD[17:0] Capture Data. The CD [17:0] bits contain 18-bit PCM (2’s complement) capture data. The data will only be valid when the respective slot valid bit is ‘set’ in input Slot 0. The mapping of a given slot to an ADC is determined by the state of the ASA[1:0] bits in the AC Mode Control Register (index 5Eh). The definition of each slot can be found in Table 8 on page 30. 3.2.5 GPIO Pin Status (Slot 12) 17 0 16 0 15 0 14 0 13 0 12 0 11 0 10 0 9 0 0 GPIO GPIO4 GPIO3 GPIO2 GPIO1 GPIO0 Res BDI Res _INT 8 7 6 5 4 3 2 1 Bit 19 18 0 0 GPIO[4:0] GPIO Pin Status. The GPIO[4:0] bits reflect the status of the CS4202 GPIO pins configured as inputs. The pin status of GPIO pins configured as outputs will be reflected back on the GPIO[4:0] bits of input Slot 12 in the next frame. The output GPIO pins are controlled by the GPIO[4:0] pin control bits in output Slot 12. BIOS-Driver Interface. The BDI bit indicates that a BIOS event has occurred. This bit is a logic OR of all bits in the BDI Status Register (Index 7Ah) ANDed with their corresponding bit in the BDI Config Register (Index 70h). GPIO Interrupt. The GPIO_INT bit indicates that a GPIO or BDI interrupt event has occurred. The occurrence of a GPIO interrupt is determined by the GPIO interrupt requirements as outlined in the GPIO Pin Wakeup Mask Register (Index 52h) description. In this case, the GPIO_INT bit is cleared by writing a ‘0’ to the bit in the GPIO Pin Status Register (Index 54h) corresponding to the GPIO pin which generated the interrupt. The occurrence of a BDI interrupt is determined by the BDI interrupt requirements as outlined in the BDI Control Registers (Index 70h - 72h). In this case, the GPIO_INT bit is cleared by writing a ‘0’ to the bit in the BDI Status Register (Index 7Ah) that generated the interrupt. BDI GPIO_INT DS549PP2 19 CS4202 3.3 AC-Link Protocol Violation - Loss of SYNC • The SYNC signal goes active high before the 256th BIT_CLK clock period after the previous SYNC assertion. The CS4202 is designed to handle SYNC protocol violations. The following are situations where the SYNC protocol has been violated: • The SYNC signal is not sampled high for exactly 16 BIT_CLK clock cycles at the start of an audio frame. The SYNC signal is not sampled high on the 256th BIT_CLK clock period after the previous SYNC assertion. • Upon loss of synchronization with the controller, the CS4202 will ‘clear’ the Codec Ready bit in the serial data input frame until two valid frames are detected. During this detection period, the CS4202 will ignore all register reads and writes and will discontinue the transmission of PCM capture data. In addition, if the LOSM bit in the Misc. Crystal Control Register (Index 60h) is ‘set’ (default), the CS4202 will mute all analog outputs. If the LOSM bit is ‘clear’, the analog outputs will not be muted. 20 DS549PP2 CS4202 4. REGISTER INTERFACE Reg Register Name D15 D14 D13 D12 D11 D10 D9 0 Mute Mute Mute Mute Mute Mute Mute Mute Mute Mute Mute 0 Mute 0 EAPD D8 ID8 ML0 ML0 0 0 0 0 GL0 GL0 GL0 GL0 GL0 SL0 GL0 MS PR0 0 0 SR8 SR8 CC4 0 PRA 0 1 0 0 0 D7 ID7 0 0 0 0 0 0 0 0 0 0 0 0 0 LPBK D6 0 0 0 0 0 0 20dB 0 0 0 0 0 0 0 0 0 0 0 SR6 SR6 CC2 0 0 0 1 0 0 0 D5 0 MR5 MR5 MM5 0 0 0 0 0 0 0 0 0 0 0 0 D4 ID4 MR4 MR4 MM4 PV3 GN4 GN4 GR4 GR4 GR4 GR4 GR4 0 0 0 0 D3 0 MR3 MR3 MM3 PV2 GN3 GN3 GR3 GR3 GR3 GR3 GR3 0 GR3 0 REF 0 0 SR3 SR3 PRE 0 0 GC3 GP3 GS3 GW3 GI3 D2 0 MR2 MR2 MM2 PV1 GN2 GN2 GR2 GR2 GR2 GR2 GR2 SR2 GR2 0 ANL SPDIF SPDIF SR2 SR2 D1 0 MR1 MR1 MM1 PV0 GN1 GN1 GR1 GR1 GR1 GR1 GR1 SR1 GR1 0 DAC 0 0 SR1 SR1 D0 Default 0 MR0 MR0 MM0 0 GN0 GN0 GR0 GR0 GR0 GR0 GR0 SR0 GR0 0 ADC VRA VRA SR0 SR0 PRO 0 GPIO GC0 GP0 GS0 GW0 GI0 00h Reset 02h Master Volume 04h Headphone Volume 06h Mono Volume 0Ah PC_BEEP Volume 0Ch Phone Volume 0Eh Mic Volume 10h Line In Volume 12h CD Volume 14h Video Volume 16h Aux Volume 18h PCM Out Volume 1Ah Record Select 1Ch Record Gain 20h General Purpose 26h Powerdown Ctrl/Stat 28h Ext’d Audio ID 2Ah Ext’d Audio Stat/Ctrl 2Ch PCM Front DAC Rate 32h PCM L/R ADC Rate 3Ah S/PDIF Control 3Ch Ext’d Modem ID 3Eh Ext’d Modem Stat/Ctrl 4Ch GPIO Pin Config. 4Eh GPIO Pin Polarity/Type 50h GPIO Pin Sticky 52h GPIO Pin Wakeup 54h GPIO Pin Status 5Eh AC Mode Control 60h Misc. Crystal Control 6Ah Serial Port Control 70h BDI Config 72h BDI Wakeup 7Ah BDI Status 7Ch Vendor ID1 7Eh Vendor ID2 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 PR6 ID0 0 0 ML5 ML5 0 0 0 0 0 0 0 0 0 0 0 0 PR5 0 0 SR13 SR13 0 ML4 ML4 0 0 0 0 GL4 GL4 GL4 GL4 GL4 0 0 0 PR4 0 0 0 ML3 ML3 0 0 0 0 GL3 GL3 GL3 GL3 GL3 0 GL3 0 PR3 0 ML2 ML2 0 0 0 0 GL2 GL2 GL2 GL2 GL2 SL2 GL2 0 PR2 0 ML1 ML1 0 0 0 0 GL1 GL1 GL1 GL1 GL1 SL1 GL1 MIX PR1 0190h 8000h 8000h 8000h 0000h 8008h 8008h 8808h 8808h 8808h 8808h 8808h 0000h 8000h 0000h 000Fh x605h 0410h BB80h BB80h 2000h x000h 0100h 001Fh FFFFh 0000h 0000h 0000h 0000h 0003h 0000h 0000h 0000h 0000h 4352h 5971h 0 0 0 SR7 SR7 CC3 0 0 0 1 0 0 0 ID1 0 REV1 REV0 AMAP DSA1 DSA0 SPSA1 SPSA0 0 SPCV 0 SR15 SR14 SR15 SR14 V ID1 0 0 1 0 0 0 DRS ID0 0 0 1 0 0 0 SR12 SR11 SR10 SR9 SR12 SR11 SR10 SR9 L 0 0 0 1 0 0 0 CC6 0 0 0 1 0 0 0 CC5 0 0 0 1 0 0 0 SR5 SR5 CC1 0 0 0 1 0 0 0 SR4 SR4 CC0 0 0 GC4 GP4 GS4 GW4 GI4 SPSR1 SPSR0 COPY /AUDIO 0 0 GC2 GP2 GS2 GW2 GI2 0 0 GC1 GP1 GS1 GW1 GI1 0 0 0 1 0 0 0 0 0 0 1 0 0 0 Cirrus Logic Defined Registers: 0 0 SDEN 0 0 0 E14 E14 E14 F6 T6 0 0 0 E13 E13 E13 F5 T5 0 DPC 0 E12 E12 E12 F4 T4 ASPM 0 0 0 E10 E10 E10 F2 T2 TMM DDM Reserved 0 E9 E9 E9 F1 T1 0 E8 E8 E8 F0 T0 0 0 ASA1 0 0 E5 E5 E5 S5 DID1 ASA0 0 0 E4 E4 E4 S4 DID0 0 GPOC 0 0 0 LOSM SDF0 E0 E0 E0 S0 REV0 0 0 E11 E11 E11 F3 T3 10dB CRST 0 E7 E7 E7 S7 0 0 E6 E6 E6 S6 DID2 Reserved SDF1 E1 E1 E1 S1 REV1 SDO2 SDSC E3 E3 E3 S3 0 E2 E2 E2 S2 REV2 E15 E15 E15 F7 T7 Table 1. Register Overview for the CS4202 DS549PP2 21 CS4202 4.1 D15 0 Reset Register (Index 00h) D14 0 D13 0 D12 0 D11 0 D10 0 D9 0 D8 ID8 D7 ID7 D6 0 D5 0 D4 ID4 D3 0 D2 0 D1 0 D0 0 ID8 ID7 ID4 18-bit ADC Resolution. The ID8 bit is ‘set’, indicating this feature is present. 20-bit DAC resolution. The ID7 bit is ‘set’, indicating this feature is present. Headphone Out. The ID4 bit is ‘set’, indicating this feature is present. The state of this bit depends on the state of the HPCFG pin. 0190h. The data in this register is read-only data. Default Any write to this register causes a Register Reset of the audio control (Index 00h - 3Ah) and Cirrus Logic defined (Index 5Ah - 7Ah) registers. A read from this register returns configuration information about the CS4202. 4.2 D15 Mute Analog Mixer Output Volume Registers (Index 02h - 04h) D14 0 D13 ML5 D12 ML4 D11 ML3 D10 ML2 D9 ML1 D8 ML0 D7 0 D6 0 D5 MR5 D4 MR4 D3 MR3 D2 MR2 D1 MR1 D0 MR0 Mute ML[5:0] Output Mute. Setting this bit mutes the LINE_OUT_L/R or HP_OUT_L/R output signals. Output Volume Left. These bits control the left output volume. Each step corresponds to 1.5 dB gain adjustment, with a total available range from 0 dB to -46.5 dB attenuation. Setting the ML5 bit sets the left channel attenuation to -46.5 dB by forcing ML[4:0] to a ‘1’ state. ML[5:0] will read back 011111 when ML5 has been ‘set’. See Table 2 for further details. Output Volume Right. These bits control the right output volume. Each step corresponds to 1.5 dB gain adjustment, with a total available range from 0 dB to -46.5 dB attenuation. Setting the MR5 bit sets the right channel attenuation to -46.5 dB by forcing MR[4:0] to a ‘1’ state. MR[5:0] will read back 011111 when MR5 has been ‘set’. See Table 2 for further details. 8000h. This value corresponds to 0 dB attenuation and Mute ‘set’. MR[5:0] Default If the HPCFG pin is left floating, register 02h controls the Master Output Volume and register 04h controls the Headphone Output Volume. If the HPCFG pin is tied ‘low’, register 02h controls the Headphone Volume and register 04h is a read-only register and always returns 0000h when ‘read’. Mx5 - Mx0 Mx5 - Mx0 Write Read 000000 000001 … 011111 100000 ... 111111 000000 000001 … 011111 011111 ... 011111 Gain Level 0 dB -1.5 dB ... -46.5 dB -46.5 dB ... -46.5 dB Table 2. Analog Mixer Output Attenuation 22 DS549PP2 CS4202 4.3 D15 Mute Mono Volume Register (Index 06h) D14 0 D13 0 D12 0 D11 0 D10 0 D9 0 D8 0 D7 0 D6 0 D5 MM5 D4 MM4 D3 MM3 D2 MM2 D1 MM1 D0 MM0 Mute MM[5:0] Mono Mute. Setting this bit mutes the MONO_OUT output signal. Mono Volume Control. The MM[5:0] bits control the mono output volume. Each step corresponds to 1.5 dB gain adjustment, with a total available range from 0 dB to -46.5 dB attenuation. Setting the MM5 bit sets the mono attenuation to -46.5 dB by forcing MM[4:0] to a ‘1’ state. MM[5:0] will read back 011111 when MM5 has been ‘set’. See Table 2 on page 22 for further attenuation levels. 8000h. This value corresponds to 0 dB attenuation and Mute ‘set’. Default 4.4 D15 Mute PC_BEEP Volume Register (Index 0Ah) D14 0 D13 0 D12 0 D11 0 D10 0 D9 0 D8 0 D7 0 D6 0 D5 0 D4 PV3 D3 PV2 D2 PV1 D1 PV0 D0 0 Mute PV[3:0] PC_BEEP Mute. Setting this bit mutes the PC_BEEP input signal. PC_BEEP Volume Control. The PV[3:0] bits control the gain levels of the PC_BEEP input source to the Input Mixer. Each step corresponds to 3 dB gain adjustment, with 0000 = 0 dB. The total range is 0 dB to -45 dB attenuation. 0000h. This value corresponds to 0 dB attenuation and Mute ‘clear’. Default This register has no effect on the PC_BEEP volume during RESET#. 4.5 D15 Mute Phone Volume Register (Index 0Ch) D14 0 D13 0 D12 0 D11 0 D10 0 D9 0 D8 0 D7 0 D6 0 D5 0 D4 GN4 D3 GN3 D2 GN2 D1 GN1 D0 GN0 Mute GN[5:0] Phone Mute. Setting this bit mutes the Phone input signal. Phone Volume Control. The GN[4:0] bits control the gain level of the Phone input source to the Input Mixer. Each step corresponds to 1.5 dB gain adjustment, with 01000 = 0 dB. The total range is +12 dB to -34.5 dB attenuation. See Table 4 on page 25 for further attenuation levels. 8008h. This value corresponds to 0 dB attenuation and Mute ‘set’. Default DS549PP2 23 CS4202 4.6 D15 Mute Microphone Volume Register (Index 0Eh) D14 0 D13 0 D12 0 D11 0 D10 0 D9 0 D8 0 D7 0 D6 20dB D5 0 D4 GN4 D3 GN3 D2 GN2 D1 GN1 D0 GN0 Mute 20dB Microphone Mute. Setting this bit mutes the MIC1 or MIC2 signal. The selection of the MIC1 or MIC2 input pin is controlled by the MS bit in the General Purpose Register (Index 20h). Microphone 20 dB Boost. When ‘set’, the 20dB bit enables the +20 dB microphone boost block. In combination with the 10dB boost bit in the Misc. Crystal Control Register (Index 60h) this bit allows for variable boost from 0 dB to +30 dB in steps of 10 dB. Table 3 summarizes this behavior. Microphone Volume Control. The GN[4:0] bits are used to control the gain level of the Microphone input source to the Input Mixer. Each step corresponds to 1.5 dB gain adjustment, with 01000 = 0 dB. The total range is +12 dB to -34.5 dB gain. See Table 3 for further details. 8008h. This value corresponds to 0 dB gain and Mute ‘set’. Gain Level GN4 - GN0 00000 00001 … 00111 01000 01001 … 11111 10dB = 0, 20dB = 0 +12.0 dB +10.5 dB … +1.5 dB 0.0 dB -1.5 dB … -34.5 dB 10dB = 1, 20dB = 0 +22.0 dB +20.5 dB ... +11.5 dB +10.0 dB +8.5 dB ... -24.5 dB 10dB = 0, 20dB = 1 +32.0 dB +30.5 dB ... +21.5 dB +20.0 dB +18.5 dB ... -14.5 dB 10dB = 1, 20dB = 1 +42.0 dB +40.5 dB ... +31.5 dB +30.0 dB +28.5 dB ... -4.5 dB GN[4:0] Default Table 3. Microphone Input Gain Values 24 DS549PP2 CS4202 4.7 D15 Mute Analog Mixer Input Gain Registers (Index 10h - 18h) D14 0 D13 0 D12 GL4 D11 GL3 D10 GL2 D9 GL1 D8 GL0 D7 0 D6 0 D5 0 D4 GR4 D3 GR3 D2 GR2 D1 GR1 D0 GR0 Mute GL[4:0] Stereo Input Mute. Setting this bit mutes the respective input signal, both right and left inputs. Left Volume Control. The GL[4:0] bits are used to control the gain level of the left analog input source to the Input Mixer. Each step corresponds to 1.5 dB gain adjustment, with 01000 = 0 dB. The total range is +12 dB to -34.5 dB gain. See Table 4 for further details. Right Volume Control. The GR[4:0] bits are used to control the gain level of the right analog input source to the Input Mixer. Each step corresponds to 1.5 dB gain adjustment, with 01000 = 0 dB. The total range is +12 dB to -34.5 dB gain. See Table 4 for further details. 8808h. This value corresponds to 0 dB gain and Mute ‘set’. GR[4:0] Default The Analog Mixer Input Gain Registers are listed in Table 5. Gx4 - Gx0 Gain Level 00000 00001 … 00111 01000 01001 … 11111 +12.0 dB +10.5 dB … +1.5 dB 0.0 dB -1.5 dB … -34.5 dB Table 4. Analog Mixer Input Gain Values Register Index 10h 12h 14h 16h 18h Function Line In Volume CD Volume Video Volume Aux Volume PCM Out Volume Table 5. Analog Mixer Input Gain Register Index DS549PP2 25 CS4202 4.8 D15 0 Input Mux Select Register (Index 1Ah) D14 0 D13 0 D12 0 D11 0 D10 SL2 D9 SL1 D8 SL0 D7 0 D6 0 D5 0 D4 0 D3 0 D2 SR2 D1 SR1 D0 SR0 SL[2:0] SR[2:0] Default Left Channel Source. The SL[2:0] bits select the left channel source to pass to the ADCs for recording. See Table 6 for possible values. Right Channel Source. The SR[2:0] bits select the right channel source to pass to the ADCs for recording. See Table 6 for possible values. 0000h. This value selects the Mic input for both channels. Sx2 - Sx0 000 001 010 011 100 101 110 111 Record Source Mic CD Input Video Input Aux Input Line Input Stereo Mix Mono Mix Phone Input Table 6. Input Mux Selection 26 DS549PP2 CS4202 4.9 D15 Mute Record Gain Register (Index 1Ch) D14 0 D13 0 D12 0 D11 GL3 D10 GL2 D9 GL1 D8 GL0 D7 0 D6 0 D5 0 D4 0 D3 GR3 D2 GR2 D1 GR1 D0 GR0 Mute GL[3:0] Record Gain Mute. Setting this bit mutes the input to the L/R ADCs. Left ADC Gain. The GL[3:0] bits control the input gain on the left channel of the analog source, applied after the input mux and before the ADCs. Each step corresponds to 1.5 dB gain adjustment, with 0000 = 0 dB. The total range is 0 dB to +22.5 dB gain. See Table 7 for further details. Right ADC Gain. The GR[3:0] bits control the input gain on the right channel of the analog source, applied after the input mux and before the ADCs. Each step corresponds to 1.5 dB gain adjustment, with 0000 = 0 dB. The total range is 0 dB to +22.5 dB gain. See Table 7 for further details. 8000h. This value corresponds to 0 dB gain and Mute ‘set’. Gx3 - Gx0 Gain Level 1111 … 0001 0000 +22.5 dB … +1.5 dB 0 dB GR[3:0] Default Table 7. Record Gain Values DS549PP2 27 CS4202 4.10 D15 0 General Purpose Register (Index 20h) D14 0 D13 0 D12 0 D11 0 D10 0 D9 MIX D8 MS D7 LPBK D6 0 D5 0 D4 0 D3 0 D2 0 D1 0 D0 0 MIX Mono Output Path. This bit controls the source of the mono output driver. When ‘clear’, the output of the stereo-to-mono mixer is sent to the mono output. When ‘set’, the output of the microphone boost stage is sent to the mono output. The source of the stereo-to-mono mixer is controlled by the TMM bit in the AC Mode Control Register (Index 5Eh). The source of the microphone boost stage is controlled by the MS bit in the General Purpose Register (Index 20h). Microphone Select. The MS bit determines which of the two Mic inputs are passed to the mixer. When ‘set’, the MIC2 input is selected. When ‘clear’, the MIC1 input is selected. Loopback Enable. When ‘set’, the LPBK bit enables the ADC/DAC Loopback Mode. This bit routes the output of the ADCs to the input of the DACs without involving the AC-link. 0000h MS LPBK Default 28 DS549PP2 CS4202 4.11 D15 EAPD Powerdown Control/Status Register (Index 26h) D14 PR6 D13 PR5 D12 PR4 D11 PR3 D10 PR2 D9 PR1 D8 PR0 D7 0 D6 0 D5 0 D4 0 D3 REF D2 ANL D1 DAC D0 ADC EAPD External Amplifier Power Down. The EAPD pin follows this bit and is generally used to power down external amplifiers. The EAPD bit is mutually exclusive with the SDSC bit in the Serial Port Control Register (Index 6Ah). The SDSC bit must be ‘clear’ before the EAPD bit may be ‘set’. If the SDSC bit is ‘set’, EAPD is a read-only bit and always returns ‘0’. Headphone Amplifier Powerdown. When ‘set’, the headphone amplifier is powered down. Internal Clock Disable. When ‘set’, the internal master clock is disabled (BIT_CLK running). The only way to recover from setting this bit is through a Cold Reset (driving the RESET# signal active). AC-link Powerdown. When ‘set’, the AC-link is powered down (BIT_CLK off). The AC-link can be restarted through a Warm Reset using the SYNC signal, or a Cold Reset using the RESET# signal (primary audio codec only). Analog Mixer Powerdown (Vref off). When ‘set’, the analog mixer and voltage reference are powered down. When clearing this bit, the ANL, ADC, and DAC bits should be checked before writing any mixer registers. Analog Mixer Powerdown (Vref on). When ‘set’, the analog mixer is powered down (the voltage reference is still active). When clearing this bit, the ANL bit should be checked before writing any mixer registers. Front DACs Powerdown. When ‘set’, the DACs are powered down. When clearing this bit, the DAC bit should be checked before sending any data to the DACs. L/R ADCs and Input Mux Powerdown. When ‘set’, the ADCs and the ADC input muxes are powered down. When clearing this bit, no valid data will be sent down the AC-link until the ADC bit goes high. Voltage Reference Ready Status. When ‘set’, the REF bit indicates the voltage reference is at a nominal level. Analog Ready Status. When ‘set’, the analog output mixer, input multiplexer, and volume controls are ready. When ‘clear’, no volume control registers should be written. Front DAC Ready Status. When ‘set’, the DACs are ready to receive data across the AC-link. When ‘clear’, the DACs will not accept any valid data. L/R ADCs Ready Status. When ‘set’, the ADCs are ready to send data across the AC-link. When ‘clear’, no data will be sent to the controller. 000Fh. This value indicates all blocks are powered on. The lower four bits will change as the CS4202 finishes an initialization and calibration sequence. PR6 PR5 PR4 PR3 PR2 PR1 PR0 REF ANL DAC ADC Default The PR[6:0] and the EAPD bits are powerdown control for different sections of the CS4202 as well as external amplifiers. The REF, ANL, DAC, and ADC bits are read-only status bits which, when ‘set’, indicate that a particular section of the CS4202 is ready. After the controller receives the Codec Ready bit in input Slot 0, these status bits must be checked before writing to any mixer registers. See Section 8, Power Management, for more information on the powerdown functions. DS549PP2 29 CS4202 4.12 D15 ID1 Extended Audio ID Register (Index 28h) D14 ID0 D13 0 D12 0 D11 D10 D9 REV1 REV0 AMAP D8 0 D7 0 D6 0 D5 D4 DSA1 DSA0 D3 0 D2 SPDIF D1 0 D0 VRA ID[1:0] Codec ID. These bits indicate the current codec configuration. When ID[1:0] = 00, the CS4202 is the primary audio codec. When ID[1:0] = 01, 10, or 11, the CS4202 is a secondary audio codec. The state of the ID[1:0] bits is determined at power-up from the ID[1:0]# pins and the current clocking scheme, see Table 18 on page 49. AC ’97 Revision. The REV[1:0] bits indicate which version of the AC ’97 specification the codec complies with. These bits always return ‘01’, indicating the CS4202 complies with version 2.2 of the AC ’97 specification. Audio Slot Mapping. The AMAP bit indicates whether the AC ’97 2.2 compliant AC-link slot to audio DAC mapping is supported. This bit always returns ‘1’, indicating that audio slot mapping is supported. The PCM playback and capture slots are mapped according to Table 8 on page 30. Slot Assignment DSA1 DSA0 SPSA1 SPSA0 ASA1 ASA0 0 0 1 1 0 1 0 1 Slot Mapping SDO2 S/PDIF ADC L 3 7 6 10 R 4 8 9 11 L 7 6 10 R 8 9 11 L 6 10 R 9 11 L 3 7 6 10 R 4 8 9 11 L 3 7 6 R 4 8 11 - REV[1:0] AMAP DAC SDOUT Table 8. Slot Mapping for the CS4202 DSA[1:0] DAC Slot Assignment. The DSA[1:0] bits control the mapping of output slots to the DAC/SRC block as well as the serial data port. To satisfy AC ‘97 2.2 AMAP requirements, the default for these bits will depend on the Codec ID as shown in Table 9. See Table 8 for all available Slot Map settings. Codec ID 0 1 2 3 DSA[1:0] default 00 01 01 10 SPSA[1:0] default 01 10 10 11 ASA[1:0] default 00 00 00 00 Table 9. Slot Assignment Defaults SPDIF Sony/Philips Digital Interface. The SPDIF bit is ‘set’, indicating that the optional S/PDIF transmitter is supported. Variable Rate PCM Audio. The VRA bit indicates whether variable rate PCM audio is supported. This bit always returns ‘1’, indicating that variable rate PCM audio is available. x605h. The Extended Audio ID Register (Index 28h) is a read-only register, except for the DSA[1:0] bits which are read/write. DS549PP2 VRA Default 30 CS4202 4.13 D15 0 Extended Audio Status/Control Register (Index 2Ah) D14 0 D13 0 D12 0 D11 0 D10 SPCV D9 0 D8 0 D7 0 D6 0 D5 D4 SPSA1 SPSA0 D3 0 D2 SPDIF D1 0 D0 VRA SPCV S/PDIF Configuration Valid. This read-only bit indicates the status of the S/PDIF transmitter subsystem, enabling the driver to determine if the currently programmed S/PDIF configuration is supported. SPCV is always valid, independent of the S/PDIF enable bit status. S/PDIF Slot Assignment. These bits control the mapping of output slots to the S/PDIF transmitter. To satisfy AC ‘97 2.2 AMAP requirements, the default for these bits will depend on the Codec ID as shown in Table 9 on page 30. See Table 8 on page 30 for all available Slot Map settings. Enable Sony/Philips Digital Interface. This bit enables S/PDIF data transmission on the SPDIF_OUT pin. The SPDIF bit routes the left and right channel data from the AC ’97 controller or from the ADC output to the S/PDIF transmitter block. The actual data routed to the S/PDIF block are controlled through the configuration of the SPSA[1:0] bits and the ASPM bit in the AC Mode Control Register (Index 5Eh). Enable Variable Rate Audio. When ‘set’, the VRA bit allows access to the PCM Front DAC Rate Register (Index 2Ch) and the PCM L/R ADC Rate Register (Index 32h). This bit must be ‘set’ in order to use variable PCM playback or capture rates. The VRA bit also serves as a powerdown for the DAC and ADC SRC blocks. Clearing VRA will reset the PCM Front DAC Rate Register (Index 2Ch) and the PCM L/R ADC Rate Register (Index 32h) to their default values. The SRC data path is flushed and the Slot Request bits for the currently active DAC slots will be fixed at ‘0’. 0410h SPSA[1:0] SPDIF VRA Default DS549PP2 31 CS4202 4.14 D15 SR15 Audio Sample Rate Control Registers (Index 2Ch - 32h) D14 SR14 D13 SR13 D12 SR12 D11 SR11 D10 SR10 D9 SR9 D8 SR8 D7 SR7 D6 SR6 D5 SR5 D4 SR4 D3 SR3 D2 SR2 D1 SR1 D0 SR0 SR[15:0] Sample Rate Select. The Audio Sample Rate Control Registers (Index 2Ch - 32h) control playback and capture sample rates. The PCM Front DAC Rate Register (Index 2Ch) controls the Front Left and Front Right DAC sample rates. The PCM L/R ADC Rate Register (Index 32h) controls the Left and Right ADC sample rates. There are seven sample rates directly supported by this register, shown in Table 10. Any value written to this register not contained in Table 10 is not directly supported and will be decoded according to the ranges indicated in the table. The range boundaries have been chosen so that only bits SR[15:12] of each register will have to be considered. All register read transactions will reflect the actual value stored (column 2 in Table 10) and not the one attempted to be written. BB80h. This value corresponds to 48 kHz sample rate. Default Writes to the PCM Front DAC Rate Register (Index 2Ch) and the PCM L/R ADC Rate Register (Index 32h) are only available in Variable Rate PCM Audio mode when the VRA bit in the Extended Audio Status/Control Register (Index 2Ah) is ‘set’. If VRA = 0, writes to the register are ignored and the register will always read BB80h. Sample Rate (Hz) 8,000 11,025 16,000 22,050 32,000 44,100 48,000 SR[15:0], register content (hex value) 1F40 2B11 3E80 5622 7D00 AC44 BB80 SR[15:0], decode range (hex value) 0000 - 1FFF 2000 - 2FFF 3000 - 3FFF 4000 - 5FFF 6000 - 7FFF 8000 - AFFF B000 - FFFF SR[15:12], decode range (bin value) 0000 - 0001 0010 - 0010 0011 - 0011 0100 - 0101 0110 - 0111 1000 - 1010 1011 - 1111 Table 10. Directly Supported SRC Sample Rates for the CS4202 32 DS549PP2 CS4202 4.15 D15 V S/PDIF Control Register (Index 3Ah) D14 D13 D12 D11 DRS SPSR1 SPSR0 L D10 CC6 D9 CC5 D8 CC4 D7 CC3 D6 CC2 D5 CC1 D4 CC0 D3 PRE D2 D1 D0 COPY /AUDIO PRO V DRS Validity. The V bit is mapped to the V bit (bit 28) of every sub-frame. If this bit is ‘clear’, the signal is suitable for conversion or processing. Double Rate S/PDIF. The DRS bit is mapped to bit 27 of the channel status block. This bit controls support for optional higher sample rate transmission. The CS4202 does not support double rate S/PDIF transmission, therefore DRS is a read-only bit and always returns ‘0’. S/PDIF Sample Rate. The SPSR[1:0] bits are mapped to bits 24 and 25 of the channel status block. These bits control the S/PDIF transmitter clock rate. The CS4202 only supports transmission at the standard 48 kHz rate, therefore SPSR[1:0] are read-only bits and always return ‘10’. Generation Status. The L bit is mapped to bit 15 of the channel status block. For category codes 001xxxx, 0111xxx and 100xxxx, a value of ‘0’ indicates original material and a value of ‘1’ indicates a copy of original material. For all other category codes the definition of the L bit is reversed. Category Code. The CC[6:0] bits are mapped to bits 8-14 of the channel status block. Data Pre-emphasis. The PRE bit is mapped to bit 3 of the channel status block. If the PRE bit is ‘set’, 50/15 µs filter pre-emphasis is indicated. If the bit is ‘clear’, no pre-emphasis is indicated. Copyright. The COPY bit is mapped to bit 2 of the channel status block. If the COPY bit is ‘set’ copyright is not asserted and copying is permitted. Audio / Non-Audio. The /AUDIO bit is mapped to bit 1 of the channel status block. If the /AUDIO bit is ‘clear’, the data transmitted over S/PDIF is assumed to be digital audio. If the /AUDIO bit is ‘set’, non-audio data is assumed. Professional/Consumer. The PRO bit is mapped to bit 0 of the channel status block. If the PRO bit is ‘clear’, consumer use of the audio control block is indicated. If the bit is ‘set’, professional use is indicated. 2000h SPSR[1:0] L CC[6:0] PRE COPY /AUDIO PRO Default For a further discussion of the proper use of the channel status bits see application note AN22: Overview of Digital Audio Interface Data Structures [3] DS549PP2 33 CS4202 4.16 D15 ID1 Extended Modem ID Register (Index 3Ch) D14 ID0 D13 0 D12 0 D11 0 D10 0 D9 0 D8 0 D7 0 D6 0 D5 0 D4 0 D3 0 D2 0 D1 0 D0 0 ID[1:0] Codec ID. These bits indicate the current codec configuration. When ID[1:0] = 00, the CS4202 is the primary audio codec. When ID[1:0] = 01, 10, or 11, the CS4202 is a secondary audio codec. The state of the ID[1:0] bits is determined at power-up from the ID[1:0]# pins and the current clocking scheme, see Table 18 on page 49. x000h. This value indicates no supported modem functions. Default The Extended Modem ID Register (Index 3Ch) is a read/write register that identifies the CS4202 modem capabilities. Writing any value to this location issues a reset to modem registers (Index 3Ch-54h), including GPIO registers (Index 4Ch - 54h). Audio registers are not reset by a write to this location. 4.17 D15 0 Extended Modem Status/Control Register (Index 3Eh) D14 0 D13 0 D12 0 D11 0 D10 0 D9 0 D8 PRA D7 0 D6 0 D5 0 D4 0 D3 0 D2 0 D1 0 D0 GPIO PRA GPIO Powerdown. When ‘set’, the PRA bit powers down the GPIO subsystem. When the GPIO section is powered down, all outputs must be tri-stated and input Slot 12 should be marked invalid when the AC-link is active. To use any GPIO functionality PRA must be cleared first. GPIO. When ‘set’, the GPIO bit indicates the GPIO subsystem is ready for use. When ‘set’, input Slot 12 will also be marked valid. 0100h GPIO Default 4.18 D15 0 GPIO Pin Configuration Register (Index 4Ch) D14 0 D13 0 D12 0 D11 0 D10 0 D9 0 D8 0 D7 0 D6 0 D5 0 D4 GC4 D3 GC3 D2 GC2 D1 GC1 D0 GC0 GC[4:0] GPIO Pin Configuration. When ‘set’, the GC[4:0] bits define the corresponding GPIO pin as an input. When ‘clear’, the corresponding GPIO pin is defined as an output. When the SDEN bit in the Serial Port Control Register (Index 6Ah) is ‘set’, the GC[1:0] bits are read-only bits and always return ‘0’. When SDEN is ‘clear’, the GC[1:0] bits function normally. Likewise, when the SDO2 bit in the Serial Port Control Register (Index 6Ah) is 'set', the GC4 bit is a read-only bit and always returns '0'. When SDO2 is 'clear', the GC4 bit functions normally. The GC[3:2] bits have no such dependency. 001Fh. This value corresponds to all GPIO pins configured as inputs. Default After a Cold Reset or a modem Register Reset (see Extended Modem ID Register (Index 3Ch)), all GPIO pins are configured as inputs. The upper 11 bits of this register always return ‘0’. 34 DS549PP2 CS4202 4.19 D15 1 GPIO Pin Polarity/Type Configuration Register (Index 4Eh) D14 1 D13 1 D12 1 D11 1 D10 1 D9 1 D8 1 D7 1 D6 1 D5 1 D4 GP4 D3 GP3 D2 GP2 D1 GP1 D0 GP0 GP[4:0] GPIO Pin Configuration. This register defines the GPIO input polarity (0 = Active Low, 1 = Active High) when a GPIO pin is configured as an input. The GP[4:0] bits define the GPIO output type (0 = CMOS, 1 = OPEN-DRAIN) when a GPIO pin is configured as an output. The GC[4:0] bits in the GPIO Pin Configuration Register (Index 4Ch) define the GPIO pins as inputs or outputs. See Table 11 for the various GPIO configurations. FFFFh Default After a Cold Reset or a modem Register Reset this register defaults to all 1’s. The upper 11 bits of this register always return ‘1’. GCx GPx Function 0 0 1 1 0 1 0 1 Output Output Input Input Configuration CMOS Drive Open Drain Active Low Active High (default) Table 11. GPIO Input/Output Configurations 4.20 D15 0 GPIO Pin Sticky Register (Index 50h) D14 0 D13 0 D12 0 D11 0 D10 0 D9 0 D8 0 D7 0 D6 0 D5 0 D4 GS4 D3 GS3 D2 GS2 D1 GS1 D0 GS0 GS[4:0] GPIO Pin Sticky. This register defines the GPIO input type (0 = not sticky, 1 = sticky) when a GPIO pin is configured as an input. The GPIO pin status of an input configured as “sticky” is ‘cleared’ by writing a ‘0’ to the corresponding bit of the GPIO Pin Status Register (Index 54h), and by reset. 0000h Default After a Cold Reset or a modem Register Reset this register defaults to all 0’s, specifying “non-sticky”. “Sticky” is defined as edge sensitive, “non-sticky” as level sensitive. The upper 11 bits of this register always return ‘0’. DS549PP2 35 CS4202 4.21 D15 0 GPIO Pin Wakeup Mask Register (Index 52h) D14 0 D13 0 D12 0 D11 0 D10 0 D9 0 D8 0 D7 0 D6 0 D5 0 D4 GW4 D3 GW3 D2 GW2 D1 GW1 D0 GW0 GW[4:0] GPIO Pin Wakeup. This register provides a mask for determining if an input GPIO change will generate a wakeup event (0 = no, 1 = yes). When the AC-link is powered up, a wakeup event will be communicated through the assertion of GPIO_INT = 1 in input Slot 12. When the AC-link is powered down (Powerdown Control/Status Register (Index 26h) bit PR4 = 1 for primary codecs), a wakeup event will be communicated through a ‘0’ to ‘1’ transition on SDATA_IN. 0000h Default GPIO bits which have been programmed as inputs, “sticky”, and “wakeup”, upon transition either (high-to-low) or (low-to-high) depending on pin polarity, will cause an AC-link wakeup if and only if the AC-link was powered down. Once the controller has re-established communication with the CS4202 following a Warm Reset, it will continue to signal the wakeup event through the GPIO_INT bit of input Slot 12 until the AC ’97 controller clears the interrupt-causing bit in the GPIO Pin Status Register (Index 54h); or the “wakeup”, config, or “sticky” status of that GPIO pin changes. After a Cold Reset or a modem Register Reset (see Extended Modem ID Register (Index 3Ch)) this register defaults to all 0’s, specifying no wakeup event. The upper 11 bits of this register always return ‘0’. 4.22 D15 0 GPIO Pin Status Register (Index 54h) D14 0 D13 0 D12 0 D11 0 D10 0 D9 0 D8 0 D7 0 D6 0 D5 0 D4 GI4 D3 GI3 D2 GI2 D1 GI1 D0 GI0 GI[4:0] GPIO Pin Status. This register reflects the state of all GPIO pin inputs and outputs. These values are also reflected in Slot 12 of every SDATA_IN frame. GPIO inputs configured as “sticky” are ‘cleared’ by writing a ‘0’ to the corresponding bit of this register. The GPIO_INT bit in input Slot 12 is ‘cleared’ by clearing all interrupt-causing bits in this register. 0000h Default GPIO pins which have been programmed as inputs and “sticky”, upon transition either (high-to-low) or (low-to-high) depending on pin polarity, will cause the individual GI bit to be ‘set’, and remain ‘set’ until ‘cleared’. GPIO pins which have been programmed as outputs are controlled either through output Slot 12 or through this register, depending on the state of the GPOC bit in the Misc. Crystal Control Register (Index 60h). If the GPOC bit is ‘cleared’, the GI bits in this register are read-only and reflect the status of the corresponding GPIO output pin ‘set’ through output slot 12. If the GPOC bit is ‘set’, the GI bits in this register are read/write bits and control the corresponding GPIO output pins. The default value is always the state of the GPIO pin. The upper 11 bits of this register should be forced to zero in this register and input Slot 12. 4.23 D15 0 AC Mode Control Register (Index 5Eh) D14 0 D13 0 D12 0 D11 D10 ASPM 0 D9 TMM D8 DDM D7 0 D6 0 D5 D4 ASA1 ASA0 D3 0 D2 0 D1 0 D0 0 ASPM Analog S/PDIF Mode. The ASPM bit controls the input source to the S/PDIF transmitter block. When ‘clear’, the S/PDIF transmitter will receive data from the corresponding AC-link output slots. The actual slots are determined by the state of the SPSA[1:0] bits in the Extended Audio Status/Control Register (Index 2Ah). If ‘set’, the S/PDIF transmitter block will receive data DS549PP2 36 CS4202 from the ADC output. TMM True Mono Mode. The TMM bit controls the source of the stereo-to-mono mixer that feeds into the mono out select mux. If this bit is ‘clear’, the output of the stereo input mixer is sent to the stereo-to-mono mixer. If this bit is ‘set’, the output of the DAC direct mode mux is sent to the stereo-to-mono mixer. This allows a true mono mix that includes the PC Beep and Phone inputs and also works during DAC direct mode. DAC Direct Mode. The DDM bit controls the source of the line and headphone output drivers. When this bit is ‘clear’, the CS4202 stereo output mixer drives the line and headphone outputs. When this bit is ‘set’, the CS4202 audio DACs (DAC1 and DAC2) directly drive the line and headphone outputs. ADC Slot Assignment. The ASA[1:0] bits control the mapping of input slots to the ADC/SRC block. The default value of ‘00’ selects input slots 3 and 4. See Table 8 on page 30 for all available Slot Map settings. 0000h DDM ASA[1:0] Default DS549PP2 37 CS4202 4.24 D15 0 Misc. Crystal Control Register (Index 60h) D14 0 D13 0 D12 DPC D11 0 D10 0 D9 D8 Reserved D7 D6 10dB CRST D5 0 D4 0 D3 GPOC D2 D1 Reserved D0 LOSM DPC DAC Phase Control. This bit controls the phase of the PCM stream sent to the DACs (after SRC). When ‘cleared’ the phase of the signal will remain unchanged. When this bit is ‘set’, each PCM sample will be inverted before being sent to the DACs. Microphone 10 dB Boost. When ‘set’, the 10dB bit enables an additional boost of 10 dB on the selected microphone input. In combination with the 20dB boost bit in the Microphone Volume Register (Index 0Eh) this bit allows for variable boost from 0 dB to +30 dB in steps of 10 dB. Force Cold Reset. The CRST bit is used as an override to the New Warm Reset behavior defined during PR4 powerdown. If this bit is ‘set’, an active RESET# signal will force a Cold Reset to the CS4202 during a PR4 powerdown. General Purpose Output Control. The GPOC bit specifies the mechanism by which the status of a General Purpose Output pin can be controlled. If this bit is ‘cleared’, the GPO status is controlled through the standard AC ’97 method of setting the appropriate bits in output Slot 12. If this bit is ‘set’, the GPO status is controlled through the GPIO Pin Status Register (Index 54h). Loss of SYNC Mute Enable. The LOSM bit controls the loss of SYNC mute function. If this bit is ‘set’, the CS4202 will mute all analog outputs for the duration of loss of SYNC. If this bit is ‘cleared’, the mixer will continue to function normally during loss of SYNC. The CS4202 expects to sample SYNC ‘high’ for 16 consecutive BIT_CLK periods and then ‘low’ for 240 consecutive BIT_CLK periods, otherwise loss of SYNC becomes true. 0003h 10dB CRST GPOC LOSM Default 38 DS549PP2 CS4202 4.25 D15 SDEN Serial Port Control Register (Index 6Ah) D14 0 D13 0 D12 0 D11 0 D10 0 D9 0 D8 0 D7 0 D6 0 D5 0 D4 0 D3 D2 D1 D0 SDO2 SDSC SDF1 SDF0 SDEN Serial Data Output Enable. The SDEN bit enables transmission of serial data on the SDOUT pin. The SDEN bit routes the left and right channel data from the AC ’97 controller to the serial data port. The actual data routed to the serial data port are controlled through the DSA[1:0] configuration in the Extended Audio ID Register (Index 28h). SDEN also functions as a master control for the second serial data output port and the serial clock. Setting this bit also disables the GPIO[1:0] pins and clears the GC[1:0] bits in the GPIO Pin Configuration Register (Index 4Ch). Clearing this bit re-enables the GPIO[1:0] pins and sets the GC[1:0] bits. Serial Data Output 2 Enable. The SDO2 bit enables transmission of serial data on the GPIO4/SDO2 pin. The SDO2 bit routes the left and right channel data from the AC ’97 controller to the second serial data port. The actual slots routed to the second serial data port are controlled through the DSA[1:0] configuration in the Extended Audio ID Register (Index 28h). This bit can only be ‘set’ if the SDEN bit is ‘1’ and will be ‘cleared’ automatically if SDEN returns to ‘0’. Setting this bit also disables the GPIO4 pin and clears the GC4 bit in the GPIO Pin Configuration Register (Index 4Ch). Clearing this bit re-enables the GPIO4 pin and sets the GC4 bit. Serial Clock Enable. The SDSC bit enables transmission of a serial clock on the EAPD/SCLK pin. Serial data can be routed to DACs that support internal SCLK mode without transmitting a serial clock. For DACs that only support external SCLK mode, transmission of a serial clock is required and this bit must be set to ‘1’. This bit can only be set if the SDEN bit is ‘1’ and will be cleared automatically if SDEN returns to ‘0’. Furthermore, the SDSC bit can only be ‘set’ if the EAPD bit in the Powerdown Control/Status Register (Index 26h) is ‘0’. If the SDEN bit is ‘0’ or the EAPD bit is ‘1’, SDSC is a read-only bit and always returns ‘0’. Serial Data Format. The SDF[1:0] bits control the format of the serial data transmitted on the two output ports. All ports will use the same format. See Table 12 for available formats. 0000h SDF1 SDF0 0 0 1 1 0 1 0 1 Serial Data Format I2S Left Justified Right Justified, 20-bit data Right Justified, 16-bit data SDO2 SDSC SDF[1:0] Default Table 12. Serial Data Format Selection DS549PP2 39 CS4202 4.26 D15 E15 BIOS-Driver Interface Control Registers (Index 70h - 72h) D14 E14 D13 E13 D12 E12 D11 E11 D10 E10 D9 E9 D8 E8 D7 E7 D6 E6 D5 E5 D4 E4 D3 E3 D2 E2 D1 E1 D0 E0 E[15:0] Default Event Configuration. The E[15:0] bits control the BIOS-Driver Interface mechanism. 0000h The BDI Config Register (Index 70h) enables BIOS-Driver communication for each possible event. If a bit is ‘0’, the corresponding event will not be communicated. If a bit is ‘1’, the corresponding event will be communicated by asserting the BDI bit in input slot 12. If an event occurs, the BIOS will ‘set’ the corresponding bit in the BDI Status Register (Index 7Ah). This bit remains ‘set’ until it is cleared by the driver, acknowledging the event has been handled. This behavior is equivalent to “non-sticky” (level sensitive) GPIO input pins. The BDI Wakeup Register (Index 72h) provides a mask for determining if a BDI event will generate a wakeup or GPIO_INT. If a bit is ‘0’, the corresponding event will not generate an interrupt. If a bit is ‘1’, the corresponding event will generate an interrupt. Refer to the GPIO Pin Wakeup Mask Register (Index 52h) for details about wakeup interrupts. 4.27 D15 E15 BIOS-Driver Interface Status Register (Index 7Ah) D14 E14 D13 E13 D12 E12 D11 E11 D10 E10 D9 E9 D8 E8 D7 E7 D6 E6 D5 E5 D4 E4 D3 E3 D2 E2 D1 E1 D0 E0 E[15:0] Default Event Status. This register, in conjunction with the BIOS-Driver Interface Control Registers (Index 70h - 72h), controls the BIOS-Driver Interface mechanism. 0000h The BDI Status Register (Index 7Ah) reflects the state of all possible events. If a bit is ‘0’, the corresponding event has not occurred or has already been handled by the driver. If a bit is ‘1’, the corresponding event has occurred and has not been handled by the driver yet. The BDI bit in input slot 12 is a logic OR of all bits in this register ANDed with their corresponding bit in the BDI Config Register (Index 70h). After handling an event, the driver should clear it by writing a ‘0’ to the corresponding bit of this register. 40 DS549PP2 CS4202 4.28 D15 F7 Vendor ID1 Register (Index 7Ch) D14 F6 D13 F5 D12 F4 D11 F3 D10 F2 D9 F1 D8 F0 D7 S7 D6 S6 D5 S5 D4 S4 D3 S3 D2 S2 D1 S1 D0 S0 F[7:0] S[7:0] Default First Character of Vendor ID. With a value of F[7:0] = 43h, these bits define the ASCII ‘C’ character. Second Character of Vendor ID. With a value of S[7:0] = 52h, these bits define the ASCII ‘R’ character. 4352h. This register contains read-only data. 4.29 D15 T7 Vendor ID2 Register (Index 7Eh) D14 T6 D13 T5 D12 T4 D11 T3 D10 T2 D9 T1 D8 T0 D7 0 D6 DID2 D5 DID1 D4 DID0 D3 0 D2 D1 D0 REV2 REV1 REV0 T[7:0] DID[2:0] REV[2:0] Default Third Character of Vendor ID. With a value of T[7:0] = 59h, these bits define the ASCII ‘Y’ character. Device ID. With a value of DID[2:0] = 111, these bits specify the audio codec is a CS4202. Revision. With a value of REV[2:0] = 001, these bits specify the audio codec revision is ‘A’. 597xh. This register contains read-only data. The two Vendor ID registers provide a means to determine the manufacturer of the AC ’97 audio codec. The first three bytes of the Vendor ID registers contain the ASCII code for the first three letters of Crystal (CRY). The final byte of the Vendor ID registers is divided into a Device ID field and a Revision field. Table 13 lists the currently defined Device ID’s. DID2 - DID0 000 001 010 011 100 101 110 111 Part Name CS4297 CS4297A CS4294/CS4298 CS4299 CS4201 CS4205 CS4291 CS4202 Table 13. Device ID with Corresponding Part Number DS549PP2 41 CS4202 5. SERIAL DATA PORTS 5.1 Overview the DPC bit in the Misc. Crystal Control Register (Index 60h). This feature is necessary since the phase response for external DACs is unknown and the phase response of the internal DACs can vary depending on the path determined by the DDM bit in the AC Mode Control Register (Index 5Eh) and the output (LINE_OUT or HP_OUT) being used. This feature guarantees that all DACs in a system have the same phase response, maintaining the accuracy of spatial cues. Please note the data sent to the serial ports is straight from the AC-link. There is no SRC and no volume control available on this data, so it is the responsibility of the controller or host software to provide this functionality if desired. The CS4202 implements two serial data output ports that can be used for multi-channel expansion. Each serial port consists of 4 signals: MCLK, SCLK, LRCLK, and SDATA. The existing 256 Fs BIT_CLK will be used as MCLK. The clock pins are shared between all the serial ports with only the SDATA pins being separate; SDOUT for the first output port, and SDO2 for the second output port. Serial data is transmitted on these ports every AC-link frame. The serial data port is controlled by the SDEN, SDSC, and SDO2 bits in the Serial Port Control Register (Index 6Ah). All the serial data port pins are multiplexed with other functions and cannot be used unless the other function is disabled or powered down; see Section 7, Exclusive Functions. Some audio DACs can run in an internal SCLK mode where SCLK is internally derived from MCLK and LRCLK. In this case, SCLK generation in the CS4202 is optional. A feature has been designed into the CS4202 that allows the phase of the internal DACs to be reversed. This DAC phase reversal is controlled by LINE_OUT_L LINE_OUT_R 35 36 5.2 Multi-Channel Expansion For multi-channel expansion, the two serial data output ports are used to send AC-link data to one or two external stereo DACs to support up to a total of six channels. The first serial port takes the digital audio data from the SDOUT slots. The second serial port takes the digital audio data from the SDO2 slots. See Table 8 on page 30 for the actual slots used depending on configuration. Figure 10 shows a six channel application using the CS4202. + + 10uF ELEC 10uF ELEC 220K 220K Left Front Right Front 1000pF 1000pF AGND GPIO1/SDOUT EAPD/SCLK GPIO0/LRCLK BIT_CLK GPIO4/SDO2 44 47 43 6 34 CS4334 1 8 SDATA AOUTL 2 DEM#/SCLK 3 LRCK 4 5 MCLK AOUTR 270K + + 270K 10uF ELEC 10uF ELEC 47K 560 560 Right Surround 47K AGND Left Surround 2700pF 2700pF AGND Center LFE CS4334 8 1 SDATA AOUTL 2 DEM#/SCLK 3 LRCK 4 5 MCLK AOUTR AGND + + 270K 270K 10uF ELEC 10uF ELEC AGND 560 560 47K 47K 2700pF 2700pF AGND AGND AGND Figure 10. Serial Data Port: Six Channel Circuit 42 DS549PP2 CS4202 5.3 Serial Data Formats be 64 Fs (BIT_CLK/4). Serial data is transitioned by the CS4202 on the falling edge of SCLK and latched by the DACs on the next rising edge. Serial data is shifted out MSB first in all supported formats, but LRCLK polarity as well as data justification, alignment, and resolution vary. Table 14 shows the principal characteristics of each serial format. In order to support a wide variety of serial audio DACs, the CS4202 can transmit serial data in four different formats. The desired format is selected through the SDF[1:0] bits in the Serial Port Control Register (Index 6Ah). All serial ports use the same serial data format when enabled. In all cases, LRCLK will be synchronous with Fs, and SCLK will SDF[1:0] 00 01 10 11 LRCLK Data Data Alignment Data Timing Polarity Justification (MSB vs. LRCLK) Resolution Diagram negative positive positive positive left justified left justified right justified right justified 1 SCLK delayed not delayed not delayed not delayed 20-bit 20-bit 20-bit 16-bit Figure 11 Figure 12 Figure 13 Figure 14 Recommended DAC CS4334 CS4335 CS4337 CS4338 Table 14. Serial Data Formats and Compatible DACs for the CS4202 LRCK SCLK Left Channel Right Channel SDATA M B-1 -2 -3 -4 -5 S +5 +4 +3 +2 +1 LSB M B-1 -2 -3 -4 S +5 +4 +3 +2 +1 LSB Figure 11. Serial Data Format 0 (I2S) LRCK SCLK Left Channel Right Channel SDATA M B-1 -2 -3 -4 -5 S +5 +4 +3 +2 +1 LSB M SB-1 -2 -3 -4 +5 +4 +3 +2 +1 LSB Figure 12. Serial Data Format 1 (Left Justified) LRCK Left Channel Right Channel SCLK SDATA 10 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 Figure 13. Serial Data Format 2 (Right Justified, 20-bit data) LRCK Left Channel Right Channel SCLK SDATA 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 Figure 14. Serial Data Format 3 (Right Justified, 16-bit data) DS549PP2 43 CS4202 6. SONY/PHILIPS DIGITAL INTERFACE (S/PDIF) The S/PDIF digital output is used to interface the CS4202 to consumer audio equipment external to the PC. This output provides an interface for storing digital audio data or playing digital audio data to digital speakers. Figure 15 illustrates the circuits necessary for implementing the IEC-958 optical or consumer interface. For further information on S/PDIF operation see application note AN22: Overview of Digital Audio Interface Data Structures [3]. For further information on S/PDIF recommended transformers see application note AN134: AES and S/PDIF Recommended Transformers [4]. • with SDOUT pin, and GPIO4 pin is shared with SDO2 pin) EAPD and Serial Data Port Serial Clock (EAPD pin is shared with SCLK pin) 7. EXCLUSIVE FUNCTIONS Some of the digital pins on the CS4202 have multiplexed functionality. These functions are mutually exclusive and cannot be requested at the same time. The following pairs of functions are mutually exclusive: • GPIO and Serial Data Port (GPIO0 pin is shared with LRCLK pin, GPIO1 pin is shared Use of the GPIO0/LRCLK, GPIO1/SDOUT, and GPIO4/SDO2 pins for serial data port has priority over their GPIO functionality. There is no priority assigned to the other exclusive function. A function currently in use must be disabled or powered down before the corresponding exclusive function can be enabled. The following control bits for these functions will behave differently than normal bits: the EAPD bit in the Powerdown Control/Status Register (Index 26h), the GC[4,1:0] bits in the GPIO Pin Configuration Register (Index 4Ch), and the SDO2, and SDSC bits in the Serial Port Control Register (Index 6Ah). These bits can become read-only bits if they control a feature that is currently unavailable because the corresponding exclusive feature is already in use, or the corresponding master control for this feature is not set. R1 SPDIF_OUT R2 T1 J1 +5V_PCI 0.1 µ F 5 SPDIF_OUT 4 3 8.2 k Ω 2 1 6 DGND DVdd 3.3V 5V R1 247.5 Ω 375 Ω R2 107.6 Ω 93.75 Ω DGND DGND TOTX-173 DGND Figure 15. S/PDIF Output 44 DS549PP2 CS4202 8. POWER MANAGEMENT 8.1 AC ’97 Reset Modes The CS4202 supports four reset methods, as defined in the AC ’97 Specification: Cold Reset, Warm Reset, New Warm Reset, and Register Reset. A Cold Reset results in all AC ’97 logic (registers included) initialized to its default state. A Warm Reset or New Warm Reset leaves the contents of the AC ’97 register set unaltered. A Register Reset initializes only the AC ’97 registers to their default states. mal BIT_CLK clock periods (162.8 ns) after the SYNC signal is de-asserted. A Warm Reset of the secondary codec is recognized when the primary codec on the AC-link resumes BIT_CLK generation. The CS4202 will wait for BIT_CLK to be stable to restore SDATA_IN activity, S/PDIF and/or serial data port transmission on the following frame. 8.1.3 New Warm Reset 8.1.1 Cold Reset A Cold Reset is achieved by asserting RESET# for a minimum of 1 µs after the power supply rails have stabilized. This is done in accordance with the minimum timing specifications in the AC ’97 Serial Port Timing section on page 9. Once de-asserted, all of the CS4202 registers will be reset to their default power-on states and the BIT_CLK and SDATA_IN signals will be reactivated. The New Warm Reset also allows the AC-link to be reactivated without losing information in the registers. A New Warm Reset is required to resume from a D3cold state where AC-link power has been removed. New Warm Reset is recognized by the low-high transition of RESET# after the AC-link has been programmed into PR4 powerdown. The New Warm Reset functionality can be disabled by setting the CRST bit in the Misc. Crystal Control Register (Index 60h). 8.1.4 Register Reset 8.1.2 Warm Reset A Warm Reset allows the AC-link to be reactivated without losing information in the CS4202 registers. A Warm Reset is required to resume from a D3hot state where the AC-link had been halted yet full power had been maintained. A primary codec Warm Reset is initiated when the SYNC signal is driven high for at least 1 µs and then driven low in the absence of the BIT_CLK clock signal. The BIT_CLK clock will not restart until at least 2 nor- The last reset mode provides a Register Reset to the CS4202. This is available only when the CS4202 AC-link is active and the Codec Ready bit is ‘set’. The audio (including extended audio) control registers (Index 00h - 3Ah) and the vendor specific registers (Index 5Ah - 7Ah) are reset to their default states by a write of any value to the Reset Register (Index 00h). The modem (including GPIO) registers (Index 3Ch - 56h) are reset to their default states by a write of any value to the Extended Modem ID Register (Index 3Ch). DS549PP2 45 CS4202 8.2 Powerdown Controls systems continue to function. The required resume sequence from a PR4 state is either a Warm Reset or a New Warm Reset, depending on whether a D3hot or D3cold state has been entered. The PR5 bit disables all internal clocks and powers down the DACs and the ADCs, but maintains operation of the BIT_CLK and the analog mixer. A Cold Reset is the only way to restore operation to the CS4202 after asserting PR5. To achieve a complete digital powerdown, PR4 and PR5 must be asserted within a single AC output frame. This will also drive BIT_CLK ‘low’. The CS4202 does not automatically mute any input or output when the powerdown bits are ‘set’. The software driver controlling the AC ’97 device must manage muting the input and output analog signals before putting the part into any power management state. The definition of each PRx bit may affect a single subsection or a combination of subsections within the CS4202. Table 16 contains the matrix of subsections affected by the respective PRx function. Table 17 shows the different operating power consumptions levels for different powerdown functions. The Powerdown Control/Status Register (Index 26h) controls the power management functions. The PR[6:0] bits in this register control the internal powerdown states of the CS4202. Powerdown control is available for individual subsections of the CS4202 by asserting any PRx bit or any combination of PRx bits. All powerdown states except PR4 and PR5 can be resumed by clearing the corresponding PRx bit. Table 15 shows the mapping of the power control bits to the functions they manage. When PR0 is ‘set’, the L/R ADCs and the Input Mux are shut down and the ADC bit in the Powerdown Control/Status Register (Index 26h) is ‘cleared’ indicating the ADCs are no longer in a ready state. The same is true for PR1 and the DACs, PR2 and the analog mixer, PR3 and the voltage reference (Vrefout), and PR6 and the headphone amplifier. When one of these bits is ‘cleared’, the corresponding subsystem will begin a power-on process, and the associated status bit will be ‘set’ when the hardware is ready. In a primary codec the PR4 bit powers down the AC-link, but all other analog and digital sub- PR Bit PR0 PR1 PR2 PR3 PR4 PR5 PR6 Function L/R ADCs and Input Mux Powerdown Front DACs Powerdown Analog Mixer Powerdown (Vref on) Analog Mixer Powerdown (Vref off) AC-link Powerdown (BIT_CLK off)* Internal Clock Disable Headphone Out Powerdown * Applies only to primary codec Table 15. Powerdown PR Bit Functions 46 DS549PP2 CS4202 PR Bit PR0 PR1 PR2 PR3 PR4 PR5 PR6 Table 16. Powerdown PR Function Matrix for the CS4202 Power State Full Power + SRC’s Full Power + S/PDIF Full Power + HP Full Power ADCs off (PR0) DACs off (PR1) Audio off (PR2) Vref off (PR3) AC-Link off (PR4) Internal Clocks off (PR5) HP amp off (PR6) Digital off (PR4+PR5) All off (PR3+PR4+PR5) RESET 1 ADCs DACs Mixer Analog Reference AC Link Internal Clock Off Headphone • • • • • • • • • • • • • • • • IDVdd (mA) [DVdd=3.3 V] 25.2 1 IDVdd (mA) [DVdd=5 V] 40.2 46.6 41.5 41.5 37.9 38.4 34.9 34.9 35.3 6.3 41.5 21 µA 21 µA 1.4 IAVdd1 (mA) 31.3 31.3 32.1 31.3 23.2 25.8 3.8 1.5 31.2 19.0 29.8 19.0 1.3 3.6 IAVdd2 (mA) 5.1 5.1 39.5 5.1 4.9 5.0 0 µA 0 µA 5.1 4.6 0 µA 4.6 0 µA 0 µA 30.0 26.4 26.4 24.0 24.3 21.9 21.9 21.8 3.8 26.3 10 µA 10 µA 0.8 2 Table 17. Power Consumption by Powerdown Mode for the CS4202 Assuming standard resistive load for transformer coupled coaxial S/PDIF output (Rload = 292 Ohm, DVdd = 3.3 V) (Rload = 415 Ohm, DVdd = 5 V). General: IDVdd S/PDIF = IDVdd + DVdd/Rload/2 2 HP_OUT_L, HP_OUT_R driving 4 Vpp into 32 Ohm resistive load. DS549PP2 47 CS4202 9. CLOCKING The CS4202 may be operated as a primary or secondary codec. As a primary codec, the system clock for the AC-link may be generated from an external 24.576 MHz clock source, a 24.576 MHz crystal, or the internal Phase Locked Loop (PLL). The PLL allows the CS4202 to accept external clock frequencies other than 24.576 MHz. As a secondary codec, the system clock is derived from BIT_CLK, which is generated by the primary codec. The CS4202 uses the presence or absence of a valid clock on the XTL_IN pin in conjunction with the state of the ID[1:0]# pins to determine the clocking configuration. See Table 18 for all available CS4202 clocking modes. 9.2 24.576 MHz Crystal Operation If a valid clock is not present on XTL_IN during the rising edge of RESET#, the device disables the PLL input and latches the state of the ID[1:0]# inputs. If the ID[1:0]# inputs are both pulled high or left floating, the device is configured as a primary codec. An external 24.576 MHz crystal is used as the system clock as shown in Figure 17. 9.3 Secondary Codec Operation 9.1 PLL Operation (External Clock) The PLL mode is activated if a valid clock is present on XTL_IN before the rising edge of RESET#. Once PLL mode is entered, the XTL_OUT pin is redefined as the PLL loop filter, as shown in Figure 16. The ID[1:0]# inputs determine the configuration of the internal divider ratios required to generate the 12.288 MHz BIT_CLK output; see Table 18 on page 49 for additional details. In PLL mode, the CS4202 is configured as a primary codec independent of the state of the ID[1:0]# pins. If 24.576 MHz is chosen as the external clock input (ID[1:0]# inputs both pulled high or left floating), the PLL is disabled and the clock is used directly. The loop filter is not required and XTL_OUT is left unconnected. For all other clock input choices, the loop filter is required. The ID[1:0] bits of the Extended Audio ID Register (Index 28h) and the Extended Modem ID Register (Index 3Ch) will always report ‘00’ in PLL mode. If a valid clock is not present on XTL_IN and either ID[1:0]# input is pulled low during the rising edge of RESET#, the device is determined to be a secondary codec. The BIT_CLK pin is configured as an input and the CS4202 is driven from the 12.288 MHz BIT_CLK of the primary codec. The ID[1:0] bits of the Extended Audio ID Register (Index 28h) and the Extended Modem ID Register (Index 3Ch) will report the state of the ID[1:0]# inputs. Clock Source XTL_IN XTL_OUT 2.2 k Ω 0.022 uF 220 pF DGND Figure 16. PLL External Loop Filter 48 DS549PP2 CS4202 XTL_IN XTL_OUT 24.576 MHz 22 pF 22 pF DGND Figure 17. External Crystal External Clock on ID1# ID0# XTL_IN Yes Yes Yes Yes No No No No 1 1 0 0 1 1 0 0 1 0 1 0 1 0 1 0 AC-Link Timing Mode Primary Primary Primary Primary Primary Secondary Secondary Secondary Codec ID 0 0 0 0 0 1 2 3 Clock Source Clock Rate (MHz) PLL Active No Yes Yes Yes No No No No Application Notes clock generator driving XTL_IN external clock source driving XTL_IN loop filter connected to XTL_OUT crystal connected to XTL_IN, XTL_OUT BIT_CLK from primary codec driving BIT_CLK on all secondary codecs External 24.576 External 14.31818 External 27.000 External 48.000 XTAL 24.576 BIT_CLK 12.288 BIT_CLK 12.288 BIT_CLK 12.288 Table 18. Clocking Configurations for the CS4202 DS549PP2 49 CS4202 10. ANALOG HARDWARE DESCRIPTION The analog input section consists of four stereo line-level inputs (LINE_L/R, CD_L/C/R, VIDEO_L/R, and AUX_L/R), two selectable mono microphone inputs (MIC1 and MIC2), and two mono inputs (PC_BEEP and PHONE). The analog output section consists of a mono output (MONO_OUT), a stereo headphone output (HP_OUT_L/R), and a stereo line-level output (LINE_OUT_L/R). This section describes the analog hardware needed to interface with these pins. The designs presented in this section are compliant with Chapter 17 of Microsoft’s® PC 99 System Design Guide [7] (referred to as PC 99) and Chapter 11 of Microsoft’s® PC 2001 System Design Guide [8] (referred to as PC 2001). For information on EMI reduction techniques refer to the application note AN165: CS4297A/CS4299 EMI Reduction Techniques [5]. CD_L and CD_R. This pin takes the common-mode noise out of the CD inputs when connected to the CD analog source ground. Following the reference design in Figure 19 provides extra attenuation of common mode noise coming from the CD-ROM drive, thereby producing a higher quality signal. One percent resistors are recommended since closely matched resistor values provide better common-mode attenuation of unwanted signals. The circuit shown in Figure 19 can be used for a 1 VRMS CD input signal. 6.8 kΩ 6.8 kΩ 1.0 µ F 1.0 µ F LINE_IN_R LINE_IN_L AGND 6.8 kΩ 6.8 kΩ AGND Figure 18. Line Input (Replicate for Video and AUX) 10.1 Analog Inputs CD_R CD_L CD_COM 100 Ω 100 Ω 100 Ω 47 kΩ 47 kΩ 1.0 µ F 1.0 µ F 2.2 µ F CD_R CD_L CD_C All analog inputs to the CS4202, including CD_C, should be capacitively coupled to the input pins. Unused analog inputs should be tied together and connected through a capacitor to analog ground or tied to the Vrefout pin directly. The maximum allowed voltage for analog inputs, except the microphone input, is 1 VRMS. The maximum allowed voltage for the microphone input depends on the selected boost setting. 47 kΩ AGND Figure 19. Differential 1 VRMS CD Input 10.1.3 Microphone Inputs Figure 20 illustrates an input circuit suitable for dynamic and electret microphones. Electret, also known as phantom-powered, microphones use the right channel (ring) of the jack for power. The design also supports the recommended advanced frequency response for voice recognition as specified in PC 99 and PC 2001. The microphone input of the CS4202 has an integrated pre-amplifier. Using combinations of the 10dB bit in the Misc. Crystal Control Register (Index 60) and the 20dB bit in the DS549PP2 10.1.1 Line Inputs Figure 18 shows circuitry for a line-level stereo input. Replicate this circuit for the Video and Aux inputs. This design attenuates the input by 6 dB, bringing the signal from the PC 99 specified 2 VRMS, to the CS4202 maximum allowed 1 VRMS. 10.1.2 CD Input The CD line-level input has an extra pin, CD_C, providing a pseudo-differential input for both 50 CS4202 Mic Volume Register (Index 0Eh) the pre-amplifier gain can be set to 0 dB, 10 dB, 20 dB, or 30 dB. 10.1.5 Phone Input One application of the PHONE input is to interface to the output of a modem analog front end (AFE) device so that modem dialing signals and protocol negotiations may be monitored through the audio system. Figure 22 shows a design for a modem connection where the output is fed from the CS4202 MONO_OUT pin through a divider. The divider ratio shown does not attenuate the signal, providing an output voltage of 1 VRMS. If a lower output voltage is desired, the resistors can be replaced with appropriate values, as long as the total load on the output is kept greater than 10 kΩ. The PHONE input is divided by 6 dB to accommodate a line-level source of 2 VRMS. 10.1.4 PC Beep Input The PC_BEEP input is useful for mixing the output of the “beeper” (timer chip), provided in most PCs, with the other audio signals. When the CS4202 is held in reset, PC_BEEP is passed directly to the line output. This allows the system sounds or “beeps” to be available before the AC ’97 interface has been activated. Figure 21 illustrates a typical input circuit for the PC_BEEP input. If PC_BEEP is driven from a CMOS gate, the 4.7 kΩ resistor should be tied to analog ground instead of +5VA. Although this input is described for a low-quality “beeper”, it is of the same high-quality as all other analog inputs and may be used for other purposes. 10.2 Analog Outputs +5VA 1.5 kΩ + 2.2 kΩ 10 µ F ELEC AGND 0.1 µ F X7R 100 Ω MIC1/MIC2 0.1 µ F X7R AGND AGND The analog output section provides a stereo, a headphone, and a mono output. The MONO_OUT, LINE_OUT_L, and LINE_OUT_R pins require 680 pF to 1000 pF NPO dielectric capacitors between the corresponding pin and analog ground. Each analog output is DC-biased up to the Vrefout voltage signal reference, nominally 2.4 V. This requires the outputs be AC-coupled to external circuitry (AC loads must be greater than 10 kΩ for the line output or 32 Ω for the headphone output). The headphone coupling capacitors should be 220 µF or greater to minimize low frequency roll-off. Figure 20. Microphone Input 10.2.1 Stereo Outputs The LINE_OUT and HP_OUT stereo outputs depend on the configuration of the HPCFG pin. As shown in Figure 23, if the HPCFG pin is left floating, PHONE 6.8 kΩ 0Ω 47 k Ω 1.0 µ F 1.0 µ F PHONE MONO_OUT 6.8 k Ω 1000 pF AGND +5VA (Low Noise) or AGND if CMOS Source 4.7 k Ω 47 k Ω PC-BEEP-BUS 2.7 nF X7R PC_BEEP 0.1 µ F X7R MONO_OUT AGND Figure 21. PC_BEEP Input AGND Figure 22. Modem Connection DS549PP2 51 CS4202 the part behaves as specified in AC ’97. As shown in Figure 24, if the HPCFG pin is grounded, the part behaves as if HP_OUT was the only output. In this case, LINE_OUT will be muted, the Master Volume Register (Index 02h) will control HP_OUT and PC_BEEP will be routed to HP_OUT during RESET. 10.2.2 Mono Output The mono output, MONO_OUT, can be either a sum of the left and right output channels, attenuated by 6 dB to prevent clipping at full scale, or the selected Mic signal. The mono out channel can drive the PC internal mono speaker using an appropriate buffer circuit. 10.3 Miscellaneous Analog Signals LINE_OUT_R LINE_OUT_L + 10 µ F ELEC 10 µ F ELEC 220 k Ω Line Out Jack The AFLT1 and AFLT2 pins must have a 1000 pF NPO capacitor to analog ground. These capacitors provide a single-pole low-pass filter at the inputs to the ADCs. This makes low-pass filters at each analog input pin unnecessary. The REFFLT pin must have a short, wide trace to a 2.2 µF and a 0.1 µF capacitor connected to analog ground (see Figure 26 in Section 11, Grounding and Layout, for an example). The 2.2 µF capacitor must not be replaced by any other value (it may be replaced with two 1 µF capacitors in parallel) and must be ceramic with low leakage current. Electrolytic capacitors should not be used. No other connection should be made, as any coupling onto this pin will degrade the analog performance of the CS4202. Likewise, digital signals should be kept away from REFFLT for similar reasons. + 220 k Ω 1000 pF 1000 pF AGND HP_OUT_R HP_OUT_L HP_OUT_C HPCFG + 220 µ F ELEC 220 µ F ELEC 1 µF ELEC 10 k Ω AGND AGND Headphone Jack + + 10 k Ω AGND AGND Figure 23. Line Out and Headphone Out Setup 10.4 Power Supplies LINE_OUT_R LINE_OUT_L HP_OUT_R HP_OUT_L HP_OUT_C HPCFG AGND AGND AGND + 220 µ F ELEC 220 µ F ELEC 1 µF ELEC 10 k Ω 10 k Ω Line Out/ Headphone Jack + + Figure 24. Line Out/Headphone Out Setup The power supplies providing analog power should be as clean as possible to minimize coupling into the analog section which could degrade analog performance. The +5 V analog supply should be generated from a voltage regulator (7805 type) connected to a +12 V supply. This helps isolate the analog circuitry from noise typically found on +5 V digital supplies. A typical voltage regulator circuit for analog power using an MC78M05CDT is shown in Figure 25. One analog power pin, AVdd2, supplies power to the headphone amplifier on the CS4202. The other analog power pin, AVdd1, supplies power to the rest of the CS4202 analog circuitry. The digital power pins, DVdd1 and DVdd2, should be connected to the same DS549PP2 52 CS4202 digital supply as the controller’s AC-link interface. Since the digital interface on the CS4202 may operate at either +3.3 V or +5 V, proper connection of these pins will depend on the digital power supply of the controller. +12VD MC78M05CDT 1 + +5VA IN GND OUT 3 + 10.5 Reference Design 0.1 µF Y5V 10 µF ELEC 2 0.1 µF Y5V 10 µF ELEC See Section 14 for a CS4202 reference design. DGND AGND Figure 25. +5V Analog Voltage Regulator DS549PP2 53 CS4202 11. GROUNDING AND LAYOUT Figure 26 on page 55 shows the conceptual layout for the CS4202 in XTAL or OSC clocking modes. The decoupling capacitors should be located physically as close to the pins as possible. Also, note the connection of the REFFLT decoupling capacitors to the ground return trace connected directly to the ground return pin, AVss1. It is strongly recommended that separate analog and digital ground planes be used. Separate ground planes keep digital noise and return currents from modulating the CS4202 ground potential and degrading performance. The digital ground pins should be connected to the digital ground plane and kept separate from the analog ground connections of the CS4202 and any other external analog circuitry. All analog components and traces should be located over the analog ground plane and all digital components and traces should be located over the digital ground plane. The common connection point between the two ground planes (required to maintain a common ground voltage potential) should be located under the CS4202. The AC-link digital interface connection traces should be routed such that the digital ground plane lies underneath these signals (on the internal ground layer). This applies along the entire length of these traces from the AC ’97 controller to the CS4202. Refer to the Application Note AN18: Layout and Design Rules for Data Converters and Other Mixed Signal Devices [2] for more information on layout and design rules. 54 DS549PP2 CS4202 1000 pF NPO Vrefout toVia Via to +5VA 2.2 µF 0.1 µF Y5V Via to +5VA AFLT1 AVss1 REFFLT AVdd1 AFLT2 0.1 µF Y5V AVdd2 Via to Analog Ground Via to Analog Ground Analog Ground AVss2 Digital Ground Via to Digital Ground Pin 1 0.1 µF Y5V DVss1 DVdd1 DVss2 0.1 µF Y5V DVdd2 Via to +5VD or +3.3VD Via to +5VD or +3.3VD Figure 26. Conceptual Layout for the CS4202 when in XTAL or OSC Clocking Modes DS549PP2 55 CS4202 12. PIN DESCRIPTIONS LINE_OUT_R GPIO4/SDO2 LINE_OUT_L REFFLT HPCFG Vrefout GPIO3 GPIO2 AFLT2 AFLT1 36 MONO_OUT AVdd2 HP_OUT_L HP_OUT_C HP_OUT_R AVss2 GPIO0/LRCLK GPIO1/SDOUT ID0# ID1# EAPD/SCLK SPDIF_OUT 37 38 39 40 41 42 43 44 45 46 47 48 1 DVdd1 35 34 33 32 31 30 29 28 27 26 25 24 23 22 21 20 LINE_IN_R LINE_IN_L MIC2 MIC1 CD_R CD_C CD_L VIDEO_R VIDEO_L AUX_R AUX_L PHONE CS4202 48-pin Package Layout AVdd1 19 18 17 16 15 14 13 12 PC_BEEP 2 XTL_IN 3 XTL_OUT 4 DVss1 5 SDATA_OUT 6 BIT_CLK 7 DVss2 8 SDATA_IN 9 DVdd2 10 SYNC 11 RESET# Figure 27. Pin Locations for the CS4202 56 AVss1 DS549PP2 CS4202 Audio I/O Pins PC_BEEP - Analog Mono Source, Input, Pin 12 The PC_BEEP input is intended to allow the PC system POST (Power On Self-Test) tones to pass through to the audio subsystem. The PC_BEEP input has two connections: the first connection is to the analog output mixer, the second connection is directly to the LINE_OUT stereo outputs (if HPCFG is floating) or through the headphone amplifier to the HP_OUT pins (if HPCFG is tied low). While the RESET# pin is actively being asserted to the CS4202, the PC_BEEP bypass path to the LINE_OUT or HP_OUT outputs is enabled. While the CS4202 is in normal operation mode with RESET# de-asserted, PC_BEEP is a monophonic source to the analog output mixer. The maximum allowable input is 1 VRMS (sinusoidal). This input is internally biased at the Vrefout voltage reference and requires AC-coupling to external circuitry. If this input is not used, it should be connected to the Vrefout pin or AC-coupled to analog ground. PHONE - Analog Mono Source, Input, Pin 13 This analog input is a monophonic source to the output mixer. It is intended to be used as a modem subsystem input to the audio subsystem. The maximum allowable input is 1 VRMS (sinusoidal). This input is internally biased at the Vrefout voltage reference and requires AC-coupling to external circuitry. If this input is not used, it should be connected to the Vrefout pin or AC-coupled to analog ground. MIC1 - Analog Mono Source, Input, Pin 21 This analog input is a monophonic source to the analog output mixer. It is intended to be used as a desktop microphone connection to the audio subsystem. The CS4202 internal mixer's microphone input is MUX selectable with either MIC1 or MIC2 as the input.The maximum allowable input is 1 VRMS (sinusoidal). This input is internally biased at the Vrefout voltage reference and requires AC-coupling to external circuitry. If this input is not used, it should be connected to the Vrefout pin or AC-coupled to analog ground. MIC2 - Analog Mono Source, Input, Pin 22 This analog input is a monophonic source to the analog output mixer. It is intended to be used as an alternate microphone connection to the audio subsystem. The CS4202 internal mixer's microphone input is MUX selectable with either MIC1 or MIC2 as the input. The maximum allowable input is 1 VRMS (sinusoidal). This input is internally biased at the Vrefout voltage reference and requires AC-coupling to external circuitry. If this input is not used, it should be connected to the Vrefout pin or AC-coupled to analog ground. LINE_IN_L, LINE_IN_R - Analog Line Source, Inputs, Pins 23 and 24 These inputs form a stereo input pair to the CS4202. The maximum allowable input is 1 V RMS (sinusoidal). These inputs are internally biased at the Vrefout voltage reference and require AC-coupling to external circuitry. If these inputs are not used, they should both be connected to the Vrefout pin or AC-coupled to analog ground. CD_L, CD_R - Analog CD Source, Inputs, Pins 18 and 20 These inputs form a stereo input pair to the CS4202. It is intended to be used for the Red Book CD audio connection to the audio subsystem. The maximum allowable input is 1 VRMS (sinusoidal). These inputs are internally biased at the Vrefout voltage reference and require AC-coupling to external circuitry. If these inputs are not used, they should both be connected to the Vrefout pin or AC-coupled to analog ground. CD_C - Analog CD Common Source, Input, Pin 19 This analog input is used to remove common mode noise from Red Book CD audio signals. The impedance on the input signal path should be one half the impedance on the CD_L and CD_R input paths. This pin requires AC-coupling to external circuitry. If this input is not used, it should be connected to the Vrefout pin or AC-coupled to analog ground. DS549PP2 57 CS4202 VIDEO_L, VIDEO_R - Analog Video Audio Source, Inputs, Pins 16 and 17 These inputs form a stereo input pair to the CS4202. It is intended to be used for the audio signal output of a video device. The maximum allowable input is 1 VRMS (sinusoidal). These inputs are internally biased at the Vrefout voltage reference and require AC-coupling to external circuitry. If these inputs are not used, they should both be connected to the Vrefout pin or AC-coupled to analog ground. AUX_L, AUX_R - Analog Auxiliary Source, Inputs, Pins 14 and 15 These inputs form a stereo input pair to the CS4202. The maximum allowable input is 1 V RMS (sinusoidal). These inputs are internally biased at the Vrefout voltage reference and require AC-coupling to external circuitry. If these inputs are not used, they should both be connected to the Vrefout pin or AC-coupled to analog ground. LINE_OUT_L, LINE_OUT_R - Analog Line-Level, Outputs, Pins 35 and 36 These signals are analog outputs from the stereo output mixer. The full-scale output voltage for each output is nominally 1 VRMS (sinusoidal). These outputs are internally biased at the Vrefout voltage reference and require either AC-coupling to external circuitry or DC-coupling to a buffer op-amp biased at the Vrefout voltage. These pins need a 680-1000 pF NPO capacitor attached to analog ground. HP_OUT_L, HP_OUT_R - Analog Headphone, Outputs, Pins 39 and 41 These signals are analog outputs from the stereo output mixer. The full-scale output voltage for each output is nominally 4 Vpp. These outputs are internally biased at the Vrefout voltage reference and require AC-coupling to external circuitry. The HP_OUT pins can directly drive resistive loads as low as 32 Ω (such as standard consumer headphones). Capacitive loading must not exceed 200 pF per pin. The outputs are short circuit protected for infinite duration. HP_OUT_C - Analog Headphone Output Common Source, Input, Pin 40 This analog input is used to remove common mode noise from the headphone outputs. This is achieved by biasing the headphone amplifier with the common mode noise on the headphone amplifier ground plane. This pin should be AC-coupled through a 1 µF electrolytic capacitor to analog ground (AVss2) near the headphone jack. MONO_OUT - Analog Mono Line-Level, Output, Pin 37 This signal is an analog output from the stereo-to-mono mixer. The full-scale output voltage for this output is nominally 1 VRMS (sinusoidal). This output is internally biased at the Vrefout voltage reference and requires either AC-coupling to external circuitry or DC-coupling to a buffer op-amp biased at the Vrefout voltage. This pin needs a 680-1000 pF NPO capacitor attached to analog ground. Analog Reference, Filter, and Configuration Pins REFFLT - Internal Reference Voltage, Input, Pin 27 This signal is the voltage reference used internal to the CS4202. A 0.1 µF and a 2.2 µF ceramic capacitor with short, wide traces must be connected to this pin. No other connections should be made to this pin. Do not use an electrolytic 2.2 µF capacitor, use a type Z5U or Y5V ceramic capacitor. Vrefout - Voltage Reference, Output, Pin 28 All analog inputs and outputs are centered around Vrefout, nominally 2.4 Volts. This pin may be used to bias external amplifiers. It can also drive up to 5 mA of DC which can be used for microphone bias. 58 DS549PP2 CS4202 AFLT1 - Left ADC Channel Antialiasing Filter, Input, Pin 29 This pin needs a 1000 pF NPO capacitor connected to analog ground. AFLT2 - Right ADC Channel Antialiasing Filter, Input, Pin 30 This pin needs a 1000 pF NPO capacitor connected to analog ground. HPCFG - Headphone Configuration, Input, Pin 31 This pin is the configuration control for the signal routing to the headphone amplifier. If this pin is left floating, the LINE_OUT and HP_OUT pins function as defined in the AC ’97 specification. If the HPCFG pin is grounded, the HP_OUT pins behave as a buffered line output. In addition, the LINE_OUT pins are muted, the control register for the headphone output will be the Master Output Volume Register (Index 02h), and PC_BEEP is routed to the HP_OUT pins during RESET. The HPCFG pin is internally pulled up to the analog supply voltage. AC-Link Pins RESET# - AC ’97 Chip Reset, Input, Pin 11 This active low signal is the asynchronous Cold Reset input to the CS4202. The CS4202 must be reset before it can enter normal operating mode. SYNC - AC-Link Serial Port Sync Pulse, Input, Pin 10 SYNC is the serial port timing signal for the AC-link. Its period is the reciprocal of the maximum sample rate, 48 kHz. The signal is generated by the controller and is synchronous to BIT_CLK. SYNC is an asynchronous input when the CS4202 is configured as a primary codec and is in a PR4 powerdown state. A series terminating resistor of 47 Ω should be connected on this signal close to the controller. BIT_CLK - AC-Link Serial Port Master Clock, Input/Output, Pin 6 This input/output signal controls the master clock timing for the AC-link. In primary mode, this signal is a 12.288 MHz output clock derived from either a 24.576 MHz crystal or from the internal PLL based on the XTL_IN input clock. When the CS4202 is in secondary mode, this signal is an input which controls the AC-link serial interface and generates all internal clocking including the AC-link serial interface timing and the analog sampling clocks. A series terminating resistor of 47 Ω should be connected on this signal close to the CS4202 in primary mode or close to the BIT_CLK source in secondary mode. SDATA_OUT - AC-Link Serial Data Input Stream to AC ’97, Input, Pin 5 This input signal receives the control information and digital audio output streams. The data is clocked into the CS4202 on the falling edge of BIT_CLK. A series terminating resistor of 47 Ω should be connected on this signal close to the controller. SDATA_IN - AC-Link Serial Data Output Stream from AC ’97, Output, Pin 8 This output signal transmits the status information and digital audio input streams from the ADCs. The data is clocked out of the CS4202 on the rising edge of BIT_CLK. A series terminating resistor of 47 Ω should be connected on this signal close to the CS4202. DS549PP2 59 CS4202 Clock and Configuration Pins XTL_IN - Crystal Input / Clock Input, Pin 2 This pin requires either a 24.576 MHz crystal, with the other pin attached to XTL_OUT, or an external CMOS clock. XTL_IN must have a crystal or clock source attached for proper operation except when operating in secondary codec mode. The crystal frequency must be 24.576 MHz and designed for fundamental mode, parallel resonance operation. If an external CMOS clock is used to drive this pin, it must run at one of these acceptable frequencies: 14.31818, 24.576, 27, or 48 MHz. When configured as a secondary codec, all timing is derived from the BIT_CLK input signal and this pin should be left floating. See Section 9, Clocking, for additional details. XTL_OUT - Crystal Output / PLL Loop Filter, Pin 3 This pin is used for a crystal placed between this pin and XLT_IN. If an external 24.576 MHz clock is used on XTL_IN, this pin must be left floating with no traces or components connected to it. If one of the other acceptable clocks is used on XTL_IN, this pin must be connected to a loop filter circuit. See Section 9, Clocking, for additional details. ID1#, ID0# - Codec ID, Inputs, Pins 45 and 46 These pins select the Codec ID for the CS4202, as well as determine the rate of the incoming clock in PLL mode. They are only sampled after the rising edge of RESET#. These pins are internally pulled up to the digital supply voltage and should be left floating for logic ‘0’ or tied to digital ground for logic ‘1’. Misc. Digital Interface Pins SPDIF_OUT - Sony/Philips Digital Interface, Output, Pin 48 This pin generates the S/PDIF digital output from the CS4202 when the SPDIF bit in the Extended Audio Status/Control Register (Index 2Ah) is ‘set’. This output may be used to directly drive a resistive divider and coupling transformer to an RCA-type connector for use with consumer audio equipment. When this function is not being used this output is driven to a logic ‘0’. EAPD/SCLK - External Amplifier Powerdown / Serial Clock, Output, Pin 47 This pin is used to control the powerdown state of an audio amplifier external to the CS4202. The output is controlled by the EAPD bit in the Powerdown Ctrl/Stat Register (Index 26h). It is driven as a normal CMOS output and defaults low (‘0’) upon power-up. This pin also provides the serial clock for both serial data ports when the SDSC bit in the Serial Port Control Register (Index 6Ah) is ‘set’. GPIO0/LRCLK - General Purpose I/O / Left-Right Clock, Input/Output, Pin 43 This pin is a general purpose I/O pin that can be used to interface with various external circuitry. When configured as an input, it functions as a Schmitt triggered input with 350 mV hysteresis at 5 V and 220 mV hysteresis at 3.3 V. When configured as an output, it can function as a normal CMOS output (4 mA drive) or as an open drain output. This pin also provides the L/R clock for both serial data ports when the SDEN bit in the Serial Port Control Register (Index 6Ah) is ‘set’. This pin powers up in the high impedance state for backward compatibility. GPIO1/SDOUT - General Purpose I/O / Serial Data Output, Input/Output, Pin 44 This pin is a general purpose I/O pin that can be used to interface with various external circuitry. When configured as an input, it functions as a Schmitt triggered input with 350 mV hysteresis at 5 V and 220 mV hysteresis at 3.3 V. When configured as an output, it can function as a normal CMOS output (4 mA drive) or as an open drain output. This pin also provides the serial data for the first serial data port when the SDEN bit in the Serial Port Control Register (Index 6Ah) is ‘set’. This pin powers up in the high impedance state for backward compatibility. 60 DS549PP2 CS4202 GPIO2 - General Purpose I/O, Input/Output, Pin 32 This pin is a general purpose I/O pin that can be used to interface with various external circuitry. When configured as an input, it functions as a Schmitt triggered input with 350 mV hysteresis at 5 V and 220 mV hysteresis at 3.3 V. When configured as an output, it can function as a normal CMOS output (4 mA drive) or as an open drain output. This pin powers up in the high impedance state for backward compatibility. GPIO3 - General Purpose I/O, Input/Output, Pin 33 This pin is a general purpose I/O pin that can be used to interface with various external circuitry. When configured as an input, it functions as a Schmitt triggered input with 350 mV hysteresis at 5 V and 220 mV hysteresis at 3.3 V. When configured as an output, it can function as a normal CMOS output (4 mA drive) or as an open drain output. This pin powers up in the high impedance state for backward compatibility. GPIO4/SDO2 - General Purpose I/O / Serial Data Output 2, Input/Output, Pin 34 This pin is a general purpose I/O pin that can be used to interface with various external circuitry. When configured as an input, it functions as a Schmitt triggered input with 350 mV hysteresis at 5 V and 220 mV hysteresis at 3.3 V. When configured as an output, it can function as a normal CMOS output (4 mA drive) or as an open drain output. This pin also provides the serial data for the second serial data port when the SDO2 bit in the Serial Port Control Register (Index 6Ah) is ‘set’. This pin powers up in the high impedance state for backward compatibility. Power Supply Pins DVdd1, DVdd2 - Digital Supply Voltage, Pins 1 and 9 Digital supply voltage for the AC-link section of the CS4202. These pins can be tied to +5 V digital or to +3.3 V digital. The CS4202 and controller’s AC-link should share a common digital supply. DVss1, DVss2 - Digital Ground, Pins 4 and 7 Digital ground connection for the AC-link section of the CS4202. These pins should be isolated from analog ground currents. AVdd1, AVdd2 - Analog Supply Voltage, Pins 25 and 38 Analog supply voltage for the analog and mixed signal section of the CS4202 (AVdd1) as well as the headphone amplifier (AVdd2). These pins must be tied to the analog +5 V power supply. It is strongly recommended that +5 V be generated from a voltage regulator to ensure proper supply currents and noise immunity from the rest of the system. AVss1, AVss2 - Analog Ground, Pins 26 and 42 Ground connection for the analog, mixed signal, and substrate sections of the CS4202 (AVss1) as well as the headphone amplifier (AVss2). These pins should be isolated from digital ground currents. DS549PP2 61 CS4202 13. PARAMETER AND TERM DEFINITIONS AC ’97 Specification Refers to the Audio Codec ’97 Component Specification Ver 2.2 published by the Intel® Corporation [6]. AC ’97 Controller or Controller Refers to the control chip which interfaces to the audio codec AC-link. This has been also called DC ’97 for Digital Controller ’97 [6]. AC ’97 Registers or Codec Registers Refers to the 64-field register map defined in the AC ’97 Specification. ADC Refers to a single Analog-to-Digital converter in the CS4202. “ADCs” refers to the stereo pair of Analog-to-Digital converters. The CS4202 ADCs have 18-bit resolution. Codec Refers to the chip containing the ADCs, DACs, and analog mixer. In this data sheet, the codec is the CS4202. DAC Refers to a single Digital-to-Analog converter in the CS4202. “DACs” refers to the stereo pair of Digital-to-Analog converters. The CS4202 DACs have 20-bit resolution. dB FS A dB FS is defined as dB relative to full-scale. The “A” indicates an A weighting filter was used. Differential Nonlinearity The worst case deviation from the ideal code width. Units in LSB. Dynamic Range (DR) DR is the ratio of the RMS full-scale signal level divided by the RMS sum of the noise floor, in the presence of a signal, available at any instant in time (no change in gain settings between measurements). Measured over a 20 Hz to 20 kHz bandwidth with units in dB FS A. FFT Fast Fourier Transform. Frequency Response (FR) FR is the deviation in signal level verses frequency. The 0 dB reference point is 1 kHz. The amplitude corner, Ac, lists the maximum deviation in amplitude above and below the 1 kHz reference point. The listed minimum and maximum frequencies are guaranteed to be within the Ac from minimum frequency to maximum frequency inclusive. Fs Sampling Frequency. Interchannel Gain Mismatch For the ADCs, the difference in input voltage to get an equal code on both channels. For the DACs, the difference in output voltages for each channel when both channels are fed the same code. Units are in dB. 62 DS549PP2 CS4202 Interchannel Isolation The amount of 1 kHz signal present on the output of the grounded AC-coupled line input channel with 1 kHz, 0 dB, signal present on the other line input channel. Units are in dB. Line-level Refers to a consumer equipment compatible, voltage driven interface. The term implies a low driver impedance and a minimum 10 kΩ load impedance. PATHS A-D: Analog in, through the ADCs, onto the serial link. D-A: Serial interface inputs through the DACs to the analog output. A-A: Analog in to Analog out (analog mixer). PC 99 Refers to the PC 99 System Design Guide published by the Microsoft® Corporation [7]. PC 2001 Refers to the PC 2001 System Design Guide published by the Microsoft® Corporation [8]. PLL Phase Lock Loop. Circuitry for generating a desired clock from an external clock source. Resolution The number of bits in the output words to the DACs, and in the input words to the ADCs. Signal to Noise Ratio (SNR) SNR, similar to DR, is the ratio of an arbitrary sinusoidal input signal to the RMS sum of the noise floor, in the presence of a signal. It is measured over a 20 Hz to 20 kHz bandwidth with units in dB. S/PDIF Sony/Phillips Digital Interface. This interface was established as a means of digitally interconnecting consumer audio equipment. The documentation for S/PDIF has been superseded by the IEC-958 consumer digital interface document. SRC Sample Rate Converter. Converts data derived at one sample rate to a differing sample rate. The CS4202 operates at a fixed sample frequency of 48 kHz. The internal sample rate converters are used to convert digital audio streams playing back at other frequencies to 48 kHz. Total Harmonic Distortion plus Noise (THD+N) THD+N is the ratio of the RMS sum of all non-fundamental frequency components, divided by the RMS full-scale signal level. It is tested using a -3 dB FS input signal and is measured over a 20 Hz to 20 kHz bandwidth with units in dB FS. DS549PP2 63 2700pF X7R 10uF ELEC 0.1uF X7R 2 R2 4.7K 0.1uF X7R 10uF ELEC C2 + C3 C4 GND 33 9 1 26 42 25 1uF Y5V 3.3V. U2 38 GPIO3 DVdd2 DVdd1 AVss1 AVss2 4 7 DVss1 DVss2 6 AVdd1 AVdd2 3 5 23 + 2 1 22 17 40 31 + XTL_IN 2 2 3 XTL_OUT 64 +12V C1 1 IN OUT 3 BEEP IN U1 MC78M05ACDT +5VA 0.1uF X7R J1 R1 47K 2 1 C5 + C6 DGND DGND C7 1uF Y5V +3.3VD AGND AGND AGND LINE OUT JACK C8 J3 4 3 CD IN J2 C9 1uF Y5V R3 100K 14. REFERENCE DESIGN 4 3 For 2 channel configuration C14 R4 C10 C11 C12 C13 1uF Y5V 220K 2 1 R5 100K GPIO3 (pin 33) is tied to C15 0.1uF X7R 0.1uF X7R 0.1uF X7R 0.1uF X7R AC LINK PCI Audio Controller or ICH C17 C16 1000pF NPO 1000pF NPO R6 1uF Y5V 5 2 1 220K R7 AGND 100K Controller 47 47 R8 R9 BIT_CLK SDATA_OUT DGND CS4202 RESET# 12 15 14 LINE_OUT_R LINE_OUT_L GPIO2 32 20 19 AUX_L CD_R PC_BEEP AUX_R 36 35 SDATA_IN SYNC 10 11 5 8 AGND BITCLK SDATAOUT SDATAIN0 SYNC RESET# AGND AGND +3.3VD HP SENSE C19 220uF ELEC R13 10K R10 10K HEADPHONE JACK J5 7 LINE IN C18 LINE_IN_R LINE_IN_L HP_OUT_R HP_OUT_L HP_OUT_C 41 39 MIC2 VIDEO_R VIDEO_L 37 PHONE Vrefout EAPD/SCLK MIC1 45 46 REFFLT AFLT1 AFLT2 GPIO0/LRCLK GPIO1/SDOUT GPIO4/SDO2 SPDIF_OUT 34 48 43 44 ID0# ID1# 47 HPCFG MONO_OUT J4 R11 6.8K 4 1uF Y5V 18 24 CD_C CD_L R12 C20 6.8K 220uF ELEC 6 2 R14 28 21 27 29 30 6.8K C21 1uF Y5V 16 13 C22 R15 10K 3 1uF Y5V 1 R16 6.8K AGND DGND S/PDIF OUT J6 4 PHONE IN C23 C24 NO POP AGND AGND J7 1uF Y5V R17 6.8K +5VD 3 2 1 5 1 R19 6.8K +5VA AGND C25 2.2uF Y5V C26 0.1uF X7R C27 1000pF NPO C28 1000pF NPO R18 6.8K C29 0.1uF X7R 6 2.2uF capacitor can be replaced by two 1uF capacitors. Y1 DGND DGND DGND AGND R20 1.5K MIC IN 24.576 MHz (50 PPM) J8 R21 2.2K 4 3 5 C30 2 1 1uF Y5V + C33 10uF ELEC DGND C31 22pF NPO 0.050 inch C32 22pF NPO GND_TIE DGND DGND AGND Tie at one AGND AGND point only under the codec CS4202 DS549PP2 Figure 28. CS4202 Reference Design CS4202 15. REFERENCES 1) Cirrus Logic, Audio Quality Measurement Specification, Version 1.0, 1997 http://www.cirrus.com/products/papers/meas/meas.html 2) Cirrus Logic, AN18: Layout and Design Rules for Data Converters and Other Mixed Signal Devices, Version 6.0, February 1998 3) Cirrus Logic, AN22: Overview of Digital Audio Interface Data Structures, Version 2.0, February 1998 4) Cirrus Logic, AN134: AES and S/PDIF Recommended Transformers, Version 2, April 1999 5) Cirrus Logic, AN165: CS4297A/CS4299 EMI Reduction Techniques, Version 1.0, September 1999 6) Intel®, Audio Codec ’97 Component Specification, Revision 2.2, September 2000 http://developer.intel.com/ial/scalableplatforms/audio/index.htm 7) Microsoft®, PC 99 System Design Guide, Version 1.0, July 1999 http://www.microsoft.com/hwdev/desguid/ 8) Microsoft®, PC 2001 System Design Guide, Version 1.0, November 2000 http://www.pcdesguide.org/pc2001/default.htm 9) Intel® 82801AA (ICH) and 82801AB (ICH0) I/O Controller Hub, June 1999 http://developer.intel.com/design/chipsets/datashts/290655.htm 10) Intel® 82801BA (ICH2) I/O Controller Hub, October 2000 http://developer.intel.com/design/chipsets/datashts/290687.htm 11) Intel® 82801CAM (ICH3-M) I/O Controller Hub, July 2001 http://developer.intel.com/design/chipsets/datashts/290716.htm DS549PP2 65 CS4202 16. PACKAGE DIMENSIONS 48L LQFP PACKAGE DRAWING E E1 D D1 1 e ∝ B A A1 L INCHES NOM 0.055 0.004 0.009 0.354 0.28 0.354 0.28 0.020 0.24 4° MILLIMETERS NOM 1.40 0.10 0.22 9.0 BSC 7.0 BSC 9.0 BSC 7.0 BSC 0.50 BSC 0.60 4° MIN --0.002 0.007 0.343 0.272 0.343 0.272 0.016 0.018 0.000° ∝ * Nominal pin pitch is 0.50 mm Controlling dimension is mm. JEDEC Designation: MS022 DIM A A1 B D D1 E E1 e* L MAX 0.063 0.006 0.011 0.366 0.280 0.366 0.280 0.024 0.030 7.000° MIN --0.05 0.17 8.70 6.90 8.70 6.90 0.40 0.45 0.00° MAX 1.60 0.15 0.27 9.30 7.10 9.30 7.10 0.60 0.75 7.00° 66 DS549PP2