EVAL-ADV7281EBZ

ADV7280/ADV7281/ADV7282/ADV7283 Hardware Reference Manual UG-637 One Technology Way • P.O. Box 9106 • Norwood, MA 02062-9106, U.S.A. • Tel: 781.329.4700 • Fax: 781.461.3113 • www.analog.com ADV7280/ADV7281/ADV7282/ADV7283 Functionality and Features OVERVIEW This user guide provides a detailed description of the functionality and features of the ADV7280, ADV7280-M, ADV7281, ADV7281-M, ADV7281-MA, ADV7282, ADV7282-M, and ADV7283 video decoders. Table 1 list the shorthand notations used for these decoders in this user guide. The ADV7280, ADV7280-M, ADV7281, ADV7281-M, ADV7281-MA, ADV7282, ADV7282-M, and ADV7283 automatically detect and convert standard composite analog baseband video signals compatible with worldwide NTSC, PAL, and SECAM standards. These video recorders accept composite video signals (CVBS) as well as S-Video (YC) and YPbPr video signals, supporting a wide range of consumer and automotive video sources. The ADV7281, ADV7281-M, ADV7281-MA, ADV7282, ADV7282-M, and ADV7283 models can also accept pseudo differential and true differential CVBS inputs. The ADV728x-T models (ADV7280, ADV7281, ADV7282, and ADV7283) convert the analog video inputs into a YCrCb 4:2:2 component video data stream that is compatible with the 8-bit ITU-R BT.656 interface standard. The ADV728x-M models (ADV7280-M, ADV7281-M, ADV7281-MA, and ADV7282-M) convert the analog video inputs into an 8-bit YcrCb 4:2:2 video stream, and that is output over an MIPI CSI-2 interface. This MIPI CSI-2 output interface connects to a wide range of video processors and FPGAs. The AGC and clamp-restore circuitry allow an input video signal peak-to-peak range to 1.0 V at the analog video input pin of the ADV728x. Alternatively, these can be bypassed for manual settings. AC coupling of the input video signals provides STB protection. On the ADV7281, ADV7281-M, ADV7282, and ADV7282-M models, short-to-battery (STB) diagnostics can be carried out on two input video signals. The ADV728x is programmed via a two-wire, serial, bidirectional port (I2C® compatible). The ADV728x supports a number of functions including 8-bit to 6-bit down dither mode and adaptive contrast enhancement (ACE). The advanced interlaced-to-progressive (I2P) function allows the ADV7280, ADV7280-M, ADV7282, ADV7282-M, and ADV7283 to convert an interlaced video input into a progressive video output. This function is performed without the need for external memory. Edge adaptive technology is used to minimize video defects on low angle lines. The ADV728x is fabricated in a 1.8 V CMOS process. Its monolithic CMOS construction ensures greater functionality with lower power dissipation. The ADV728x are available in −40°C to +85°C temperature range models. This makes the ADV728x ideal for automotive applications. See Table 6 for a descriptive list of these video decoder models. Rev. A | Page 1 of 104 UG-637 ADV7280/ADV7281/ADV7282/ADV7283 Hardware Reference Manual TABLE OF CONTENTS Overview ............................................................................................ 1 Identification ............................................................................... 28 Revision History ............................................................................... 3 Status 1 ......................................................................................... 28 Using this Hardware Reference Guide ........................................... 4 Status 2 ......................................................................................... 28 Generic Shorthand Notations ..................................................... 4 Status 3 ......................................................................................... 28 Number Notations ........................................................................ 4 Autodetection Result ................................................................. 29 Register Access Conventions ...................................................... 4 Video Processor .............................................................................. 30 Acronyms and Abbreviations ..................................................... 4 SD Luma Path ............................................................................. 30 Field Function Descriptions........................................................ 5 SD Chroma Path ......................................................................... 30 Video Decoder Models .................................................................... 6 ACE, I2P, and Dither Processing Blocks ................................. 30 Video Input Pins Column ........................................................... 7 Sync Processing .......................................................................... 31 Differential AFE Column ............................................................ 7 VBI Data Recovery ..................................................................... 31 Output Format Column .............................................................. 7 General Setup .............................................................................. 31 Diagnostic Pins Column ............................................................. 7 Color Controls ............................................................................ 34 GPO Pins Column........................................................................ 7 Free-Run Operation ................................................................... 35 Sync Output Pins Column .......................................................... 7 Clamp Operation ........................................................................ 36 ACE Column ................................................................................. 7 Luma Filter .................................................................................. 37 I2P Column ................................................................................... 7 Chroma Filter.............................................................................. 40 Package Column ........................................................................... 7 Gain Operation ........................................................................... 41 Functional Block Diagrams......................................................... 8 Chroma Transient Improvement (CTI) .................................. 44 General Description ....................................................................... 11 Digital Noise Reduction (DNR) and Luma Peaking Filter ... 45 Overview of Analog Front End ................................................ 11 Comb Filters................................................................................ 46 Overview of Standard Definition Processor ........................... 11 IF Filter Compensation ............................................................. 48 Input Networks ............................................................................... 12 Adaptive Contrast Enhancement (ACE)................................. 49 Single-Ended Input Network .................................................... 12 Dither Function .......................................................................... 50 Differential Input Network ....................................................... 12 I2P Function ............................................................................... 50 Short-to-Battery Protection ...................................................... 13 Output Video Format..................................................................... 51 Short-to-Battery (STB) Diagnostics ............................................. 14 Swap Color output...................................................................... 51 Programming Diagnostic Slice Levels ..................................... 15 Output Format Control ............................................................. 51 Programming Diagnostic Interrupt ......................................... 16 ITU-R BT.656 Output .................................................................... 52 Programming INTRQ Hardware Interrupt ............................ 17 ITU-R BT.656 Output Control Registers ................................ 53 Analog Front End ........................................................................... 18 MIPI CSI-2 Tx Output ................................................................... 55 Input Configuration ................................................................... 18 Ultralow Power State.................................................................. 55 Manual Muxing Mode ............................................................... 21 I C Port Description ....................................................................... 57 Antialiasing Filters.......................................................................... 25 Register Maps .............................................................................. 59 Antialiasing Filter Configuration ............................................. 25 PCB Layout Recommendations.................................................... 61 Global Control Registers ............................................................... 26 Analog Interface Inputs ............................................................. 61 Power Saving Mode and Reset Control ................................... 26 Power Supply Decoupling ......................................................... 61 Global Pin Control ..................................................................... 26 VREFN and VREFP Pins .......................................................... 61 General-Purpose Output Controls .......................................... 27 Digital Outputs ........................................................................... 61 Global Status Register .................................................................... 28 Exposed Metal Pad ..................................................................... 61 2 Rev. A| Page 2 of 104 ADV7280/ADV7281/ADV7282/ADV7283 Hardware Reference Manual UG-637 Digital Inputs ...............................................................................61 Interrupt/VDP Sub Map Description ...................................... 90 MIPI Outputs (D0P, D0N, CLKP, CLKN) ...............................61 VPP Map Description ................................................................ 99 Power Supply Requirements ..........................................................62 CSI Map Description ................................................................100 I C Register Maps ............................................................................63 References ......................................................................................103 2 User Sub Map Description .........................................................70 User Sub Map 2 Description ......................................................88 REVISION HISTORY 9/14—Rev. 0 to Rev. A Added ADV7283 (Throughout)...................................................... 1 Changes to Single-Ended Input Network Section and Differential Input Network Section ..............................................12 Added Short-to-Battery Protection Section ................................13 Changes to Short-to-Battery (STB) Diagnostics Section ...........14 Changes to Table 9 and Table 11 ...................................................15 Added Programming Diagnostic Interrupt Section ...................16 Added Programming INTRQ Hardware Interrupt Section ......17 Changes to Table 27 ........................................................................26 Added Output Format Control Section and Table 75 ................51 Changes to Table 86 and Table 87 .................................................54 Changes to Analog Interface Inputs Section and Digital Outputs Section ..............................................................................................61 Added Register 0x53 to Register 0x55; Table 106 .......................94 Changes to Register 0x5B; Table 107 ............................................99 5/14—Revision 0: Initial Version Rev. A | Page 3 of 104 UG-637 ADV7280/ADV7281/ADV7282/ADV7283 Hardware Reference Manual USING THIS HARDWARE REFERENCE GUIDE GENERIC SHORTHAND NOTATIONS REGISTER ACCESS CONVENTIONS Table 1. Shorthand Notations Table 3. Register Access Conventions Notation ADV728x Mode R/W R ADV728x-T ADV728x-M Description Refers to the ADV7280, ADV7280-M, ADV7281, ADV7281-M, ADV7281-MA, ADV7282, ADV7282-M, and ADV7283 models Refers to the ADV7280, ADV7281, ADV7282, and ADV7283 models Refers to the ADV7280-M, ADV7281-M, ADV7281-MA, and ADV7282-M models Table 2. Number Notations V[X:Y] 0xNN 0bNN NN ACRONYMS AND ABBREVIATIONS Table 4. Acronyms and Abbreviations NUMBER NOTATIONS Notation Bit N W Description Memory location has read and write access. Memory location is read access only. A read always returns 0 unless otherwise specified. Memory location is write access only. Description Bits are numbered in little endian format, that is, the least significant bit of a number is referred to as Bit 0. Bit field representation covering Bit X to Bit Y of a value or a field (V). Hexadecimal (Base 16) numbers are preceded by the prefix 0x. Binary (Base 2) numbers are preceded by the prefix 0b. Decimal (Base 10) are represented using no additional prefixes or suffixes. Acronym/ Abbreviation AA ACE ADC AFE AGC AIN CMR CVBS AVI DE GPO HS I2P IC I2 C LLC LSB Mbps ms MSB MIPI CSI-2 NC PLL Rx SAV SFL SHA SNR STB TTL Tx VBI VS XTAL Rev. A | Page 4 of 104 Description Anti-alias Adaptive contrast enhancement Analog-to-digital converter Analog front end Automatic gain control Analog video input pin Common-mode rejection Composite video baseband signal Auxiliary video information Data enable General-purpose output Horizontal synchronization Interlaced-to-progressive converter (that is, deinterlacer) Integrated circuit Inter integrated circuit Line locked clock Least significant bit Megabits per second Millisecond Most significant bit Mobile industry processor interface camera serial interface, version 2 No connect Phase-locked loop Receiver Start of active video Color subcarrier frequency lock Sample-and-hold Signal-to-noise ratio Short-to-battery Transistor-to-transistor level Transmitter Vertical blanking interval Vertical synchronization Crystal oscillator ADV7280/ADV7281/ADV7282/ADV7283 Hardware Reference Manual UG-637 FIELD FUNCTION DESCRIPTIONS In this example Throughout this reference manual, a series of function tables are provided. The function of a field is described in a table preceded by the bit name, a short function description, the I2C map, the register location within the I2C map, and a detailed description of the field. • The name of the field is DIAG1_SLICE_LEVEL and it is three bits long. • User Sub Map indicates which I2C map or sub map the field is located in. • Address 0x5D is the I2C location of the field within the I2C Map or Sub Map. The address is stated in a big endian format (MSB first, LSB last). • The address is followed by a description of the field. • The first column of the table lists values the field can take or can be set to. These values are in binary format if not preceded by 0x or in hexadecimal format if preceded by 0x. • The second column of the table describes the operation of the field (such as DIAG1_SLICE_LEVEL) for each value the field can be set to. The detailed description consists of: • • the values the field can take (for a readable field) the values the field can be set to (for a writable field) Example Field Function Description This section provides an example of a field function table followed by a description of each part of the table. DIAG1_SLICE_LEVEL[2:0], User Sub Map, Address 0x5D[4:2] The DIAG1_SLICE_LEVEL[2:0] bits allow the user to set the diagnostic slice level for the DIAG1 pin. Table 5. DIAG1_SLICE_LEVEL[2:0] Settings DIAG1_SLICE_LEVEL[2:0] 000 001 010 011 (default) 100 101 110 111 Diagnostic Slice Level 75 mV 225 mV 375 mV 525 mV 675 mV 825 mV 975 mV 1.125 V Rev. A | Page 5 of 104 UG-637 ADV7280/ADV7281/ADV7282/ADV7283 Hardware Reference Manual VIDEO DECODER MODELS Table 6 lists the Analog Devices, Inc., video decoders described in this reference manual. Select columns are described in full in the sections that follow. Table 6. Description of ADV728x Models Model Number ADV7280 Generic Shorthand Notation ADV728x-T Video Input Pins 4 Differential AFE No Output Format TTL Diagnostic Pins No GPO Pins No Sync Output Pins Yes (2) ACE Yes I2P Yes ADV7281 ADV728x-T 4 Yes TTL Yes (2) No No Yes No ADV7282 ADV728x-T 4 Yes TTL Yes (2) No No Yes Yes ADV7283 ADV728x-T 6 Yes TTL No No No Yes Yes ADV7280-M ADV728x-M 8 No MIPI CSI-2 No Yes (3) No Yes Yes ADV7281-M ADV728x-M 6 Yes MIPI CSI-2 Yes (2) Yes (3) No Yes No ADV7281-MA ADV728x-M 8 Yes MIPI CSI-2 No Yes (3) No Yes No ADV7282-M ADV728x-M 6 Yes MIPI CSI-2 Yes (2) Yes (3) No Yes Yes Rev. A | Page 6 of 104 Package 32-lead LFCSP, 5 mm × 5 mm 32-lead LFCSP, 5 mm × 5 mm 32-lead LFCSP, 5 mm × 5 mm 32-lead LFCSP, 5 mm × 5 mm 32-lead LFCSP, 5 mm × 5 mm 32-lead LFCSP, 5 mm × 5 mm 32-lead LFCSP, 5 mm × 5 mm 32-lead LFCSP, 5 mm × 5 mm ADV7280/ADV7281/ADV7282/ADV7283 Hardware Reference Manual UG-637 VIDEO INPUT PINS COLUMN DIAGNOSTIC PINS COLUMN Indicates how many analog video inputs pins are available on each ADV728x model. Indicates if the ADV728x model has diagnostic pins and, if so, how many. Diagnostic pins are used to monitor analog video input lines for short-to-battery (STB) events. • One analog video input pin is required for single-ended CVBS inputs. • Two analog video input pins are required for pseudo differential and fully differential CVBS inputs. • Two analog video input pins are required for S-Video (YC) inputs. • Three analog video input pins are required for component (YPbPr) inputs. DIFFERENTIAL AFE COLUMN Indicates if the ADV728x model has a differential analog front end (AFE). A differential AFE is needed to process pseudo differential and fully differential CVBS inputs. OUTPUT FORMAT COLUMN Indicates the digital video output format output from each ADV728x model. • TTL means that the ADV728x model outputs 8-bit YUV video data over a TTL bus. • MIPI CSI-2 indicates that the ADV728x model outputs 8-bit YUV video data over a MIPI CSI-2 bus. This MIPI CSI-2 bus consists of one differential data channel (D0P, D0N) and one differential clock channel (CLKP, CLKN). GPO PINS COLUMN Indicates if the ADV728x model has general-purpose output (GPO) pins and, if so, how many. GPO pins are outputs from the ADV728x that can be used to control other external devices. SYNC OUTPUT PINS COLUMN Indicates if the video decoder has synchronization output pins and, if so, how many. Examples of synchronization output pins include horizontal synchronization (HS), vertical synchronization(VS), and subcarrier frequency lock (SFL). ACE COLUMN Indicates if the ADV728x model has the ability to perform the adaptive contrast enhancement (ACE) function. The ACE function allows dark areas of the video to be brightened up without saturating bright areas. This is useful for automotive applications. I2P COLUMN Indicates if the ADV728x model has an in-built interlaced-toprogressive converter (I2P). This is also known as a deinterlacer. The I2P core converts the interlaced video formats of NTSC (480i) or PAL (576i) into progressive standards (480p, 576p). PACKAGE COLUMN Indicates the package in which the video decoder is available. Rev. A | Page 7 of 104 UG-637 ADV7280/ADV7281/ADV7282/ADV7283 Hardware Reference Manual FUNCTIONAL BLOCK DIAGRAMS ADV7280 CLOCK PROCESSING BLOCK XTALP PLL ADLLT PROCESSING 10-BIT ADC DIGITAL PROCESSING BLOCK LLC XTALN + SHA AA FILTER VBI SLICER ADC – COLOR DEMOD AA FILTER I2P FIFO HS ACE DOWN DITHER I2C/CONTROL REFERENCE 8-BIT PIXEL DATA P7 TO P0 INTRQ 11935-001 AIN3 AIN4 AA FILTER 2D COMB VS/FIELD/SFL OUTPUT BLOCK ANALOG VIDEO INPUTS MUX BLOCK AIN1 AIN2 AA FILTER SCLK SDATA ALSB RESET PWRDWN Figure 1. ADV7280 Functional Block Diagram ADV7280-M CLKP CLOCK PROCESSING BLOCK XTALP PLL ADLLT PROCESSING 10-BIT ADC DIGITAL PROCESSING BLOCK MIPI Tx XTALN CLKN D0P 2D COMB + SHA AA FILTER ADC – VBI SLICER COLOR DEMOD AA FILTER I2P ACE DOWN DITHER I2C/CONTROL REFERENCE SCLK SDATA ALSB RESET PWRDWN Figure 2. ADV7280-M Functional Block Diagram Rev. A | Page 8 of 104 GPO0 GPO1 GPO2 INTRQ 11935-002 AA FILTER OUTPUT BLOCK AA FILTER MUX BLOCK ANALOG VIDEO INPUTS AIN1 AIN2 AIN3 AIN4 AIN5 AIN6 AIN7 AIN8 FIFO D0N ADV7280/ADV7281/ADV7282/ADV7283 Hardware Reference Manual ADV7281 UG-637 CLOCK PROCESSING BLOCK XTALP PLL ADLLT PROCESSING 10-BIT ADC DIGITAL PROCESSING BLOCK LLC 2D COMB + SHA AA FILTER ADC VBI SLICER – COLOR DEMOD AA FILTER DIAGNOSTICS DIAG1 ACE DOWN DITHER I2C/CONTROL REFERENCE DIAG2 8-BIT PIXEL DATA P7 TO P0 INTRQ 11935-003 AA FILTER OUTPUT BLOCK AIN3 AIN4 AA FILTER MUX BLOCK DIFFERENTIAL OR SINGLE-ENDED ANALOG VIDEO INPUTS AIN1 AIN2 FIFO XTALN SCLK SDATA ALSB RESET PWRDWN Figure 3. ADV7281 Functional Block Diagram ADV7281-M CLKP CLOCK PROCESSING BLOCK XTALP PLL ADLLT PROCESSING 10-BIT ADC DIGITAL PROCESSING BLOCK MIPI Tx XTALN CLKN D0P 2D COMB + SHA AA FILTER ADC VBI SLICER – COLOR DEMOD AA FILTER DIAGNOSTICS DIAG1 ACE DOWN DITHER GPO0 GPO1 GPO2 I2C/CONTROL REFERENCE INTRQ 11935-004 AIN5 AIN6 AA FILTER OUTPUT BLOCK AIN3 AIN4 AA FILTER MUX BLOCK DIFFERENTIAL OR SINGLE-ENDED ANALOG VIDEO INPUTS AIN1 AIN2 FIFO D0N SCLK SDATA ALSB RESET PWRDWN DIAG2 Figure 4. ADV7281-M Functional Block Diagram ADV7281-MA CLKP CLOCK PROCESSING BLOCK XTALP PLL MIPI Tx ADLLT PROCESSING XTALN CLKN D0P AA FILTER 2D COMB + SHA AA FILTER DIGITAL PROCESSING BLOCK ADC – VBI SLICER COLOR DEMOD AA FILTER ACE DOWN DITHER I2C/CONTROL REFERENCE SCLK SDATA ALSB RESET PWRDWN Figure 5. ADV7281-MA Functional Block Diagram Rev. A | Page 9 of 104 GPO0 GPO1 GPO2 INTRQ 11935-005 MUX BLOCK DIFFERENTIAL OR SINGLE-ENDED ANALOG VIDEO INPUTS AA FILTER OUTPUT BLOCK 10-BIT ADC AIN1 AIN2 AIN3 AIN4 AIN5 AIN6 AIN7 AIN8 FIFO D0N UG-637 ADV7280/ADV7281/ADV7282/ADV7283 Hardware Reference Manual ADV7282 CLOCK PROCESSING BLOCK XTALP PLL ADLLT PROCESSING 10-BIT ADC DIGITAL PROCESSING BLOCK LLC AIN3 AIN4 AA FILTER 2D COMB + AA FILTER VBI SLICER ADC SHA – COLOR DEMOD AA FILTER DIAGNOSTICS I2P DOWN DITHER I2C/CONTROL REFERENCE DIAG2 DIAG1 ACE 8-BIT PIXEL DATA P7 TO P0 INTRQ 11935-006 MUX BLOCK DIFFERENTIAL OR SINGLE-ENDED ANALOG VIDEO INPUTS OUTPUT BLOCK AA FILTER AIN1 AIN2 FIFO XTALN SCLK SDATA ALSB RESET PWRDWN Figure 6. ADV7282 Functional Block Diagram ADV7282-M CLKP CLOCK PROCESSING BLOCK XTALP PLL ADLLT PROCESSING 10-BIT ADC DIGITAL PROCESSING BLOCK MIPI Tx XTALN CLKN D0P AIN5 AIN6 + SHA AA FILTER ADC – VBI SLICER COLOR DEMOD AA FILTER DIAGNOSTICS DIAG1 I2P ACE DOWN DITHER GPO0 GPO1 GPO2 INTRQ I2C/CONTROL REFERENCE 11935-007 AIN3 AIN4 2D COMB AA FILTER OUTPUT BLOCK MUX BLOCK DIFFERENTIAL OR SINGLE-ENDED ANALOG VIDEO INPUTS AA FILTER AIN1 AIN2 FIFO D0N SCLK SDATA ALSB RESET PWRDWN DIAG2 Figure 7. ADV7282-M Functional Block Diagram ADV7283 CLOCK PROCESSING BLOCK LLC XTALP PLL ADLLT PROCESSING 10-BIT ADC DIGITAL PROCESSING BLOCK 2D COMB + SHA AA FILTER ADC – VBI SLICER COLOR DEMOD AA FILTER I2P REFERENCE ACE DOWN DITHER I2C/CONTROL SCLK SDATA ALSB RESET PWRDWN NOTES 1. SHA IS A SAMPLE-AND-HOLD AMPLIFIER CIRCUIT. Figure 8. ADV7283 Functional Block Diagram Rev. A | Page 10 of 104 8-BIT PIXEL DATA P0 TO P7 INTRQ 11935-108 AIN5 AIN6 AA FILTER OUTPUT BLOCK AIN3 AIN4 AA FILTER MUX BLOCK DIFFERENTIAL OR SINGLE-ENDED ANALOG VIDEO INPUTS AIN1 AIN2 FIFO XTALN UG-637 ADV7280/ADV7281/ADV7282/ADV7283 Hardware Reference Manual GENERAL DESCRIPTION 4.43, and SECAM B/D/G/K/L. The ADV728x can automatically detect the video standard and process it accordingly. OVERVIEW OF ANALOG FRONT END The ADV728x has a five-line, adaptive, 2D comb filter that gives superior chrominance and luminance separation when decoding a composite video signal. This highly adaptive filter automatically adjusts its processing mode according to the video standard and signal quality without requiring user intervention. Video user controls, such as brightness, contrast, saturation, and hue, are also available with these video decoders. The ADV728x AFE consists of a single high speed, 10-bit analog-to-digital converter (ADC) that digitizes the analog video signal before applying it to the standard definition processor. The front end also includes a four-channel input mux that enables multiple composite video signals to be applied to the ADV728x. Clamp restore circuitry is positioned in front of the ADC to ensure that the video signal remains within the range of the converter. An external resistor and capacitor circuit is required before each analog input channel to ensure that the input signal is kept within the range of the ADC (see the Input Networks section). Fine clamping of the video signal is performed downstream by digital fine clamping within the ADV728x. The ADV728x implements a patented ADLLT™ algorithm to track varying video line lengths from sources such as a VCR. ADLLT enables the ADV728x to track and decode poor quality video sources, such as VCRs and noisy sources, from tuner outputs and camcorders. The ADV728x contains a chroma transient improvement (CTI) processor that sharpens the edge rate of chroma transitions, resulting in sharper vertical transitions. Table 7 shows the three ADC clocking rates that are determined by the video input format to be processed—that is, INSEL[4:0]. These clock rates ensure 4× oversampling per channel for CVBS, Y/C, and YPbPr modes. ACE offers improved visual detail using an algorithm to automatically vary contrast levels in order to enhance picture detail. This increases the brightness of dark regions of an image without saturating bright areas of the image. Table 7. ADC Clock Rates Down dithering converts the output of the ADV728x from an 8-bit output to a 6-bit output. Input Format CVBS Y/C (S-Video) YPbPr 1 ADC Clock Rate (MHz)1 57.27 114 172 Oversampling Rate per Channel 4× 4× 4× Based on a 28.63636 MHz crystal between the XTAL and XTAL1 pins. OVERVIEW OF STANDARD DEFINITION PROCESSOR The ADV728x is capable of decoding a large selection of baseband video signals in composite, S-Video, and component formats. The ADV7281, ADV7281-M, ADV7281-MA, ADV7282, ADV7282-M, and ADV7283 are also capable of receiving pseudo-differential and fully differential CVBS inputs. The video standards supported by the video processor include PAL B/D/I/G/H, PAL 60, PAL M, PAL N, PAL Nc, NTSC M/J, NTSC The I2P block on the ADV7280, ADV7280-M, ADV7282, ADV7282-M, and ADV7283 converts the interlaced video input into a progressive video output. This is done without a need for external memory. The ADV728x can process a variety of vertical blanking interval (VBI) data services, such as closed captioning (CCAP), widescreen signaling (WSS), and copy generation management systems (CGMS). VBI data is transmitted as ancillary data packets. The ADV728x is fully Rovi (previously Macrovision) compliant; detection circuitry enables Type I, Type II, and Type III protection levels to be identified and reported to the user. The decoder is also fully robust to all Rovi signal inputs. Rev. A | Page 11 of 104 UG-637 ADV7280/ADV7281/ADV7282/ADV7283 Hardware Reference Manual INPUT NETWORKS An input network (external resistor and capacitor circuit) is required on the AINx input pins of the ADV728x. The components of the input network depend on the video format selected for the analog input. POSITIVE INPUT CONNECTOR 1.3kΩ SINGLE-ENDED INPUT NETWORK 24Ω 100nF EXT ESD R1 1.3kΩ 430Ω 100nF AIN2 NEGATIVE INPUT CONNECTOR Figure 10. Differential Input Network Fully differential video transmission involves transmitting two complementary CVBS signals. Pseudo differential video transmission involves transmitting a CVBS signal and a source ground signal. Differential video transmission has several key advantages over single-ended transmission, including the following: AIN3 51Ω 11935-008 EXT ESD VIDEO INPUT FROM SOURCE 11935-009 • Single-ended CVBS • YC (S-Video) • YPrPb It is recommended that the input network circuit shown in Figure 9 be placed as close as possible to the AINx pins of the ADV728x. VIDEO INPUT FROM SOURCE AIN1 430Ω Figure 9 shows the input network to use on each AINx input pin of the ADV728x when any of the following video input formats are used: INPUT CONNECTOR 100nF Figure 9. Single-Ended Input Network The 24 Ω and 51 Ω resistors supply the 75 Ω end termination required for the analog video input. These resistors also create a resistor divider with a gain of 0.68. The resistor divider attenuates the amplitude of the input analog video and scales the input to the ADC range of the ADV728x. This allows an input range to the ADV728x of up to 1.47 V peak-to-peak. Note that amplifiers within the ADC restore the amplitude of the input signal so that signal-to-noise ratio (SNR) performance is maintained. The 100 nF ac coupling capacitor removes the dc bias of the analog input video before it is fed into the AINx pin of the ADV728x. The clamping circuitry within the ADV728x restores the dc bias of the input signal to the optimal level before it is fed into the ADC of the ADV728x. The 100 nF ac coupling capacitor limits the current flow into the ADV728x during short-to-battery (STB) events. Note that the 24 Ω and 51 Ω resistors can be damaged during STB events unless high power resistors are used. To avoid the need for high power resistors, use the differential input network described in the Differential Input Network section. DIFFERENTIAL INPUT NETWORK • • • Inherent small signal and large signal noise rejection Improved EMI performance Ability to absorb ground bounce Resistor R1 provides the RF end termination for the differential CVBS input lines. For a pseudo differential CVBS input, R1 should have a value of 75 Ω. For a fully differential CVBS input, R1 should have a value of 150 Ω. The 1.3 kΩ and 430 Ω resistors create a resistor divider with a gain of 0.25. The resistor divider attenuates the amplitude of the input analog video, but increases the input common-mode range to 4 V peak-to-peak. Note that amplifiers within the ADC restore the amplitude of the input signal so that SNR performance is maintained. The 100 nF ac coupling capacitor removes the dc bias of the analog input video before it is fed into the AINx pin. The clamping circuitry within the part restores the dc bias of the input signal to the optimal level before it is fed into the ADC of the part. The 100 nF ac coupling capacitors limit the current flow into the ADV7281, ADV7281-M, ADV7281-MA, ADV7282, ADV7282-M, and ADV7283 during STB events. See the Shortto-Battery Protection section. To achieve optimal performance, the 1.3 kΩ and 430 Ω resistors should be closely matched; that is, all 1.3 kΩ and 430 Ω resistors should have the same resistance tolerance, and this tolerance should be as low as possible. This section applies to the ADV7281, ADV7281-M, ADV7281-MA, ADV7282, ADV7282-M, and ADV7283 models only. Figure 10 shows the input network to use when pseudo differential or fully differential CVBS video is input on the AINx input pins. It is recommended that the input network circuit shown in Figure 10 be placed as close as possible to the AINx pins of the ADV728x. Rev. A | Page 12 of 104 ADV7280/ADV7281/ADV7282/ADV7283 Hardware Reference Manual SHORT-TO-BATTERY PROTECTION In differential mode, the ADV7281, ADV7281-M, ADV7281-MA, ADV7282, ADV7282-M, and ADV7283 are protected against short-to-battery (STB) events by the external 100 nF ac-coupling capacitors (see Figure 10). The external input network resistors are sized to be large enough to reduce the current flow during a STB event, but to be small enough not to effect the operation of the ADV7281, ADV7281-M, ADV7281-MA, ADV7282, ADV7282-M, and ADV7283. UG-637 Choose the power rating of the input network resistors to withstand the high voltages of STB events. Similarly, choose the breakdown voltage of the ac-coupling capacitors to be robust to STB events. The R1 resistor is protected because no current or limited current flows through it during an STB event. In single-ended CVBS, YC, and YPbPr modes, the inputs network resistors need to have high power ratings to be robust to STB events Rev. A | Page 13 of 104 UG-637 ADV7280/ADV7281/ADV7282/ADV7283 Hardware Reference Manual SHORT-TO-BATTERY (STB) DIAGNOSTICS Short-to-battery (STB) diagnostic pins are only available on the ADV7281, ADV7281-M, ADV7282, and ADV7282-M models. R5 DIAG1 INPUT CONNECTOR R4 1.3kΩ 100nF Resistors R4 and R5 divide down the voltage at the input connector to protect the DIAGx pin from an STB event. The DIAGx pin circuitry compares this voltage to a programmable reference voltage, known as the diagnostic slice level. When the diagnostic slice level is exceeded, an STB event has occurred. AIN1 430Ω EXT ESD R1 1.3kΩ 430Ω 100nF INPUT CONNECTOR Figure 11. Diagnostic Connections AIN2 11935-010 VIDEO INPUT FROM SOURCE The ADV7281/ADV7281-M/ADV7282/ADV7282-M senses an STB event via the DIAG1 and DIAG2 pins. The DIAG1 and DIAG2 pins can sense an STB event on either the positive or negative differential input because of the negligible voltage drop across Resistor R1. When the DIAGx pin voltage exceeds the diagnostic slice level voltage, a hardware interrupt is triggered and indicated by the INTRQ pin. A readback register is also provided, which allows the user to determine the DIAGx pin on which the STB event occurred (see the Programming Diagnostic Interrupt section for more information). Use Equation 1 to find the trigger voltage for a selected diagnostic slice level. VSTB _ TRIGGER  R5  R4  DIAGNOSTIC _SLICE_LEV EL R5 where: VSTB_TRIGGER is the minimum voltage required at the input connector to trigger the STB interrupt on the ADV7281/ADV7281-M/ADV7282/ADV7282-M. DIAGNOSTIC_SLICE_LEVEL is the programmable reference voltage. Rev. A | Page 14 of 104 (1) ADV7280/ADV7281/ADV7282/ADV7283 Hardware Reference Manual DIAG2 Pin DIAG2_SLICER_PWRDN, User Sub Map, Address 0x5E[6] PROGRAMMING DIAGNOSTIC SLICE LEVELS DIAG1 Pin DIAG1_SLICER_PWRDN, User Sub Map, Address 0x5D[6] This bit powers up or powers down the diagnostic circuitry for the DIAG1 pin. Table 8. DIAG1_SLICER_PWRDN Function DIAG1_SLICER_PWRDN 0 1 (default) Diagnostic Slice Level Power up the diagnostic circuitry for the DIAG1 pin. Power down the diagnostic circuitry for the DIAG1 pin. DIAG1_SLICE_LEVEL[2:0], User Sub Map, Address 0x5D[4:2] The DIAG1_SLICE_LEVEL[2:0] bits allow the user to set the diagnostic slice level for the DIAG1 pin. When a voltage greater than the diagnostic slice level is seen on the DIAG1 pin, an STB interrupt is triggered. For the diagnostic slice level to be set correctly, the diagnostic circuitry for the DIAG1 pin must be powered up (see Table 8). Table 9. DIAG1_SLICE_LEVEL[2:0] Settings DIAG1_SLICE_LEVEL[2:0] 000 001 010 011 (default) 100 101 110 111 1 Diagnostic Slice Level 75 mV1 225 mV1 375 mV1 525 mV 675 mV 825 mV 975 mV 1.125 V UG-637 This bit powers up or powers down the diagnostic circuitry for the DIAG2 pin. Table 10. DIAG2_SLICER_PWRDN Function DIAG2_SLICER_PWRDN 0 1 (default) Diagnostic Slice Level Power up the diagnostic circuitry for the DIAG2 pin. Power down the diagnostic circuitry for the DIAG2 pin. DIAG2_SLICE_LEVEL[2:0], User Sub Map, Address 0x5E[4:2] The DIAG2_SLICE_LEVEL[2:0] bits allow the user to set the diagnostic slice level for the DIAG2 pin. When a voltage greater than the diagnostic slice level is seen on the DIAG2 pin, an STB interrupt is triggered. For the diagnostic slice level to be set correctly, the diagnostic circuitry for the DIAG2 pin must be powered up (see Table 10). Table 11. DIAG2_SLICE_LEVEL[2:0] Settings DIAG2_SLICE_LEVEL[2:0] 000 001 010 011 (default) 100 101 110 111 1 Diagnostic Slice Level 75 mV1 225 mV1 375 mV1 525 mV 675 mV 825 mV 975 mV 1.125 V This setting is not recommended for the optimal performance of the ADV728x. This setting is not recommended for the optimal performance of the ADV728x. Rev. A | Page 15 of 104 UG-637 ADV7280/ADV7281/ADV7282/ADV7283 Hardware Reference Manual PROGRAMMING DIAGNOSTIC INTERRUPT This section describes how to program software interrupt bits to toggle when STB events are detected on the diagnostic pins. A hardware interrupt indicated by the INTRQ pin will also trigger when a software interrupt activates. Details on how to control the INTRQ pin hardware interrupt are given in the Programming INTRQ Hardwar Interrupt section. Before programming the software diagnostic interrupts, the diagnostic circuitry must first be activated and the diagnostic slice level must be programmed (see Programming Diagnostic Slice Levels section). The diagnostic interrupts also need to be unmasked (that is, activated) using the DIAG_TRI1_L1_MSK and DIAG_TRI2_L1_MSK bits. DIAG_TRI1_L1, Diagnostic Interrupt 1 Status, Interrupt/VDP Sub Map, Address 0x53[1] This read-only register, shows the status of the interrupt for Diagnostic Pin 1, that is, if a STB event has occurred on the DIAG1 pin. An STB event is deemed to have occurred when the voltage on the DIAG1 pin exceeds the diagnostic slice level (see the Programming Diagnostic Slice Levels section). When triggered the DIAG_TRI1_L1 bit will remain high until cleared (see the Clearing Diagnostic Interrupts). Table 14. DIAG_TRI1_L1 DIAG_TRI1_L1 0 1 Description Voltage higher than DIAG1_Slice_Level not detected on DIAG1 pin Voltage higher than DIAG1_Slice_Level detected on DIAG1 pin When a STB event is detected, the interrupt status bits DIAG_TRI1_L1 and DIAG_TRI2_L1 will toggle from 0 to 1. DIAG_TRI2_L1, Diagnostic Interrupt 2 Status, Interrupt/VDP Sub Map, Address 0x53[3] The DIAG_TRI1_L1 and DIAG_TRI2_L1 interrupts will remain at 1 until they are cleared. This read-only register, shows the status of the interrupt for Diagnostic Pin 2, that is, if a STB event has occurred on the DIAG2 pin. An STB event is deemed to have occurred when the voltage on the DIAG2 pin exceeds the diagnostic slice level (see the Programming Diagnostic Slice Levels section). When triggered the DIAG_TRI2_L1 bit will remain high until cleared (see the Clearing Diagnostic Interrupts). DIAG_TRI1_L1 and DIAG_TRI2_L1 interrupts are cleared by writing 1 to the DIAG_TRI1_L1_CLR and DIAG_TRI2_L1_CLR bits. Unmasking Diagnostic Interrupts The DIAG_TRI1_L1_MSK and DIAG_TRI2_L1_MSK bits are used to unmask (that is, to activate) the diagnostic interrupts. Table 15. DIAG_TRI2_L1 Function DIAG_TRI2_L1 0 DIAG_TRI1_L1_MSK, Unmask Diagnostic Interrupt 1, Interrupt/VDP Sub Map, Address 0x55[1] Description Voltage higher than DIAG2_SLICE_LEVEL not detected on the DIAG2 pin Voltage higher than DIAG2_SLICE_LEVEL detected on the DIAG2 pin This unmasks (that is, activates) the STB interrupt for Diagnostic Pin 1. 1 Table 12. DIAG_TRI1_L1_MSK Function Clearing Diagnostic Interrupts DIAG_TRI1_L1_MSK Description 0 (default) 1 Mask DIAG_TRI1_L1 interrupt Unmask DIAG_TRI1_L1 interrupt The DIAG_TRI1_L1_CLR and DIAG_TRI2_L1_CLR bits are used to clear the diagnostic interrupts. DIAG_TRI1_L1_CLR, Clear Diagnostic Interrupt 1, Interrupt/VDP Sub Map, Address 0x54[1] DIAG_TRI2_L1_MSK, Unmask Diagnostic Interrupt 2, Interrupt/VDP Sub Map, Address 0x55[3] This bit clears the interrupt for Diagnostic Pin 1. This unmasks (that is, activates) the STB interrupt for Diagnostic Pin 2. The DIAG_TRI1_L1_CLR is a self-clearing, write only bit. Table 16. DIAG_TRI1_L1_CLR Function Table 13. DIAG_TRI2_L1_MSK Function DIAG_TRI2_L1_MSK Description 0 (default) 1 Mask DIAG_TRI2_L1 interrupt Unmask (that is, activate) DIAG_TRI2_L1 interrupt Diagnostic Interrupt Status The DIAG_TRI1_L1 and DIAG_TRI2_L1 bits give the status of the diagnostic interrupt (that is, if a STB event has occurred or not). DIAG_TRI1_L1_CLR 0 (default) 1 Description Do not clear DIAG_TRI1_L1 Clear DIAG_TRI1_L1 DIAG_TRI2_L1_CLR , Clear Diagnostic Interrupt 2, Interrupt/VDP Sub Map, Address 0x54[3] This bit clears the interrupt for Diagnostic Pin 2. The DIAG_TRI2_L1_CLR is a self-clearing, write only bit. Table 17. DIAG_TRI2_L1_CLR Function DIAG_TRI2_L1_CLR 0 (default) 1 Rev. A | Page 16 of 104 Description Do not clear DIAG_TRI2_L1 Clear DIAG_TRI2_L1 ADV7280/ADV7281/ADV7282/ADV7283 Hardware Reference Manual PROGRAMMING INTRQ HARDWARE INTERRUPT When a software interrupt is unmasked and triggered, a hardware interrupt indicated by the INTRQ pin will also automatically trigger. INTRQ_DUR_SEL[1:0], Interrupt/VDP Sub Map, Address 0x40[7:6] The INTRQ_DUR_SEL[1:0] bits are used to set the duration of the INTRQ interrupt output. An example on how to program a software interrupt is given in the Programming Diagnostic Interrupt section. Other software interrupts can be programmed in a similar manner. See Table 106 for other software interrupts available on the ADV728x. The INTRQ_OP_SEL[1:0] bits are used to program the INTRQ hardware interrupt to drive out in a number of different ways (for example, drive the INTRQ pin high, drive the INTRQ pin low, or make the INTRQ pin open drain). The INTRQ_DUR_SEL[1:0] bits are used to set the duration of the INTRQ interrupt output. The duration of the INTRQ interrupt output is given in terms of crystal clock periods. Because a 28.63636 MHz crystal is used a clock period corresponds to approximately 35 ns. The INTRQ interrupt output can also be set to be active until cleared. In this mode of operation, the INTRQ pin will be active until every active software interrupt has been cleared. Table 19. INTRQ_DUR_SEL[1:0] Settings INTRQ_DUR_SEL[1:0] 00 (default) 01 INTRQ_OP_SEL[1:0], Interrupt/VDP Sub Map, Address 0x40[1:0] 10 The INTRQ_OP_SEL[1:0] bits are used to program the INTRQ hardware interrupt to drive out in a number of different ways when active. 11 In open-drain mode, the INTRQ is at DVDDIO voltage when not active and drives low when active. In open-drain mode, the INTRQ pin requires a pull-up resistor to DVDDIO in order for the INTRQ interrupt to work correctly. In drive low when active mode, the INTRQ is at DVDDIO voltage when not active and drives low when active. In drive low when active mode, the INTRQ pin does not require a pullup resistor to DVDDIO. In drive high when active mode, the INTRQ is at GND when not active and drives high to DVDDIO when active. In drive high when active mode, the INTRQ pin does not require a pullup resistor to DVDDIO. Table 18. INTRQ_OP_SEL[1:0] Settings INTRQ_OP_SEL[1:0] 00 (default) 01 10 11 UG-637 Description Open drain Drive low when active Drive high when active Reserved Rev. A | Page 17 of 104 Description 3 crystal periods ( approximately 0.105 µs) 15 crystal periods (approximately 0.525 µs) 63 crystal periods (approximately 2.205 µs) Active until cleared UG-637 ADV7280/ADV7281/ADV7282/ADV7283 Hardware Reference Manual ANALOG FRONT END INPUT CONFIGURATION INSEL[4:0], Input Control, Address 0x00[4:0] The following two steps are key for configuring the ADV728x to correctly decode the input video. The INSEL bits allow the user to select the input format. They also configure the standard definition processor core to process CVBS, differential CVBS, S-Video (Y/C), or component (YPrPb) format. 1. 2. Use INSEL[4:0] to configure the routing and format decoding (CVBS, Y/C, or YPrPb). If the input requirements are not met using the INSEL[4:0] options, the analog input muxing section must be configured manually to correctly route the video from the analog input pins to the ADC. The standard definition processor block, which decodes the digital data, should be configured to process the CVBS, Y/C, or YPrPb format. This is performed by the INSEL[4:0] selection. INSEL[4:0] has predefined analog input routing schemes that do not require manual mux programming (see Table 20). This allows the user to route the various video signal types to the decoder and select them using INSEL[4:0] only. The added benefit is that if, for example, the CVBS input is selected, the remaining channels are powered down. Rev. A | Page 18 of 104 ADV7280/ADV7281/ADV7282/ADV7283 Hardware Reference Manual UG-637 Table 20. INSEL[4:0] Analog Input for ADV7281 and ADV7282 CVBS input on AIN1 CVBS input on AIN2 Reserved Reserved Reserved Reserved CVBS input on AIN3 CVBS input on AIN4 Y input on AIN1, C input on AIN2 Reserved Analog Input for ADV7281-M, ADV7282-M, and ADV7283 CVBS input on AIN1 CVBS input on AIN2 CVBS input on AIN3 CVBS input on AIN4 Reserved Reserved CVBS input on AIN5 CVBS input on AIN6 Y input on AIN1, C input on AIN2 Y input on AIN3, C input on AIN4 Reserved INSEL [4:0] 00000 00001 00010 00011 00100 00101 00110 00111 01000 Video Format CVBS CVBS CVBS CVBS CVBS CVBS CVBS CVBS Y/C (S-Video) 01001 Y/C (S-Video) 01010 Y/C (S-Video) Analog Input for ADV7280 CVBS input on AIN1 CVBS input on AIN2 CVBS input on AIN3 CVBS input on AIN4 Reserved Reserved Reserved Reserved Y input on AIN1, C input on AIN2 Y input on AIN3, C input on AIN4 Reserved 01011 Y/C (S-Video) Reserved 01100 YPrPb 01101 YPrPb Y input on AIN1, Pb input on AIN2, Pr input on AIN3 Reserved 01110 Differential CVBS Differential CVBS Differential CVBS Differential CVBS Reserved Analog Input for ADV7280-M CVBS input on AIN1 CVBS input on AIN2 CVBS input on AIN3 CVBS input on AIN4 CVBS input on AIN5 CVBS input on AIN6 CVBS input on AIN7 CVBS input on AIN8 Y input on AIN1, C input on AIN2 Y input on AIN3, C input on AIN4 Y input on AIN5, C input on AIN6 Y input on AIN7, C input on AIN8 Y input on AIN1, Pb input on AIN2, Pr input on AIN3 Y input on AIN4, Pb input on AIN5, Pr input on AIN6 Reserved Reserved Reserved Positive on AIN1, Negative on AIN2 Reserved Reserved Reserved Reserved Positive on AIN1, Negative on AIN2 Positive on AIN3, Negative on AIN4 Reserved Reserved Reserved Reserved Reserved Reserved Positive on AIN3, Negative on AIN4 Reserved Positive on AIN5, Negative on AIN6 Reserved 01111 10000 10001 10010 to 11111 1 Reserved Y input on AIN3, C input on AIN4 Reserved1 Reserved1 Y input on AIN5, C input on AIN6 Y input on AIN1, Pb input on AIN2, Pr input on AIN3 Reserved Analog Input for ADV7281-MA CVBS input on AIN1 CVBS input on AIN2 CVBS input on AIN3 CVBS input on AIN4 CVBS input on AIN5 CVBS input on AIN6 CVBS input on AIN7 CVBS input on AIN8 Y input on AIN1, C input on AIN2 Y input on AIN3, C input on AIN4 Y input on AIN5, C input on AIN6 Y input on AIN7, C input on AIN8 Y input on AIN1, Pb input on AIN2, Pr input on AIN3 Y input on AIN4, Pb input on AIN5, Pr input on AIN6 Positive on AIN1, Negative on AIN2 Positive on AIN3, Negative on AIN4 Positive on AIN5, Negative on AIN6 Positive on AIN7, Negative on AIN8 Reserved Note that it is possible for the ADV7281/ADV7282 to receive YPbPr formats; however, a manual muxing scheme is required. In this case luma(Y) is fed in on AIN1 or AIN3, blue chroma (Pb) is fed in on AIN4 and red chroma (Pr) is fed in on AIN2. See the Manual Muxing Mode section for more information. Rev. A | Page 19 of 104 UG-637 ADV7280/ADV7281/ADV7282/ADV7283 Hardware Reference Manual MAN_MUX_EN MAN_MUX_EN AIN1 AIN2 AIN3 AIN4 AIN1 AIN2 AIN3 AIN4 AIN5 AIN6 MUX_0[3:0] AIN2 AIN4 AIN6 AIN2 AIN4 MUX_0[3:0] MUX_0N[3:0] MUX_1[3:0] ADC ADC AIN2 AIN4 AIN6 MUX_1[3:0] AIN2 AIN3 MUX_2[3:0] MUX_2[3:0] 11935-011 AIN2 AIN3 11935-014 Figure 12. Manual Muxing Scheme for ADV7280 MAN_MUX_EN AIN2 AIN3 AIN6 MAN_MUX_EN MUX_0[3:0] AIN1 AIN2 AIN3 AIN4 AIN5 AIN6 AIN7 AIN8 MUX_1[3:0] ADC AIN2 AIN4 AIN6 AIN8 MUX_2[3:0] MUX_0[3:0] MUX_0N[3:0] Figure 13. Manual Muxing Scheme for ADV7280-M MAN_MUX_EN AIN1 AIN2 AIN3 AIN4 AIN2 AIN4 AIN2 AIN4 MUX_0[3:0] ADC AIN2 AIN4 AIN5 AIN6 AIN8 MUX_1[3:0] AIN2 AIN3 AIN6 MUX_2[3:0] Figure 16. Manual Muxing Scheme for ADV7281-MA MUX_ON[3:0] ADC MUX_1[3:0] AIN2 11935-013 MUX_2[3:0] Figure 14. Manual Muxing Scheme for ADV7281 and ADV7282 Rev. A | Page 20 of 104 11935-015 AIN2 AIN4 AIN5 AIN6 AIN8 Figure 15. Manual Muxing Scheme for ADV7281-M, ADV7282-M, and ADV7283 11935-012 AIN1 AIN2 AIN3 AIN4 AIN5 AIN6 AIN7 AIN8 ADV7280/ADV7281/ADV7282/ADV7283 Hardware Reference Manual MANUAL MUXING MODE UG-637 Note that MUX0N cannot be powered down independently. MUX0N can only be powered down when MUX0, MUX1, and MUX2 are all powered down. In manual muxing mode, the user selects the analog input pin (for example, AIN1, AIN2, and so on) that is to be processed by the ADC of the ADV728x. MAN_MUX_EN (User Map, Register 0xC4, Bit 7) must be set to 1 to enable the following muxing blocks: Manual Muxing of the ADV7280    MAN_MUX_EN must be set to 1 (User Map, Register 0xC4, Bit 7).  CVBS can only be processed by MUX0.  Y/C can only be processed by MUX0 and MUX1. MUX0 processes the luma (Y) and MUX1 processes the chroma (C).  Component (YPbPr) signals can only be processed by MUX0(Y), MUX1(Pb), and MUX2(Pr).   MUX0[3:0], ADC mux configuration, Address 0xC3[3:0] MUX0N[3:0], ADC mux configuration, Address 0x60[3:0] (MUX0N[3:0] applies only to the ADV7281, ADV7281-M, ADV7281-MA, ADV7282, and ADV7282-M models) MUX1[3:0], ADC mux configuration, Address 0xC3[7:4] MUX2[3:0], ADC mux configuration, Address 0xC4[3:0] The four mux sections are controlled by the signal buses, MUX0/MUX0N/MUX2/MUX3[2:0]. The tables in this section explain the control words used. The input signal that contains the timing information (HS and VS) must be processed by MUX0. For example, in a Y/C input configuration, connect MUX0 to the Y channel and MUX1 to the C channel. MUX0N is only used to process the negative input for fully differential or pseudo differential CVBS inputs. When one or more muxes are not used to process video, such as the CVBS input, the idle mux and associated channel clamps and buffers should be powered down (see the description of Register 0x3A in the User Map in Table 104). Table 21 shows the settings for manual muxing of the ADV7280. Manual Muxing of the ADV7280-M Table 22 shows the settings for manual muxing of the ADV7280-M.    MAN_MUX_EN must be set to 1 (User Map, Register 0xC4, Bit 7). CVBS can only be processed by MUX0. Y/C can only be processed by MUX0 and MUX1. MUX0 processes the luma (Y) and MUX1 processes the chroma (C). Component (YPbPr) signals can only be processed by MUX0(Y), MUX1(Pb), and MUX2(Pr). Table 21. Manual Mux Settings for ADC of ADV7280 MUX0[3:0] 0000 0001 0010 0011 0100 0101 to 1111 ADC Connection No connect AIN1 AIN2 AIN3 AIN4 No connect MUX1[3:0] 0000 0001 0010 0011 0100 0101 to 1111 ADC Connected To No connect No connect AIN2 No connect AIN4 No connect MUX2[3:0] 0000 0001 0010 0011 0100 0101 to 1111 ADC Connection No connect No connect AIN2 AIN3 No connect No connect ADC Connection No connect No connect AIN2 No connect AIN4 AIN5 AIN6 No connect AIN8 No connect MUX2[3:0] 0000 0001 0010 0011 0100 0101 0110 0111 1000 1001-1111 ADC Connection No connect No connect AIN2 AIN3 No connect No connect AIN6 No connect No connect No connect Table 22. Manual Mux Settings for ADC of ADV7280-M MUX0[3:0] 0000 0001 0010 0011 0100 0101 0110 0111 1000 1001-1111 ADC Connection No connect AIN1 AIN2 AIN3 AIN4 AIN5 AIN6 AIN7 AIN8 No connect MUX1[3:0] 0000 0001 0010 0011 0100 0101 0110 0111 1000 1001-1111 Rev. A | Page 21 of 104 ADV7280/ADV7281/ADV7282/ADV7283 Hardware Reference Manual Manual Muxing of the ADV7281 and ADV7282 • Table 24 shows the settings for manual muxing of the ADV7281 and ADV7282. • • • • MAN_MUX_EN must be set to 1 (User Map, Register 0xC4, Bit 7) CVBS can only be processed by MUX0. Differential CVBS can only be processed by MUX0 (positive channel) and MUX0N (negative channel). UG-637 Y/C can only be processed by MUX0 and MUX1. MUX0 processes the luma (Y) and MUX1 processes the chroma (C). Component (YPbPr) signals can only be processed by MUX0(Y), MUX1(Pb), and MUX2(Pr). For example, Y can be fed in on AIN1 or AIN3 for MUX0. Pb can be fed in on AIN4 for MUX1. Pr can be fed in on AIN2 for MUX2. Table 23 gives an example of how to program the ADV7281/ADV7282 to accept YPrPb inputs. Table 23. Register Writes to Program the ADV7281 or ADV7282 to Accept YPbPr Input Register Map User Map (0x40 or 0x42) Register Address 0x00 0xC3 Register Write 0x0C 0x87 0xC4 0x82 Description Program INSEL for YPbPr input. Program manual muxing. Y is fed in on AIN3 for MUX0. Pb is fed in on AIN4 for MUX1. Enable manual muxing. Pr is fed in on AIN2 for MUX2. Table 24. Manual Mux Settings for ADC of ADV7281 and ADV7282 MUX0[3:0] 0000 0001 0010 0011 0100 0101 0110 0111 1000 1001 to 1111 ADC Connection No connect AIN1 AIN2 No connect No connect No connect No connect AIN3 AIN4 No connect MUX0N[3:0] 0000 0001 0010 0011 0100 0101 0110 0111 1000 1001 to 1111 ADC Connection No connect No connect AIN2 No connect No connect No connect No connect No connect AIN4 No connect MUX1[3:0] 0000 0001 0010 0011 0100 0101 0110 0111 1000 1001 to 1111 Rev. A | Page 22 of 104 ADC Connection No connect No connect AIN2 No connect No connect No connect No connect No connect AIN4 No connect MUX2[3:0] 0000 0001 0010 0011 0100 0101 0110 0111 1000 1001 to 1111 ADC Connection No connect No connect AIN2 No connect No connect No connect No connect No connect No connect No connect ADV7280/ADV7281/ADV7282/ADV7283 Hardware Reference Manual UG-637 Manual Muxing of the ADV7281-M, ADV7282-M, and ADV7283 Table 25 shows the settings for manual muxing of the ADV7281-M, ADV7282-M, and ADV7283. • • • • • MAN_MUX_EN must be set to 1 (User Map, Register 0xC4, Bit 7) CVBS can only be processed by MUX0. Differential CVBS can only be processed by MUX0 (positive channel) and MUX0N (negative channel). Y/C can only be processed by MUX0 and MUX1. MUX0 processes the luma (Y) and MUX1 processes the chroma (C). Component (YPbPr) signals can only be processed by MUX0(Y), MUX1(Pb), and MUX2(Pr). Table 25. Manual Mux Settings for ADC of ADV7281-M, ADV7282-M, and ADV7283 MUX0[3:0] 0000 0001 0010 0011 0100 0101 0110 0111 1000 1001 to 1111 ADC Connection No connect AIN1 AIN2 AIN3 AIN4 No connect No connect AIN5 AIN6 No connect MUX0N[3:0] 0000 0001 0010 0011 0100 0101 0110 0111 1000 1001 to 1111 ADC Connection No connect No connect AIN2 No connect AIN4 No connect No connect No connect AIN6 No connect MUX1[3:0] 0000 0001 0010 0011 0100 0101 0110 0111 1000 1001 to 1111 Rev. A | Page 23 of 104 ADC Connection No connect No connect AIN2 No connect AIN4 No connect No connect No connect AIN6 No connect MUX2[3:0] 0000 0001 0010 0011 0100 0101 0110 0111 1000 1001 to 1111 ADC Connection No connect No connect AIN2 AIN3 No connect No connect No connect No connect No connect No connect UG-637 ADV7280/ADV7281/ADV7282/ADV7283 Hardware Reference Manual Manual Muxing of the ADV7281-MA Table 26 shows the settings for manual muxing of the ADV7281-MA. • • • • • MAN_MUX_EN must be set to 1 (User Map, Register 0xC4, Bit 7). CVBS can only be processed by MUX0. Differential CVBS can only be processed by MUX0 (positive channel) and MUX0N (negative channel). Y/C can only be processed by MUX0 and MUX1. MUX0 processes the luma (Y) and MUX1 processes the chroma (C). Component (YPbPr) signals can only be processed by MUX0(Y), MUX1(Pb), and MUX2(Pr). Table 26. Manual Mux Settings for ADC of ADV7281-MA MUX0[3:0] 0000 0001 0010 0011 0100 0101 0110 0111 1000 1001 to 1111 ADC Connection No connect AIN1 AIN2 AIN3 AIN4 AIN5 AIN6 AIN7 AIN8 No connect MUX0N[3:0] 0000 0001 0010 0011 0100 0101 0110 0111 1000 1001 to 1111 ADC Connection No connect No connect AIN2 No connect AIN4 No connect AIN6 No connect AIN8 No connect MUX1[3:0] 0000 0001 0010 0011 0100 0101 0110 0111 1000 1001 to 1111 Rev. A | Page 24 of 104 ADC Connection No connect No connect AIN2 No connect AIN4 AIN5 AIN6 No connect AIN8 No connect MUX2[3:0] 0000 0001 0010 0011 0100 0101 0110 0111 1000 1001 to 1111 ADC Connection No connect No connect AIN2 AIN3 No connect No connect AIN6 No connect No connect No connect ADV7280/ADV7281/ADV7282/ADV7283 Hardware Reference Manual UG-637 ANTIALIASING FILTERS The ADV728x has optional on-chip antialiasing (AA) filters on each of the four channels that are multiplexed to the ADC (see Figure 17). AA_FILT_EN[1], Antialiasing Filter Enable, Address 0xF3[1] The filters are designed for standard definition video up to 10 MHz bandwidth. Figure 18 and Figure 19 show the filter magnitude and phase characteristics. When AA_FILT_EN[1] is set to 1, AA Filter 2 is enabled. AA_FILT_EN[2], Antialiasing Filter Enable, Address 0xF3[2] The antialiasing filters are enabled by default and the selection of INSEL[4:0] determines which filters are powered up at any given time. For example, if CVBS mode is selected, the filter circuits for the remaining input channels are powered down to conserve power. However, the antialiasing filters can be disabled or bypassed using the AA_FILT_MAN_OVR control. AA FILTER 1 MUX BLOCK AA FILTER 2 AA FILTER 3 When AA_FILT_EN[2] is set to 0, AA Filter 3 is disabled. When AA_FILT_EN[2] is set to 1, AA Filter 3 is enabled. AA_FILT_EN[3], Antialiasing Filter Enable, Address 0xF3[3] When AA_FILT_EN[3] is set to 0, AA Filter 4 is disabled. When AA_FILT_EN[3] is set to 1, AA Filter 4 is enabled. 10-BIT, 86MHz ADC 0 + SHA – –4 ADC –8 NOTES 1. EIGHT ANALOG INPUTS ARE ONLY AVAILABLE ON THE ADV7280-M AND ADV7281-MA MODELS. SIX ANALOG INPUTS ARE AVAILABLE ON ADV7281-M, ADV7282-M, AND ADV7283. FOUR ANALOG INPUTS ARE AVAILABLE ON ADV7280, ADV7281, AND ADV7282. MAGNITUDE (dB) AA FILTER 4 11935-016 AIN1 AIN2 AIN3 AIN4 AIN5 AIN6 AIN7 AIN8 When AA_FILT_EN[1] is set to 0, AA Filter 2 is disabled. –12 –16 –20 –24 –28 Figure 17. Antialias Filter Configuration –36 1k AA_FILT_MAN_OVR, Antialiasing Filter Override, Address 0xF3[4] 100k 1M 10M 100M FREQUENCY (Hz) Figure 18. Antialiasing Filter Magnitude Response This feature allows the user to override the antialiasing filters on/off settings, which are automatically selected by INSEL[4:0]. 0 –10 AA_FILT_EN[3:0], Antialiasing Filter Enable, Address 0xF3[3:0] –20 –30 –40 PHASE (Degrees) These bits allow the user to enable or disable the antialiasing filters on each of the three input channels multiplexed to the ADC. When disabled, the analog signal bypasses the AA filters and is routed directly to the ADC. –50 –60 –70 –80 –90 –100 –110 –120 When AA_FILT_EN[0] is set to 0, AA Filter 1 is disabled. –130 –140 When AA_FILT_EN[0] is set to 1, AA Filter 1 is enabled. –150 1k 10k 100k 1M 10M FREQUENCY (Hz) Figure 19. Antialiasing Filter Phase Response Rev. A | Page 25 of 104 100M 11935-018 AA_FILT_EN[0], Antialiasing Filter Enable, Address 0xF3[0] 10k 11935-017 –32 ANTIALIASING FILTER CONFIGURATION UG-637 ADV7280/ADV7281/ADV7282/ADV7283 Hardware Reference Manual GLOBAL CONTROL REGISTERS The register control bits listed in this section affect the entire chip. POWER SAVING MODE AND RESET CONTROL Power Down PWRDWN, Address 0x0F[5] The ADV728x can be placed into a chip-wide, power-down mode by setting the PWRDWN bit or by using the PWRDWN pin. The power-down mode stops the clock from entering the digital section of the chip, thereby freezing its operation. No I2C bits are lost during power-down mode. The PWRDWN bit also affects the analog blocks and switches them into low current modes. The I2C interface is unaffected and remains operational in power-down mode. When PWRDWN is set to 0, the chip is operational. When PWRDWN is set to 1 (default), the ADV728x is in a chip-wide, power-down mode. Reset, Chip Reset, Address 0x0F[7] Setting this bit, which is equivalent to controlling the RESET pin on the ADV728x, issues a full chip reset. All I2C registers are reset to their default/power-up values. Note that some register bits do not have a reset value specified; they keep their last written value. Those bits are marked as having a reset value of x in the register tables (see Table 104 and Table 106). After the reset sequence, the part immediately starts to acquire the incoming video signal. After setting the reset bit (or initiating a reset via the RESET pin), the part returns to the default for its primary mode of operation. All I2C bits are loaded with their default values, making this bit self-clearing. Executing a software reset takes approximately 2 ms. However, it is recommended to wait 5 ms before any further I2C writes are performed. The I2C master controller receives a no acknowledge condition on the ninth clock cycle when chip reset is implemented. When the reset bit is set to 0 (default), operation is normal. When the reset bit is set to 1, the reset sequence starts. GLOBAL PIN CONTROL Drive Strength Selection (I2C) DR_STR_S[1:0], Address 0xF4[1:0] The DR_STR_S[1:0] bits allow the user to select the strength of the I2C signal output drivers. This affects the drive strength for the SDA and SCL pins. Table 27. DR_STR_S Function DR_STR_S[1:0] 00 01 (default) 10 11 1 Description Low drive strength (1×)1 Medium low drive strength (2×) Medium high drive strength (3×) High drive strength (4×) The low drive strength setting is not recommended for the optimal performance of the ADV728x. Rev. A | Page 26 of 104 ADV7280/ADV7281/ADV7282/ADV7283 Hardware Reference Manual UG-637 GENERAL-PURPOSE OUTPUT CONTROLS When GPO[0] is set to 1, Logic 1 is output from the GPO0 pin. The ADV7280-M, ADV7281-M, ADV7281-MA, and ADV7282-M have three general-purpose outputs (GPO). GPO[1] When GPO[1] is set to 0 (default), Logic 0 is output from the GPO1 pin. Three GPOs These outputs allow the user to control other devices in a system via the I2C port of the device. When GPO[1] is set to 1, Logic 1 is output from the GPO1 pin. GPO[2] GPO_ENABLE, General-Purpose Output Enable, User Sub Map, Address 0x59[4] When GPO[2] is set to 0 (default), Logic 0 is output from the GPO2 pin. When GPO_ENABLE is set to 0 (default), all GPO pins are tristated. When GPO[2] is set to 1, Logic 1 is output from the GPO2 pin. When GPO_ENABLE is set to 1, all GPO pins are in a driven state. The polarity output from each GPO is controlled by GPO[3:0]. GPO[2:0], General-Purpose Outputs, User Sub Map, Address 0x59[2:0] Individual control of the four GPO ports is achieved using GPO[2:0]. GPO_ENABLE must be set to 1 for the GPO pins to become active. GPO[0] When GPO[0] is set to 0 (default), Logic 0 is output from the GPO0 pin. Table 28. General-Purpose Output Truth Table GPO_ENABLE 0 1 1 1 1 1 1 1 1 1 2 GPO[2:0] XXX1 000 001 010 011 100 101 110 111 X indicates any value. Z indicates high impedance. Rev. A | Page 27 of 104 GPO2 Z2 0 0 0 0 1 1 1 1 GPO1 Z2 0 0 1 1 0 0 1 1 GPO0 Z2 0 1 0 1 0 1 0 1 UG-637 ADV7280/ADV7281/ADV7282/ADV7283 Hardware Reference Manual GLOBAL STATUS REGISTER Four registers provide summary information about the video decoder. The IDENT register allows the user to identify the revision code of the ADV728x. The other three registers (Address 0x10, Address 0x12, and Address 0x13) contain status bits from the ADV728x. IDENTIFICATION IDENT[7:0], Address 0x11[7:0] This is the register identification of the ADV728x revision. Table 29 describes the various versions of the ADV728x. Table 29. IDENT CODE IDENT[7:0] 0x40 0x41 0x42 Description Pre-release Silicon Pre-release Silicon Released Silicon STATUS 2 Status 2[7:0], Address 0x12[7:0] Table 31. Status 2 Function Status 2[7:0] 0 Bit Name MVCS DET 1 MVCS T3 2 MV PS DET 3 4 5 6 7 MV AGC DET LL NSTD FSC NSTD Reserved Reserved Description Detected Rovi (previously Macrovision) color striping Rovi color striping protection; conforms to Type 3 if high, Type 2 if low Detected Rovi pseudo sync pulses Detected Rovi AGC pulses Line length is nonstandard fSC frequency is nonstandard STATUS 1 STATUS 3 Status 1[7:0], Address 0x10[7:0] Status 3[7:0], Address 0x13[7:0] Table 32. Status 3 Function This read-only register provides information about the internal status of the ADV728x. See the CIL[2:0], Count into Lock, Address 0x51[2:0] section and the COL[2:0], Count Out of Lock, Address 0x51[5:3] section for details on timing. Depending on the setting of the FSCLE bit, the status registers are based solely on horizontal timing information or on the horizontal timing and lock status of the color subcarrier. See the FSCLE, fSC Lock Enable, Address 0x51[7] section. Table 30. Status 1 Function Status 1[7:0] 0 1 2 3 4 5 6 7 Bit Name IN_LOCK LOST_LOCK FSC_LOCK FOLLOW_PW AD_RESULT[0] AD_RESULT[1] AD_RESULT[2] COL_KILL Description In lock (now) Lost lock (since last read) fSC locked (now) AGC follows peak white algorithm Result of autodetection Result of autodetection Result of autodetection Color kill active Status 3[7:0] 0 Bit Name INST_HLOCK 1 2 Reserved SD_OP_50Hz 3 4 Reserved FREE_RUN_ACT 5 STD FLD LEN 6 Interlaced 7 PAL_SW_LOCK Rev. A | Page 28 of 104 Description Horizontal lock indicator (instantaneous) Flags whether 50 Hz or 60 Hz is present at output Reserved Flags if ADV728x has entered free-run mode (see Free-Run Operation section) Field length is correct for currently selected video standard Interlaced video detected (field sequence found) Reliable sequence of swinging bursts detected ADV7280/ADV7281/ADV7282/ADV7283 Hardware Reference Manual UG-637 Table 33. AD_RESULT Function AUTODETECTION RESULT AD_RESULT[2:0], Address 0x10[6:4] The AD_RESULT[2:0] bits report back on the findings from the ADV728x autodetection block. See the General Setup section for more information on enabling the autodetection block and the Autodetection of SD Modes section for more information on how to configure it. AD_RESULT[2:0] 000 001 010 011 100 101 110 111 Rev. A | Page 29 of 104 Description NTSC M/NTSC J NTSC 4.43 PAL M PAL 60 PAL B/PAL G/PAL H/PAL I/PAL D SECAM PAL Combination N SECAM 525 UG-637 ADV7280/ADV7281/ADV7282/ADV7283 Hardware Reference Manual VIDEO PROCESSOR STANDARD DEFINITION PROCESSOR DIGITIZED CVBS DIGITIZED Y (YC) DIGITIZED CVBS DIGITIZED C (YC) VBI DATA RECOVERY LUMA DIGITAL FINE CLAMP CHROMA DIGITAL FINE CLAMP CHROMA DEMOD STANDARD AUTODETECTION SLLC CONTROL LUMA FILTER LUMA GAIN CONTROL LUMA RESAMPLE SYNC EXTRACT LINE LENGTH PREDICTOR RESAMPLE CONTROL CHROMA FILTER CHROMA GAIN CONTROL CHROMA RESAMPLE LUMA 2D COMB AV CODE INSERTION ACE DITHER I2P SD PROCESSOR OUTPUT MEASUREMENT BLOCK (≥ I2C) CHROMA 2D COMB VIDEO DATA PROCESSING BLOCK INTERLACED TO PROGRESSIVE CONVERTER BLOCK, ADV7280, ADV7280-M ADV7282 AND ADV7282-M ONLY fSC RECOVERY 11935-019 MACROVISION DETECTION Figure 20. Block Diagram of Video Processor Figure 20 shows a block diagram of the video processor within the ADV728x. The ADV728x can handle standard definition video in CVBS, Y/C, and YPrPb formats. It can be divided into a luminance and chrominance path. If the input video is of a composite type (CVBS), both processing paths are fed with the CVBS input. The output from the video processor is fed into a MIPI CSI-2 Tx block in the ADV728x-M models. In the ADV728x-T models, the output of the video processor is output from the part in an ITU-R BT.656 video stream.    SD LUMA PATH The input signal is processed by the following blocks:       Luma digital fine clamp. This block uses a high precision algorithm to clamp the video signal. Luma filter. This block contains a luma decimation filter (YAA) with a fixed response and some shaping filters (YSH) that have selectable responses. Luma gain control. The AGC can operate on a variety of different modes, including gain based on the depth of the horizontal sync pulse, peak white mode, and fixed manual gain. Luma resample. To correct for line length errors as well as dynamic line length changes, the data is digitally resampled. Luma 2D comb. The 2D comb filter provides Y/C separation. AV code insertion. At this point, the decoded luma (Y) signal is merged with the retrieved chroma values. AV codes can be inserted (as per ITU-R BT.656). SD CHROMA PATH    ACE, I2P, AND DITHER PROCESSING BLOCKS   The input signal is processed by the following blocks:  Chroma demodulation. This block employs a color subcarrier (fSC) recovery unit to regenerate the color subcarrier for any modulated chroma scheme. The demodulation block then performs an AM demodulation for PAL and NTSC, and an FM demodulation for SECAM. Chroma filter. This block contains a chroma decimation filter (CAA) with a fixed response and some shaping filters (CSH) that have selectable responses. Chroma gain control. AGC can operate on several different modes, including gain based on the color subcarrier amplitude, gain based on the depth of the horizontal sync pulse on the luma channel, or fixed manual gain. Chroma resample. The chroma data is digitally resampled to keep it perfectly aligned with the luma data. The resampling is done to correct for static and dynamic line length errors of the incoming video signal. Chroma 2D comb. The 2D, five line, super adaptive comb filter provides high quality Y/C separation if the input signal is CVBS. AV code insertion. At this point, the demodulated chroma (Cr and Cb) signal is merged with the retrieved luma values. AV codes can be inserted (as per ITU-R BT.656). Chroma digital fine clamp. This block uses a high precision algorithm to clamp the video signal. Rev. A | Page 30 of 104 Adaptive contrast enhancement (ACE). This block offers improved visual detail by using an algorithm to automatically vary the contrast levels to enhance picture detail. See the Adaptive Contrast Enhancement section. Dither. When enabled, this block converts the digital output of the ADV728x from 8-bit pixel data down to 6-bit pixel data. This function makes it easier for the ADV728x to communicate with some LCD panels. See the Dither Function section. ADV7280/ADV7281/ADV7282/ADV7283 Hardware Reference Manual • Interlaced-to-progressive converter (I2P). This block is only available in the ADV7280, ADV7280-M, ADV7282, ADV7282-M, and ADV7283 models. This block converts interlaced video formats (480i and 576i) into progressive video formats (480p and 576p). SYNC PROCESSING The ADV728x extracts syncs embedded in the analog input video signal. The sync extraction is optimized to support imperfect video sources, such as VCRs with head switches. The actual algorithm used employs a coarse detection based on a threshold crossing, followed by a more detailed detection using an adaptive interpolation algorithm. The raw sync information is sent to a line length measurement and prediction block. The output of this is then used to drive the digital resampling section to ensure that the ADV728x outputs 720 active pixels per line. The sync processing on the ADV728x also includes the following specialized postprocessing blocks that filter and condition the raw sync information retrieved from the digitized analog video: • • VSYNC processor. This block provides extra filtering of the detected VSYNCs to improve vertical lock. HSYNC processor. The HSYNC processor is designed to filter incoming HSYNCs that were corrupted by noise, providing much improved performance for video signals with a stable time base, but poor SNR. VBI DATA RECOVERY The ADV728x can retrieve the following information from the input video: • • • • • Wide screen signaling (WSS) Copy generation management system (CGMS) Closed captioning (CCAP) Rovi protection presence Teletext Autodetection of SD Modes To guide the autodetect system of the ADV728x, individual enable bits are provided for each of the supported video standards. Setting the relevant bit to 0 inhibits the standard from being detected automatically. Instead, the system chooses the closest of the remaining enabled standards. The results of the autodetection block can be read back via the status registers (see the Global Status Register section for more information). VID_SEL[3:0], Address 0x02[7:4] Table 34. VID_SEL Function VID_SEL[3:0] 0000 (default) 0001 0010 0011 0100 0101 0110 0111 1000 1001 1010 1011 1100 1101 1110 1111 Description Autodetect PAL B/PAL G/PAL H/PAL I/PAL D, NTSC J (no pedestal), SECAM Autodetect PAL B/PAL G/PAL H/PAL I/PAL D, NTSC M (pedestal), SECAM Autodetect PAL N (pedestal), NTSC J (no pedestal), SECAM Autodetect PAL N (pedestal), NTSC M (pedestal), SECAM NTSC J NTSC M PAL 60 NTSC 4.43 PAL B/PAL G/PAL H/PAL I/PAL D PAL N = PAL B/PAL G/PAL H/PAL I/PAL D (with pedestal) PAL M (without pedestal) PAL M PAL Combination N PAL Combination N (with pedestal) SECAM SECAM AD_SEC525_EN, SECAM 525 Autodetect Enable, Address 0x07[7] Setting AD_SEC525_EN to 0 (default) disables the autodetection of a 525-line system with a SECAM style, FM-modulated color component. The ADV728x is also capable of automatically detecting the incoming video standard with respect to the following: • • • UG-637 Setting AD_SEC525_EN to 1 enables the detection of a SECAM style, FM-modulated color component. Color subcarrier frequency Field rate Line rate The ADV728x can configure itself to support PAL B/PAL D/ PAL I/PAL G/PAL H, PAL M, PAL N, PAL Combination N, NTSC M/NTSC J, SECAM 50 Hz/60 Hz, NTSC 4.43, and PAL 60. GENERAL SETUP Video Standard Selection The VID_SEL[3:0] bits (Address 0x02[7:4]) allow the user to force the digital core into a specific video standard. This is not necessary under normal circumstances. The VID_SEL[3:0] bits default to an autodetection mode that supports PAL, NTSC, SECAM, and variants thereof. AD_SECAM_EN, SECAM Autodetect Enable, Address 0x07[6] Setting AD_SECAM_EN to 0 (default) disables the autodetection of SECAM. Setting AD_SECAM_EN to 1 enables the detection of SECAM. AD_N443_EN, NTSC 4.43 Autodetect Enable, Address 0x07[5] Setting AD_N443_EN to 0 disables the autodetection of NTSC style systems with a 4.43 MHz color subcarrier. Setting AD_N443_EN to 1 (default) enables the detection of NTSC style systems with a 4.43 MHz color subcarrier. Rev. A | Page 31 of 104 UG-637 ADV7280/ADV7281/ADV7282/ADV7283 Hardware Reference Manual AD_P60_EN, PAL 60 Autodetect Enable, Address 0x07[4] Setting AD_P60_EN to 0 disables the autodetection of PAL systems with a 60 Hz field rate. Setting AD_P60_EN to 1 (default) enables the detection of PAL systems with a 60 Hz field rate. AD_PALN_EN, PAL N Autodetect Enable, Address 0x07[3] Setting AD_PALN_EN to 0 (default) disables the detection of the PAL N standard. Setting AD_PALN_EN to 1 enables the detection of the PAL N standard. AD_PALM_EN, PAL M Autodetect Enable, Address 0x07[2] Setting AD_PALM_EN to 0 (default) disables the autodetection of PAL M. SFL_INV, Subcarrier Frequency Lock Inversion, Address 0x41[6] (ADV7280 Only) This bit controls the behavior of the PAL switch bit in the SFL (genlock telegram) data stream. Implemented to solve compatibility issues with video encoders, it solves two problems. First, the PAL switch bit is meaningful only in PAL. Some encoders (including Analog Devices encoders) also look at the state of this bit in NTSC. Second, there was a design change in Analog Devices encoders from ADV717x to ADV719x. The older versions used the SFL (genlock telegram) bit directly, whereas the newer ones invert the bit prior to using it. The reason for this is that the inversion compensated for the one line delay of an SFL (genlock telegram) transmission. AD_NTSC_EN, NTSC Autodetect Enable, Address 0x07[1] As a result, for the ADV717x and ADV73xx encoders, the PAL switch bit in the SFL (genlock telegram) must be set to 0 for NTSC to work. For the older video encoders, the PAL switch bit in the SFL must be set to 1 to work in NTSC. If the state of the PAL switch bit is wrong, a 180° phase shift occurs. Setting AD_NTSC_EN to 0 (default) disables the detection of standard NTSC. In a decoder/encoder back-to-back system in which SFL is used, this bit must be set up properly for the specific encoder used. Setting AD_NTSC_EN to 1 enables the detection of standard NTSC. Setting SFL_INV to 0 (default) makes the part SFL compatible with the ADV717x and ADV73xx video encoders. Setting AD_PALM_EN to 1 enables the detection of PAL M. AD_PAL_EN, PAL B/PAL D/PAL I/PAL G/PAL H Autodetect Enable, Address 0x07[0] Setting SFL_INV to 1 makes the part SFL compatible with the older video encoders. Setting AD_PAL_EN to 0 (default) disables the detection of standard PAL. Setting AD_PAL_EN to 1 enables the detection of standard PAL. Rev. A | Page 32 of 104 ADV7280/ADV7281/ADV7282/ADV7283 Hardware Reference Manual SELECT THE RAW LOCK SIGNAL SRLS 1 0 FILTER THE RAW LOCK SIGNAL CIL[2:0], COL[2:0] 0 1 fSC LOCK COUNTER INTO LOCK COUNTER OUT OF LOCK STATUS 1[0] MEMORY STATUS 1[1] 11935-020 TIME_WIN FREE_RUN UG-637 TAKE fSC LOCK INTO ACCOUNT FSCLE Figure 21. Lock Related Signal Path Lock Related Controls CIL[2:0], Count into Lock, Address 0x51[2:0] Lock information is presented to the user through Bits[2:0] of the Status 1 register (see the Status 1[7:0], Address 0x10[7:0] section). Figure 21 outlines the signal flow and the controls that are available to influence the way the lock status information is generated. CIL[2:0] determines the number of consecutive lines for which the lock condition must be true before the system switches into the locked state and reports this via Status 1[1:0]. The bit counts the value in lines of video. SRLS, Select Raw Lock Signal, Address 0x51[6] Table 35. CIL Function Using the SRLS bit, the user can choose between two sources for determining the lock status (per Bits[1:0] in the Status 1 register). See Figure 21. CIL[2:0] 000 001 010 011 100 (default) 101 110 111 • • The TIME_WIN signal is based on a line-to-line evaluation of the horizontal synchronization pulse of the incoming video. It reacts quickly. The FREE_RUN signal evaluates the properties of the incoming video over several fields, taking vertical synchronization information into account. Number of Video Lines 1 2 5 10 100 500 1000 100,000 COL[2:0], Count Out of Lock, Address 0x51[5:3] Setting SRLS to 0 (default) selects the FREE_RUN signal (to evaluate over several fields). Setting SRLS to 1 selects the TIME_WIN signal (to evaluate on a line-to-line basis). FSCLE, fSC Lock Enable, Address 0x51[7] The FSCLE bit allows the user to choose whether the status of the color subcarrier loop is taken into account when the overall lock status is determined and presented via Bits[1:0] in the Status 1 register. This bit must be set to 0 when operating the ADV728x in YPrPb component mode to generate a reliable HLOCK status bit. When FSCLE is set to 0 (default), the overall lock status is dependent only on horizontal sync lock. When FSCLE is set to 1, the overall lock status is dependent on horizontal sync lock and fSC lock. COL[2:0] determines the number of consecutive lines for which the out-of-lock condition must be true before the system switches into the unlocked state and reports this via Status 1[1:0]. It counts the value in lines of video. Table 36. COL Function COL[2:0] 000 001 010 011 100 (default) 101 110 111 Rev. A | Page 33 of 104 Number of Video Lines 1 2 5 10 100 500 1000 100,000 UG-637 ADV7280/ADV7281/ADV7282/ADV7283 Hardware Reference Manual COLOR CONTROLS SD_OFF_Cr[7:0], SD Offset Cr Channel, Address 0xE2[7:0] These registers allow the user to control picture appearance, including control of active data in the event of video being lost. These controls are independent of any other controls. For instance, brightness control is independent of picture clamping, although both controls affect the dc level of the signal. This register allows the user to select an offset for the Cr channel only and to adjust the hue of the picture. There is a functional overlap with the HUE[7:0] register. Table 41. SD_OFF_Cr Function This register allows the user to control contrast adjustment of the picture. SD_OFF_Cr[7:0] 0x80 (default) 0x00 0xFF Table 37. CON Function BRI[7:0], Brightness Adjust, Address 0x0A[7:0] CON[7:0], Contrast Adjust, Address 0x08[7:0] CON[7:0] 0x80 (default) 0x00 0xFF Description Gain on luma channel = 1 Gain on luma channel = 0 Gain on luma channel = 2 This register controls the brightness of the video signal. It allows the user to adjust the brightness of the picture. Table 42. BRI Function SD_SAT_Cb[7:0], SD Saturation Cb Channel, Address 0xE3[7:0] This register allows the user to control the gain of the Cb channel only, which in turn adjusts the saturation of the picture. Table 38. SD_SAT_Cb Function SD_SAT_Cb[7:0] 0x80 (default) 0x00 0xFF BRI[7:0] 0x00 (default) 0x7F 0x80 HUE[7:0], Hue Adjust, Address 0x0B[7:0] HUE[7:0] has a range of ±90°, with 0x00 equivalent to an adjustment of 0°. The resolution of HUE[7:0] is 1 bit = 0.7°. This register allows the user to control the gain of the Cr channel only, which in turn adjusts the saturation of the picture. Table 39. SD_SAT_Cr Function The hue adjustment value is fed into the AM color demodulation block. Therefore, it applies only to video signals that contain chroma information in the form of an AM-modulated carrier (CVBS or Y/C in PAL or NTSC). It does not affect SECAM and does not work on component video inputs (YPrPb). Table 43. HUE Function Description Gain on Cr channel = 0 dB Gain on Cr channel = −42 dB Gain on Cr channel = +6 dB HUE[7:0] 0x00 (default) 0x7F 0x80 SD_OFF_Cb[7:0], SD Offset Cb Channel, Address 0xE1[7:0] This register allows the user to select an offset for the Cb channel only and to adjust the hue of the picture. There is a functional overlap with the HUE[7:0] register (Address 0x0B). Table 40. SD_OFF_Cb Function SD_OFF_Cb[7:0] 0x80 (default) 0x00 0xFF Description Offset of the luma channel = 0 IRE Offset of the luma channel = +30 IRE Offset of the luma channel = −30 IRE This register contains the value for the color hue adjustment. It allows the user to adjust the hue of the picture. Description Gain on Cb channel = 0 dB Gain on Cb channel = −42 dB Gain on Cb channel = +6 dB SD_SAT_Cr[7:0], SD Saturation Cr Channel, Address 0xE4[7:0] SD_SAT_Cr[7:0] 0x80 (default) 0x00 0xFF Description 0 mV offset applied to the Cr channel −312 mV offset applied to the Cr channel +312 mV offset applied to the Cr channel Description 0 mV offset applied to the Cb channel −312 mV offset applied to the Cb channel +312 mV offset applied to the Cb channel Rev. A | Page 34 of 104 Description (Adjust Hue of the Picture) Phase of the chroma signal = 0° Phase of the chroma signal = −90° Phase of the chroma signal = +90° ADV7280/ADV7281/ADV7282/ADV7283 Hardware Reference Manual UG-637 DEF_Y[5:0], Default Value Y, Address 0x0C[7:2] Single Color Test Pattern When the ADV728x loses lock on the incoming video signal or when there is no input signal, the DEF_Y[5:0] register allows the user to specify a default luma value to be output. This value is used under the following conditions: In this mode, the ADV728x device can be set to output the default luma and chroma data stored in DEF_Y and DEF_C (see the Color Controls section).  In this mode, the ADV728x device outputs the 100% color bars pattern.  If the DEF_VAL_AUTO_EN bit is set to 1 and the ADV728x has lost lock to the input video signal, this is the intended mode of operation (automatic mode). If the DEF_VAL_EN bit is set to 1, regardless of the lock status of the video decoder, this is a forced mode that may be useful during configuration. The DEF_Y[5:0] values define the six MSBs of the output video. The remaining LSBs are padded with 0s. For example, in 8-bit mode, the output is Y[7:0] = (DEF_Y[5:0], 0, 0). For DEF_Y[5:0], 0x0D (blue) is the default value for Y. Color Bars Test Pattern Luma Ramp Test Pattern In this mode, the ADV728x device outputs a series of vertical bars. Each vertical bar is progressively brighter than the vertical bar to its left. Boundary Box Test Pattern In this mode, the ADV728x device outputs a black screen with a 1-pixel depth white border (see Figure 22). Register 0x0C has a default value of 0x36. DEF_C[7:0], Default Value C, Address 0x0D[7:0] The DEF_C[7:0] register complements the DEF_Y[5:0] value. It defines the four MSBs of Cr and Cb values to be output if:  The DEF_VAL_AUTO_EN bit is set to high and the ADV728x cannot lock to the input video (automatic mode). The DEF_VAL_EN bit is set to high (forced output). 11935-021  Figure 22. Boundary Box Free-Run Test Pattern The data that is finally output from the ADV728x for the chroma side is Cr[4:0] = (DEF_C[7:4]) and Cb[4:0] = (DEF_C[3:0]). DEF_VAL_AUTO_EN, Default Value Automatic Enable, User Map, Address 0x0C[1] For DEF_C[7:0], 0x7C (blue) is the default value for Cr and Cb. This bit enables the ADV728x to enter free-run mode if it cannot decode the video signal that has been input. FREE-RUN OPERATION Table 44. DEF_VAL_AUTO_EN Function Free-run mode provides the user with a stable clock and predictable data if the input signal cannot be decoded, for example, if input video is not present. DEF_VAL_AUTO_EN 0 The ADV728x automatically enters free-run mode if the input signal cannot be decoded. The user can prevent this operation by setting the DEF_VAL_AUTO_EN to 0. When the DEF_VAL_ AUTO_EN bit is set to 0, the ADV728x outputs noise if it cannot decode the input video. It is recommended that the user keep DEF_VAL_AUTO_EN set to 1. The user can force free-run mode by setting the DEF_VAL_EN bit to 1. This can be a useful tool in debugging system level issues. The VID_SEL[3:0] bits can be used to force the video standard output in free-run mode (see the Video Standard Selection section). 1 (default) DEF_VAL_EN, Default Value Enable, User Map, Address 0x0C[0] This bit forces free-run mode. Table 45. DEF_VAL_EN Function DEF_VAL_EN 0 (default) 1 The user can also specify which data is output in free-run mode with the FREE_RUN_PAT_SEL bits. The following test patterns can be set using this function:     Description The ADV728x outputs noise if it loses lock with the inputted video signal. The ADV728x enters free-run mode if it loses lock with the inputted video signal. Single color Color bars Luma ramp Boundary box Rev. A | Page 35 of 104 Description Do not force free-run mode (that is, free-run mode dependent on DEF_VAL_AUTO_EN) Force free-run mode UG-637 ADV7280/ADV7281/ADV7282/ADV7283 Hardware Reference Manual The clamping can be divided into two sections. FREE_RUN_PAT_SEL[2:0], Free Run Pattern Select, User Map, Address 0x14[2:0]  This function selects what data is output in free-run mode.  Table 46. FREE_FUN_PAT_SEL Function 001 010 101 Description Single color set by DEF_C and DEF_Y controls; see the Color Controls section 100% color bars Luma ramp. Note that to display properly, the DEF_C register should be set to 0x88; see the Color Controls section Boundary box The primary task of the analog clamping circuits is to ensure that the video signal stays within the valid 1.0 V ADC input window so that the analog-to-digital conversion can take place. The current sources in the AFE correct the dc level of the ac-coupled input video signal before it is fed into the ADC. The digitized data from the ADC is then fed into the video processor. The digital fine clamp block within the video processor corrects for any remaining variation in the dc level. The video processor also sends clamp control signals to the current sources. This feedback loop fine tunes the current clamp operation and compensates for any noise on the input video signal. This maintains the dc level of the video signal during normal operation. CLAMP OPERATION The input video is ac-coupled into the ADV728x. This has the advantage of protecting the ADV728x from STB events. However, the dc value of the input video needs to be restored. This process is referred to as clamping the video. This section explains the general process of clamping on the ADV728x in both singleended and differential modes. This section also shows the different ways in which a user can configure clamp operation behavior. Differential CVBS Clamping Operation This section applies to the ADV7281, ADV7281-M, ADV7281-MA, ADV7282, ADV7282-M, and ADV7283 models only. Single-Ended CVBS Clamp Operation The ADV728x uses a combination of current sources and a digital processing block for clamping as shown in Figure 23. The analog processing channel shown is replicated three times inside the IC. While only a single channel is needed for a singleended CVBS signal, two independent channels are needed for Y/C (SVHS) type signals, and three independent channels are needed to allow component signals (YPrPb) to be processed. The differential clamping operation works in a similar manner to the single-ended clamping operation (see the Single-Ended CVBS Clamp Operation section). In differential mode, a coarse clamp pulls the positive and negative video input to a commonmode voltage VCML (see Figure 24). The feedback loop between the current clamps and the video processor fine tunes this coarse dc offset and makes the clamping robust to noise on the video input. Note that the current clamps are controlled within a feedback loop between the AFE and the video processor; the coarse clamps are not. ADV728x ANALOG FRONT END (AFE) EXTERNAL AC COUPLING CAPACITOR CLAMP CONTROL ADC CURRENT SOURCE CLAMPS DATA PREPROCESSOR VIDEO PROCESSOR WITH DIGITAL FINE CLAMP 11935-022 SINGLE-ENDED ANALOG VIDEO INPUT DIGITAL CORE Figure 23. Single-Ended Clamping Overview ADV728x ANALOG FRONT END (AFE) EXTERNAL AC COUPLING CAPACITOR CLAMP CONTROL COARSE CLAMP ADC POSITIVE DIFFERENTIAL ANALOG VIDEO INPUT NEGATIVE DIFFERENTIAL ANALOG VIDEO INPUT EXTERNAL AC COUPLING CAPACITOR VCML DIGITAL CORE DATA PREPROCESSOR CURRENT SOURCE CLAMPS VIDEO PROCESSOR WITH DIGITAL FINE CLAMP CURRENT SOURCE CLAMPS COARSE CLAMP CLAMP CONTROL Figure 24. Differential Clamping Overview Rev. A | Page 36 of 104 11935-023 FREE_RUN_PAT_SEL 000 (default) Clamping before the ADC (analog domain): current sources and voltage sources. Clamping after the ADC (digital domain): digital processing block. ADV7280/ADV7281/ADV7282/ADV7283 Hardware Reference Manual Clamp Operation Controls • The following sections describe the I2C signals that can be used to influence the behavior of the clamping block. CCLEN, Current Clamp Enable, Address 0x14[4] The current clamp enable bit allows the user to switch off all the current sources in the AFE simultaneously. This may be useful if the incoming analog video signal is clamped externally. When CCLEN is set to 0, the current sources are switched off. When CCLEN is set to 1 (default), the current sources are enabled. DCT[1:0], Digital Clamp Timing, Address 0x15[6:5] The clamp timing register determines the time constant of the digital fine clamp circuitry. Note that the digital fine clamp reacts quickly because it immediately corrects any residual dc level error for the active line. The time constant from the digital fine clamp must be much quicker than the one from the analog blocks. By default, the time constant of the digital fine clamp is adjusted dynamically to suit the currently connected input signal. Table 47. DCT Function DCT[1:0] 00 (default) 01 10 11 Description Slow (TC = 1 sec) Medium (TC = 0.5 sec) Fast (TC = 0.1 sec) Determined by ADV728x, depending on the input video parameters Luma shaping filters (YSH). The shaping filter block is a programmable low-pass filter with a wide variety of responses. It can be used to reduce selectively the luma video signal bandwidth (needed prior to scaling, for example). For some video sources that contain high frequency noise, reducing the bandwidth of the luma signal improves visual picture quality. If the video is low-pass filtered, a follow-on video compression stage can work more efficiently. The ADV728x has two responses for the shaping filter: one that is used for good quality composite, component, and SVHS type sources; and a second for nonstandard CVBS signals. The YSH filter responses also include a set of notches for PAL and NTSC. However, using the comb filters for Y/C separation is recommended. Digital resampling filter. This block allows dynamic resampling of the video signal to alter parameters such as the time base of a line of video. Fundamentally, the resampler is a set of low-pass filters. The actual response is chosen by the system with no requirement for user intervention. Figure 26 through Figure 29 show the overall response of all filters together. Unless otherwise noted, the filters are set into a typical wideband mode. Y Shaping Filter DCFE, Digital Clamp Freeze Enable, Address 0x15[4] This register bit allows users to freeze the digital clamp loop at any time (do their own clamping). Users can disable the current sources for analog clamping via the appropriate register bits, wait until the digital clamp loop settles, and then freeze it via the DCFE bit. When DCFE is set to 0 (default), the digital clamp is operational. When DCFE is set to1, the digital clamp loop is frozen. LUMA FILTER Data from the digital fine clamp block is processed by the three sets of filters that follow. The data format at this point is CVBS for CVBS input or luma only for Y/C and YPrPb input formats. • • UG-637 Luma antialias filter (YAA). The ADV728x receives video at a rate of 28.6363 MHz. (In the case of 4× oversampled video, the ADC samples at 57.27 MHz, and the first decimation is performed inside the DPP filters. Therefore, the data rate into the ADV728x is always 28.6363 MHz.) The ITU-R BT.601 recommends a sampling frequency of 13.5 MHz. The luma antialias filter decimates the oversampled video using a high quality linear phase, low-pass filter that preserves the luma signal while, at the same time, attenuating out-ofband components. The luma antialias filter (YAA) has a fixed response. For input signals in CVBS format, the luma shaping filters play an essential role in removing the chroma component from a composite signal. Y/C separation must aim for the best possible crosstalk reduction while still retaining as much bandwidth (especially on the luma component) as possible. High quality Y/C separation can be achieved by using the internal comb filters of the ADV728x. Comb filtering, however, relies on the frequency relationship of the luma component (multiples of the video line rate) and the color subcarrier (fSC). For good quality CVBS signals, this relationship is known; the comb filter algorithms can be used to separate luma and chroma with high accuracy. In the case of nonstandard video signals, the frequency relationship may be disturbed, and the comb filters may not be able to remove all crosstalk artifacts in the best fashion without the assistance of the shaping filter block. An automatic mode is provided that allows the ADV728x to evaluate the quality of the incoming video signal and select the filter responses in accordance with the signal quality and video standard. YFSM, WYSFMOVR, and WYSFM allow the user to manually override the automatic decisions in part or in full. The luma shaping filter has the following control bits. • • Rev. A | Page 37 of 104 YSFM[4:0] allows the user to manually select a shaping filter mode (applied to all video signals) or to enable an automatic selection (depending on video quality and video standard). WYSFMOVR allows the user to manually override the WYSFM decision.  ADV7280/ADV7281/ADV7282/ADV7283 Hardware Reference Manual The Y-shaping filter mode operates as follows: WYSFM[4:0] allows the user to select a different shaping filter mode for good quality composite (CVBS), component (YPrPb), and SVHS (Y/C) input signals.  In automatic mode, the system preserves the maximum possible bandwidth for good CVBS sources (because they can be successfully combed) as well as for luma components of YPrPb and Y/C sources (because they need not be combed). For poor quality signals, the system selects from a set of proprietary shaping filter responses that complements comb filter operation to reduce visual artifacts.  If the YSFM settings specify a filter (that is, YSFM is set to values other than 00000 or 00001), the chosen filter is applied to all video, regardless of its quality. In automatic selection mode, the notch filters are only used for bad quality video signals. For all other video signals, wideband filters are used. WYSFMOVR, Wideband Y Shaping Filter Override, Address 0x18[7] Setting the WYSFMOVR bit enables the use of the WYSFM[4:0] settings for good quality video signals. For more information on luma shaping filters, see the Y Shaping Filter section and the flowchart shown in Figure 25. The decisions of the control logic are shown in Figure 25. YSFM[4:0], Y Shaping Filter Mode, Address 0x17[4:0] The Y shaping filter mode bits allow the user to select from a wide range of low-pass and notch filters. When switched in automatic mode, the filter selection is based on other register selections, such as detected video standard, as well as properties extracted from the incoming video itself, such as quality and time base stability. The automatic selection always selects the widest possible bandwidth for the video input encountered (see Table 48). When WYSFMOVR is set to 0, the shaping filter for good quality video signals is selected automatically. When WYSFMOVR is set to 1 (default), it enables manual override via WYSFM[4:0]. SET YSFM YES YSFM IN AUTO MODE? 00000 OR 00001 NO VIDEO QUALITY BAD GOOD AUTO SELECT LUMA SHAPING FILTER TO COMPLEMENT COMB USE YSFM SELECTED FILTER REGARDLESS OF VIDEO QUALITY WYSFMOVR 1 0 SELECT WIDEBAND FILTER AS PER WYSFM[4:0] SELECT AUTOMATIC WIDEBAND FILTER Figure 25. YSFM and WYSFM Control Flowchart Rev. A | Page 38 of 104 11935-024 UG-637 ADV7280/ADV7281/ADV7282/ADV7283 Hardware Reference Manual Table 48. YSFM Function YSFM[4:0] 00000 00001 (default) 00010 00011 00100 00101 00110 00111 01000 01001 01010 01011 01100 01101 01110 01111 10000 10001 10010 10011 10100 10101 10110 10111 11000 11001 11010 11011 11100 11101 11110 11111 Description Automatic selection including a wide notch response (PAL/NTSC/SECAM) Automatic selection including a narrow notch response (PAL/NTSC/SECAM) SVHS 1 SVHS 2 SVHS 3 SVHS 4 SVHS 5 SVHS 6 SVHS 7 SVHS 8 SVHS 9 SVHS 10 SVHS 11 SVHS 12 SVHS 13 SVHS 14 SVHS 15 SVHS 16 SVHS 17 SVHS 18 (CCIR 601) PAL NN1 PAL NN2 PAL NN3 PAL WN1 PAL WN2 NTSC NN1 NTSC NN2 NTSC NN3 NTSC WN1 NTSC WN2 NTSC WN3 Reserved UG-637 WYSFM[4:0], Wideband Y Shaping Filter Mode, Address 0x18[4:0] The WYSFM[4:0] bits allow the user to manually select a shaping filter for good quality video signals, such as CVBS with stable time base, luma component of YPrPb, and luma component of Y/C. The WYSFM bits are active only if the WYSFMOVR bit is set to 1. See the general discussion of the shaping filter settings in the Y Shaping Filter section. Table 49. WYSFM Function WYSFM[4:0] 00000 00001 00010 00011 00100 00101 00110 00111 01000 01001 01010 01011 01100 01101 01110 01111 10000 10001 10010 10011 (default) 10100 to 11111 Rev. A | Page 39 of 104 Description Reserved, do not use Reserved, do not use SVHS 1 SVHS 2 SVHS 3 SVHS 4 SVHS 5 SVHS 6 SVHS 7 SVHS 8 SVHS 9 SVHS 10 SVHS 11 SVHS 12 SVHS 13 SVHS 14 SVHS 15 SVHS 16 SVHS 17 SVHS 18 (CCIR 601) Reserved, do not use UG-637 ADV7280/ADV7281/ADV7282/ADV7283 Hardware Reference Manual The filter plots in Figure 26 show the SVHS 1 (narrowest) to SVHS 18 (widest) shaping filter settings. Figure 28 shows the PAL notch filter responses. The NTSC notch filter responses are shown in Figure 29. 0 –10 –20 –20 –30 –40 –60 –80 –100 –40 –120 0 2 4 –50 6 8 10 12 FREQUENCY (MHz) 11935-026 AMPLITUDE (dB) 0 AMPLITUDE (dB) COMBINED Y ANTIALIAS, SVHS LOW-PASS FILTERS, Y RESAMPLE COMBINED Y ANTIALIAS, CCIR MODE SHAPING FILTER, Y RESAMPLE Figure 27. Combined Y Antialias, CCIR Mode Shaping Filter –60 0 2 4 6 8 10 12 FREQUENCY (MHz) COMBINED Y ANTIALIAS, PAL NOTCH FILTERS, Y RESAMPLE 11935-025 –70 0 Figure 26. Y SVHS Combined Responses –10 • Figure 30 shows the overall response of all filters together. –30 –40 –50 –60 –70 0 2 4 6 8 10 12 FREQUENCY (MHz) 11935-027 • Chroma antialias filter (CAA). The ADV728x oversamples the CVBS by a factor of 4 and the chroma/YPrPb by a factor of 2. A decimating filter (CAA) is used to preserve the active video band and to remove any out-of-band components. The CAA filter has a fixed response. Chroma shaping filters (CSH). The shaping filter block (CSH) can be programmed to perform a variety of low-pass responses. It can be used to selectively reduce the bandwidth of the chroma signal for scaling or compression. Digital resampling filter. This block allows dynamic resampling of the video signal to alter parameters,0 such as the time base of a line of video. Fundamentally, the resampler is a set of low-pass filters. The actual response is chosen by the system without user intervention. –20 Figure 28. Combined Y Antialias, PAL Notch Filters COMBINED Y ANTIALIAS, NTSC NOTCH FILTERS, Y RESAMPLE 0 –10 –20 –30 –40 –50 –60 –70 0 2 4 6 8 10 12 FREQUENCY (MHz) Figure 29. Combined Y Antialias Filter, NTSC Notch Filters Rev. A | Page 40 of 104 11935-028 • AMPLITUDE (dB) Data from the digital fine clamp block is processed by the three sets of filters that follow. The data format at this point is CVBS for CVBS (or differential CVBS) inputs, chroma only for Y/C, or U/V interleaved for YPrPb input formats. AMPLITUDE (dB) CHROMA FILTER ADV7280/ADV7281/ADV7282/ADV7283 Hardware Reference Manual As shown in Figure 33, the ADV728x can decode a video signal as long as it fits into the ADC window. The components for this are the amplitude of the input signal and the dc level it resides on. The dc level is set by the clamping circuitry (see the Clamp Operation section). COMBINED C ANTIALIAS, C SHAPING FILTER, C RESAMPLER 0 –10 –20 If the amplitude of the analog video signal is too high, clipping may occur, resulting in visual artifacts. The analog input range of the ADC, together with the clamp level, determines the maximum supported amplitude of the video signal. –40 –60 0 1 2 3 4 5 6 FREQUENCY (MHz) 11935-029 –50 Figure 30. Chroma Shaping Filter Responses CSFM[2:0], C Shaping Filter Mode, Address 0x17[7:5] The C shaping filter mode bits allow the user to select from a range of low-pass filters for the chrominance signal. When switched in automatic mode, the widest filter is selected based on the video standard/format and user choice (see the 000 and 001 settings in Table 50). Figure 31 and Figure 32 show the typical voltage divider networks required to keep the input video signal within the allowed range of the ADC, 0 V to 1 V. The circuit in Figure 31 should be placed before all the single-ended analog inputs to the ADV728x, and place the circuit in Figure 32 before all the differential inputs to the ADV728x. Note differential inputs can only be applied directly to the ADV7281, ADV7281-M, ADV7281-MA, ADV7282, ADV7282-M, and ADV7283 models. ANALOG VIDEO INPUT AIN 24Ω Table 50. CSFM Function CSFM[2:0] 000 (default) 001 010 011 100 101 110 111 100nF 11935-030 –30 51Ω Figure 31. Single-Ended Input Voltage Divider Network Description Autoselection 1.5 MHz bandwidth Autoselection 2.17 MHz bandwidth SH1 SH2 SH3 SH4 SH5 Wideband mode ANALOG_INPUT CVBS_1P 1.3kΩ 0.1µF AINx 430Ω 75Ω ANALOG_INPUT CVBS_1N 1.3kΩ 430Ω 0.1µF AINx 11935-031 ATTENUATION (dB) UG-637 Figure 32. Differential Input Voltage Divider Network Figure 30 shows the responses of SH1 (narrowest) to SH5 (widest) in addition to the wideband mode (shown in red). The minimum supported amplitude of the input video is determined by the ability of the ADV728x to retrieve horizontal and vertical timing and to lock to the color burst, if present. GAIN OPERATION The gain control within the ADV728x is done on a purely digital basis. The input ADC supports a 10-bit range mapped into a 1.0 V analog voltage range. Gain correction takes place after the digitization in the form of a digital multiplier. There are separate gain control units for luma and chroma data. Both can operate independently of each other. The chroma unit, however, can also take its gain value from the luma path. Advantages of this architecture over the commonly used programmable gain amplifier (PGA) before the ADC include the fact that the gain is now completely independent of supply, temperature, and process variations. Rev. A | Page 41 of 104 ADV7280/ADV7281/ADV7282/ADV7283 Hardware Reference Manual The possible AGC modes are shown in Table 51. Table 51. AGC Modes Input Video Type Any CVBS Luma Gain Manual gain luma Dependent on horizontal sync depth Peak white Y/C Dependent on horizontal sync depth Peak white YPrPb Dependent on horizontal sync depth Chroma Gain Manual gain chroma Dependent on colorburst amplitude taken from luma path Dependent on colorburst amplitude taken from luma path Dependent on colorburst amplitude taken from luma path Dependent on colorburst amplitude Taken from luma path It is possible to freeze the automatic gain control loops. This causes the loops to stop updating and the AGC determined gain at the time of the freeze to stay active until the loop is either unfrozen or the gain mode of operation is changed. The currently active gain from any of the modes can be read back. Refer to the description of the dual-function manual gain registers, LG[11:0] luma gain and CG[11:0] chroma gain, in the Luma Gain section and Chroma Gain section, respectively. ANALOG VOLTAGE RANGE SUPPORTED BY ADC (1V RANGE FOR ADV7182) MAXIMUM VOLTAGE VIDEO PROCESSOR (GAIN SELECTION ONLY) ADC DATA PREPROCESSOR (DPP) GAIN CONTROL MINIMUM VOLTAGE CLAMP LEVEL Figure 33. Gain Control Overview Rev. A | Page 42 of 104 11935-032 UG-637 ADV7280/ADV7281/ADV7282/ADV7283 Hardware Reference Manual UG-637 Luma Gain LAGC[2:0], Luma Automatic Gain Control, Address 0x2C[6:4] LG[11:0], Luma Gain, Address 0x2F[3:0], Address 0x30[7:0] The luma automatic gain control mode bits select the operating mode for the gain control in the luma path. Luma gain[11:0] is a dual-function register. If all of these bits are written to, a desired manual luma gain can be programmed. This gain becomes active if the LAGC[2:0] mode is switched to manual fixed gain. Equation 1 shows how to calculate a desired gain. LMG[11:0], Luma Manual Gain, Address 0x2F[3:0], Address 0x30[7:0] The peak white algorithm is used to detect if the input video amplitude exceeds the ADC input range of the ADV728x. If this is so, then the ADV728x reduces its internal luma gain to prevent the signal from becoming saturated. Table 52. LAGC Function LAGC[2:0] 000 001 010 (default) 011 100 101 110 111 Description Manual fixed gain (use LMG[11:0]) AGC (blank level to sync tip), peak white algorithm off AGC (blank level to sync tip), peak white algorithm on Reserved Reserved Reserved Reserved Freeze gain LAGT[1:0], Luma Automatic Gain Timing, Address 0x2F[7:6] • • Luma manual gain value (LAGC[2:0] set to luma manual gain mode) Luma automatic gain value (LAGC[2:0] set to either of the automatic modes) Table 54. LG/LMG Function LG[11:0]/LMG[11:0] LMG[11:0] = x LG[11:0] = x Luma Gain ≅ The luma automatic gain timing register allows the user to influence the tracking speed of the luminance automatic gain control. This register has an effect only if the LAGC[2:0] register is set to 001 or 010 (automatic gain control modes). If peak white AGC is enabled and active (see the Status 1[7:0], Address 0x10[7:0] section), the actual gain update speed is dictated by the peak white AGC loop and, as a result, the LAGT settings have no effect. As soon as the part leaves peak white AGC, LAGT becomes relevant again. The update speed for the peak white algorithm can be customized by the use of internal parameters. Description Slow (time constant = 2 sec) Medium (time constant = 1 sec) Fast (time constant = 0.2 sec) Adaptive Read/Write Write Read Description Manual gain for luma path Actual used gain LMG[11 : 0] Luma Calibration Factor (1) where LMG[11:0] is a decimal value between 1024 and 4095. Calculation of the Luma Calibration Factor 1. 2. 3. 4. Table 53. LAGT Function LAGT[1:0] 00 01 10 11 (default) If read back, this register returns the current gain value. Depending on the setting in the LAGC[2:0] bits, the value is one of the following: Using a video source, set the content to a gray field and apply a standard CVBS signal to the CVBS input of the board. Using an oscilloscope, measure the signal at the CVBS input to ensure that its sync depth, color burst, and luma are at the standard levels. Connect the output of the ADV728x to a backend system that has unity gain and monitor the output voltage. Measure the luma level correctly from the black level. Turn off the luma AGC and manually change the value of the luma manual gain control register, LMG[11:0], until the output luma level matches the input measured in Step 2. This value, in decimal, is the luma calibration factor. PW_UPD, Peak White Update, Address 0x2B[0] The peak white and average video algorithms determine the gain based on measurements taken from the active video. The PW_UPD bit determines the rate of gain change. LAGC[2:0] must be set to the appropriate mode to enable the peak white or average video mode in the first place. For more information, see the LAGC[2:0], Luma Automatic Gain Control, Address 0x2C[6:4] section. Setting PW_UPD to 0 updates the gain once per video line. Setting PW_UPD to 1 (default) updates the gain once per field. Chroma Gain CAGC[1:0], Chroma Automatic Gain Control, Address 0x2C[1:0] The two bits of the color automatic gain control mode select the basic mode of operation for the automatic gain control in the chroma path. Table 55. CAGC Function CAGC[1:0] 00 01 10 (default) 11 Rev. A | Page 43 of 104 Description Manual fixed gain (use CMG[11:0]) Use luma gain for chroma Automatic gain (based on color burst) Freeze chroma gain UG-637 ADV7280/ADV7281/ADV7282/ADV7283 Hardware Reference Manual CAGT[1:0], Chroma Automatic Gain Timing, Address 0x2D[7:6] CKE, Color Kill Enable, Address 0x2B[6] The color kill enable bit allows the optional color kill function to be switched on or off. The chroma automatic gain timing register allows the user to influence the tracking speed of the chroma automatic gain control. This register has an effect only if the CAGC[1:0] bits are set to 10 (automatic gain). For QAM-based video standards (PAL and NTSC), as well as FM-based systems (SECAM), the threshold for the color kill decision is selectable via the CKILLTHR[2:0] bits. If color kill is enabled and the color carrier of the incoming video signal is less than the threshold for 128 consecutive video lines, color processing is switched off (black and white output). To switch the color processing back on, another 128 consecutive lines with a color burst greater than the threshold are required. Table 56. CAGT Function CAGT[1:0] 00 01 10 11 (default) Description Slow (time constant = 2 sec) Medium (time constant = 1 sec) Reserved Adaptive The color kill option works only for input signals with a modulated chroma part. For component input (YPrPb), there is no color kill. CG[11:0], Chroma Gain, Address 0x2D[3:0], Address 0x2E[7:0]; CMG[11:0], Chroma Manual Gain, Address 0x2D[3:0], Address 0x2E[7:0] Set CKE to 0 to disable color kill. Set CKE to 1 (default) to enable color kill. CKILLTHR[2:0], Color Kill Threshold, Address 0x3D[6:4] Chroma gain[11:0] is a dual-function register. If written to, a desired manual chroma gain can be programmed. This gain becomes active if the CAGC[1:0] function is switched to manual fixed gain. See Equation 2 for calculating a desired gain. The CKILLTHR[2:0] bits allow the user to select a threshold for the color kill function. The threshold applies only to QAM-based (NTSC and PAL) or FM-modulated (SECAM) video standards. If read back, this register returns the current gain value. Depending on the setting in the CAGC[1:0] bits, this is either: • • The chroma manual gain value (CAGC[1:0] set to chroma manual gain mode). The chroma automatic gain value (CAGC[1:0] set to either of the automatic modes). Table 57. CG/CMG Function CG[11:0]/CMG[11:0] CMG[11:0] CG[11:0] Chroma_Gain ≅ Read/Write Write Read Description Manual gain for chroma path Currently active gain CMG[11 : 0]decimal ChromaCalibrationFactor (2) where ChromaCalibrationFactor is a decimal value between 0 and 4095. To enable the color kill function, the CKE bit must be set. For the 000, 001, 010, and 011 settings, chroma demodulation inside the ADV728x may not work satisfactorily for poor input video signals. Table 58. CKILLTHR Function CKILLTHR[2:0] 000 001 010 (default) 011 100 101 110 111 Description NTSC, PAL SECAM Kill at