Hdmi edid 数据解析.doc

Hdmi edid 数据解析2011-06-01 10:14:01|分类： embedded linux |标签： |字号大中小订阅 一.EDID数据格式：EDID 1.3 data formatByte sequence 00-19 Header information0007 Header information 00h FFh FFh FFh FFh FFh FFh 00h0809 Manufacturer ID. These IDs are assigned by Microsoft. 00001=A”; “00010=B”; . “11010=Z”. Bit 7 (at address 08h) is 0, the first character (letter) is located at bits 6 2 (at address 08h), the second character (letter) is located at bits 1 & 0 (at address 08h) and bits 7 5 (at address 09h), and the third character (letter) is located at bits 4 0 (at address 09h).1011 Product ID Code (stored as LSB first). Assigned by manufacturer.1215 32-bit Serial Number. No requirement for the format. Usually stored as LSB first. In order to maintain compatibility with previous requirements the field should set at least one byte of the field to be non-zero if an ASCII serial number descriptor is provided in the detailed timing section.16 Week of Manufacture. This varies by manufacturer. One way is to count January 17 as week 1, January 815 as week 2 and so on. Some count based on the week number (Sunday-Saturday). Valid range is 1-54.17 Year of Manufacture. Add 1990 to the value for actual year.18 EDID Version Number 01h19 EDID Revision Number 03h20-24 Basic display parameters20 Video input definition7 0=analog 1=digital6 video level 00=0.7, 0.3; 01=0.714, 0.286; 10=1, 0.4; 11=0.7, 054 blank-to-black setup3 separate syncs2 composite sync1 sync on green0 serration vsync 1=DFP 1.x compatible21 Maximum Horizontal Image Size (in centimeters).22 Maximum Vertical Image Size (in centimetres).23 Display Gamma. Divide by 100, then add 1 for actual value.24 Power Management and Supported Feature(s):7 standby6 suspend5 active-off/low power4 Display type: 00=monochrome, 01=RGB colour, 10=non RGB multicolour, 11=undefined32 standard colour space1 preferred timing mode0 default GTF supported25-34 Chromaticity coordinates25 low significant bits for Red X (bit 7-6), Red Y (bit 5-4), Green X (bit 3-2), Green Y (bit 1-0).26 low significant bits for Blue X (bit 7-6), Blue Y (bit 5-4), White X (bit 3-2), White Y (bit 1-0).2734 high significant bits for Red X, Red Y, Green X, Green Y, Blue X, Blue Y, White X, White Y. To decode actual value, rearrange bits as follows: High significant bits 7-0 for (channel), low significant bits for (channel). Actual value is between 0.000 and 0.999, but encoded value is between 000h and 3FFh. Normalize by *999/1023.35 Established timing I: 72040070 Hz, 72040088 Hz, 64048060 Hz, 64048067 Hz, 64048072 Hz, 64048075 Hz, 80060056 Hz, 80060060 Hz36 Established timing II: 80060072 Hz, 80060075 Hz, 83262475 Hz, 102476887 Hz (Interlaced), 102476860 Hz, 102476870 Hz, 102476875 Hz, 1280102475 Hz37 Manufacturers reserved timing: 00h for nonebit 7: 1152x870 75 Hz (Mac II, Apple) 3853 Standard timing identificationFirst byte: Horizontal resolution. Multiply by 8, then add 248 for actual value.Second byte: bit 7-6Aspect ratio. Actual vertical resolution depends on horizontal resolution.00=16:10, 01=4:3, 10=5:4, 11=16:9 (00=1:1 prior to v1.3)bit 5-0Vertical frequency. Add 60 to get actual value. 5471 Descriptor Block 15455 Pixel Clock (in 10 kHz) or 0 (55 MSB 54 LSB) If Pixel Clock is non null:56: Horizontal Active (in pixels)57: Horizontal Blanking (in pixels)58: Horizontal Active high (4 upper bits)Horizontal Blanking high (4 lower bits)59: Vertical Active (in lines)60: Vertical Blanking (in lines)61: high significant bits for Vertical Active (4 upper bits)high significant bits for Vertical Blanking (4 lower bits)62: Horizontal Sync Offset (in pixels)63: Horizontal Sync Pulse Width (in pixels)64: Vertical Sync Offset (in lines) (4 upper bits)Vertical Sync Pulse Width (in lines) (4 lower bits)65: high significant bits for Horizontal Sync Offset (bit 7-6)high significant bits for Horizontal Sync Pulse Width (bit 5-4)high significant bits for Vertical Sync Offset (bit 3-2)high significant bits for Vertical Sync Pulse Width (bit 1-0)66: Horizontal Image Size (in mm)67: Vertical Image Size (in mm)68: high significant bits for Horizontal Image Size (4 upper bits)high significant bits for Vertical Image Size (4 lower bits)69: Horizontal Border (in pixels representing only one side)70: Vertical Border (in lines representing only one side)71: Interlaced or not (bit 7)Stereo or not (bit 6-5) (00 means not)Separate Sync or not (bit 4-3)Vertical Sync positive or not (bit 2)Horizontal Sync positive or not (bit 1)Stereo Mode (bit 0) (unused if 6-5 are 00)If Pixel Clock is null:56: 057: Block typeFFh=Monitor Serial Number, FEh=ASCII string, FDh=Monitor Range Limits, FCh=Monitor name, FBh=Colour Point Data, FAh, Standard Timing Data, F9h=Currently undefined, 0Fh=defined by manufacturer58: 05971: Descriptor block contents.If block type is FFh, FEh, or FCh, the entire area is a text string.If block type is FDh:5963:Min Vertical frequency, Max Vertical frequency, Min Horizontal frequency (in kHz), Max Horizontal frequency (in kHz), pixel clock (in MHz (multiply by 10 for actual value)6465: Secondary GTF toggleIf encoded value is 000A, bytes 59-63 are used. If encoded value is 0200, bytes 6771 are used.66: Start horizontal frequency (in kHz). Multiply by 2 for actual value.67: C. Divide by 2 for actual value.68-69: M (stored as LSB first).70: K71: J. Divide by 2 for actual value.If block type is FBh:59: W Index 0. If set to 0, bytes 60-63 are not used. If set to 1, 6063 are assigned to white point index #164: W Index 1. If set to 0, bytes 65-68 are not used. If set to 2, 6568 are assigned to white point index #2White point index structure:First bytebit 3-2: low significant bits for White X (bit 3-2), White Y (bit 1-0)Second to third byte: high significant bits for White X, White Y.Fourth byte: Gamma. Divide by 100, then add 1 for actual value.To decode White X and White Y, see bytes 25-34.If block type is FAh:5970: Standard Timing Identification. 2 bytes for each record.For structure details, see bytes 38-53. 7289 Descriptor Block 290107 Descriptor Block 3108125 Descriptor Block 4126 Extension Flag. This is the number of extension blocks which follow this block. Prior to EDID 1.3, it is ignored, and should be set to 0.127 Checksum. This byte should be programmed such that the sum of all 128 bytes equals 00h. CEA EDID Timing Extension Version 3 data format：Byte sequence00: Extension tag (which kind of extension block this is); 02h for CEA EDID01: Revision number (Version number); 03h for Version 302: Byte number d within this block where the 18-byte DTDs begin. If no non-DTD data is present in this extension block, the value should be set to 04h (the byte after next). If set to 00h,there are no DTDs present in this block and no non-DTD data.03: Number of DTDs present, other Version 2+ informationbit 7: 1 if display supports underscan, 0 if notbit 6: 1 if display supports basic audio, 0 if notbit 5: 1 if display supports YCbCr 4:4:4, 0 if notbit 4: 1 if display supports YCbCr 4:2:2, 0 if notbit 3.0: total number of native formats in the DTDs included in this block04: Start of Data Block Collection. If byte 02 is set to 04h, this is where the DTD collectionbegins. If byte 02 is set to another value, byte 04 is where the Data Block Collection begins,and the DTD collection follows immediately thereafter. The Data Block Collection contains one or more data blocks detailing video, audio, and speakerplacement information about the display. The blocks can be placed in any order, and the initialbyte of each block defines both its type and its length:bit 7.5: Block Type Tag (1 is audio, 2 is video, 3 is vendor specific, 4 is speakerallocation, all other values Reserved) bit 4.0: Total number of bytes in this block following this byteOnce one data block has ended, the next byte is assumed to be the beginning of the next datablock. This is the case until the byte (designated in Byte 02, above) where the DTDs are known to begin. Any Audio Data Block contains one or more 3-byte Short Audio Descriptors (SADs). Each SADdetails audio format, channel number, and bitrate/resolution capabilities of the display asfollows:SAD Byte 1 (format and number of channels):bit 7: Reserved (0)bit 6.3: Audio format code1 = Linear Pulse Code Modulation (LPCM)2 = AC-33 = MPEG1 (Layers 1 and 2)4 = MP35 = MPEG26 = AAC7 = DTS8 = ATRAC0, 15: Reserved 9 = One-bit audio aka SACD10 = DD+11 = DTS-HD12 = MLP/Dolby TrueHD13 = DST Audio14 = Microsoft WMA Probit 2.0: number of channels minus 1 (i.e. 000 = 1 channel; 001 = 2 channels; 111 =8 channels) SAD Byte 2 (sampling frequencies supported):bit 7: Reserved (0)bit 6: 192kHzbit 5: 176kHzbit 4: 96kHzbit 3: 88kHzbit 2: 48kHzbit 1: 44kHzbit 0: 32kHz SAD Byte 3 (bitrate):For LPCM, bits 7:3 are reserved and the remaining bits define bit depthbit 2: 24 bitbit 1: 20 bitbit 0: 16 bitFor all other sound formats, bits 7.0 designate the maximum supported bitrate divided by 8kbps. Any Video Data Block will contain one or more 1-byte Short Video Descriptors (SVDs). They are decoded as follows:bit 7: 1 to designate that this should be considered a native resolution, 0 for non-nativebit 6.0: index value to a table of standard resolutions/timings from CEA/EIA-861E:CodeShort AspectName Ratio HxV F 1 DMT0659 4:3 640x480p 59.94/60Hz2 480p 4:3 720x480p 59.94/60Hz3 480pH 16:9 720x480p 59.94/60Hz4 720p 16:9 1280x720p 59.94/60Hz5 1080i 16:9 1920x1080i 59.94/60Hz6 480i 4:3 720(1440)x480i 59.94/60Hz7 480iH 16:9 720(1440)x480i 59.94/60Hz8 240p 4:3 720(1440)x240p 59.94/60Hz9 240pH 16:9 720(1440)x240p 59.94/60Hz10 480i4x 4:3 (2880)x480i 59.94/60Hz11 480i4xH 16:9 (2880)x480i 59.94/60Hz12 240p4x 4:3 (2880)x240p 59.94/60Hz13 240p4xH 16:9 (2880)x240p 59.94/60Hz14 480p2x 4:3 1440x480p 59.94/60Hz15 480p2xH 16:9 1440x480p 59.94/60Hz16 1080p 16:9 1920x1080p 59.94/60Hz17 576p 4:3 720x576p 50Hz18 576pH 16:9 720x576p 50Hz19 720p50 16:9 1280x720p 50Hz20 1080i25 16:9 1920x1080i 50Hz*21 576i 4:3 720(1440)x576i 50Hz22 576iH 16:9 720(1440)x576i 50Hz23 288p 4:3 720(1440)x288p 50Hz24 288pH 16:9 720(1440)x288p 50Hz25 576i4x 4:3 (2880)x576i 50Hz26 576i4xH 16:9 (2880)x576i 50Hz27 288p4x 4:3 (2880)x288p 50Hz28 288p4xH 16:9 (2880)x288p 50Hz29 576p2x 4:3 1440x576p 50Hz30 576p2xH 16:9 1440x576p 50Hz31 1080p50 16:9 1920x1080p 50Hz32 1080