EDID 1.3 Data Format
| Bytes | Description | |
|---|---|---|
| 0–19 | Header information | |
| 0–7 | Fixed header pattern: 00 FF FF FF FF FF FF 00 |
|
| 8–9 | Manufacturer EISA ID. Encoded as 3 5-bit letters (1=A, 26=Z), big-endian, with msbit reserved. | |
| Bit 15 | (Reserved, always 0) | |
| Bits 14–10 | First letter of manufacturer ID (byte 8, bits 6–2) | |
| Bits 9–5 | Second letter of manufacturer ID (byte 8, bit 1 through byte 9 bit 5) | |
| Bits 4–0 | Third letter of manufacturer ID (byte 9 bits 4–0) | |
| 10–11 | Manufacturer product code. 16-bit number, little-endian. | |
| 12–15 | Serial number. 32 bits, little endian. | |
| 16 | Week of manufacture. Week numbering is not consistent between manufacturers. | |
| 17 | Year of manufacture, less 1990. (1990–2245). If week=255, it is the model year instead. | |
| 18 | EDID version, usually 1 (for 1.3) | |
| 19 | EDID revision, usually 3 (for 1.3) | |
| 20–24 | Basic display parameters. | |
| 20 | Video input parameters bitmap | |
| Bit 7=1 | Digital input. If set, the following bit definitions apply: | |
| Bits 6–1 | Reserved, must be 0 | |
| Bit 0 | Signal is compatible with VESA DFP 1.x TMDS CRGB, 1 pixel per clock, up to 8 bits per color, MSB aligned, | |
| Bit 7=0 | Analog input. If clear, the following bit definitions apply: | |
| Bits 6–5 | Video white and sync levels, relative to blank: 00=+0.7/−0.3 V; 01=+0.714/−0.286 V; 10=+1.0/−0.4 V; 11=+0.7/0 V | |
| Bit 4 | Blank-to-black setup (pedestal) expected | |
| Bit 3 | Separate sync supported | |
| Bit 2 | Composite sync (on HSync) supported | |
| Bit 1 | Sync on green supported | |
| Bit 0 | VSync pulse must be serrated when composite or sync-on-green is used. | |
| 21 | Maximum horizontal image size, in centimetres (max 292 cm/115 in at 16:9 aspect ratio) | |
| 22 | Maximum vertical image size, in centimetres. If either byte is 0, undefined (e.g. projector) | |
| 23 | Display gamma, datavalue = (gamma*100)-100 (range 1.00–3.54) | |
| 24 | Supported features bitmap | |
| Bit 7 | DPMS standby supported | |
| Bit 6 | DPMS suspend supported | |
| Bit 5 | DPMS active-off supported | |
| Bits 4–3 | Display type (digital): 00 = RGB 4:4:4; 01 = RGB 4:4:4 + YCrCb 4:4:4; 10 = RGB 4:4:4 + YCrCb 4:2:2; 11 = RGB 4:4:4 + YCrCb 4:4:4 + YCrCb 4:2:2 | |
| Bits 4-3 | Display type (analog): 00 = Monochrome or Grayscale; 01 = RGB color; 10 = Non-RGB color; 11 = Undefined | |
| Bit 2 | Standard sRGB colour space. Bytes 25–34 must contain sRGB standard values. | |
| Bit 1 | Preferred timing mode specified in descriptor block 1. | |
| Bit 0 | GTF supported with default parameter values. | |
| 25–34 | Chromaticity coordinates. 10-bit CIE xy coordinates for red, green, blue, and white. . |
|
| 25 | Red and green least-significant bits | |
| Bits 7–6 | Red x value least-significant 2 bits | |
| Bits 5–4 | Red y value least-significant 2 bits | |
| Bits 3–2 | Green x value least-significant 2 bits | |
| Bits 1–0 | Green y value least-significant 2 bits | |
| 26 | Blue and white least-significant 2 bits | |
| 27 | Red x value most significant 8 bits. 0–255 encodes 0–0.996 (255/256); 0–0.999 (1023/1024) with lsbits | |
| 28 | Red y value most significant 8 bits | |
| 29–30 | Green x and y value most significant 8 bits | |
| 31–32 | Blue x and y value most significant 8 bits | |
| 33–34 | Default white point x and y value most significant 8 bits | |
| 35–37 | Established timing bitmap. Supported bitmap for very common timing modes. | |
| 35 | Bit 7 | 720×400 @ 70 Hz |
| Bit 6 | 720×400 @ 88 Hz | |
| Bit 5 | 640×480 @ 60 Hz | |
| Bit 4 | 640×480 @ 67 Hz | |
| Bit 3 | 640×480 @ 72 Hz | |
| Bit 2 | 640×480 @ 75 Hz | |
| Bit 1 | 800×600 @ 56 Hz | |
| Bit 0 | 800×600 @ 60 Hz | |
| 36 | Bit 7 | 800×600 @ 72 Hz |
| Bit 6 | 800×600 @ 75 Hz | |
| Bit 5 | 832×624 @ 75 Hz | |
| Bit 4 | 1024×768 @ 87 Hz, interlaced (1024×768i) | |
| Bit 3 | 1024×768 @ 60 Hz | |
| Bit 2 | 1024×768 @ 72 Hz | |
| Bit 1 | 1024×768 @ 75 Hz | |
| Bit 0 | 1280×1024 @ 75 Hz | |
| 37 | Bit 7 | 1152x870 @ 75 Hz (Apple Macintosh II) |
| Bits 6–0 | Other manufacturer-specific display modes | |
| 38–53 | Standard timing information. Up to 8 2-byte fields describing standard display modes. Unused fields are filled with 01 01 |
|
| Byte 0 | X resolution, divided by 8, less 31 (256–2288 pixels, value 00 is reserved and should not be used) | |
| Byte 1 bits 7–6 | X:Y pixel ratio: 00=16:10; 01=4:3; 10=5:4; 11=16:9. (Versions prior to 1.3 defined 00 as 1:1.) |
|
| Byte 1 bits 5–0 | Vertical frequency, less 60 (60–123 Hz) | |
| 54–71 | Descriptor 1 | Descriptor blocks. Detailed timing descriptors, in decreasing preference order. After all detailed timing descriptors, additional descriptors are permitted:
|
| 72–89 | Descriptor 2 | |
| 90–107 | Descriptor 3 | |
| 108–125 | Descriptor 4 | |
| 126 | Number of extensions to follow. 0 if no extensions. | |
| 127 | Checksum. Sum of all 128 bytes should equal 0 (mod 256). | |
| Bytes | Description | |
|---|---|---|
| 0–1 | Pixel clock in 10 kHz units. (0.01–655.35 MHz, little-endian) | |
| 2 | Horizontal active pixels 8 lsbits (0–4095) | |
| 3 | Horizontal blanking pixels 8 lsbits (0–4095) End of active to start of next active. | |
| 4 | Bits 7–4 | Horizontal active pixels 4 msbits |
| Bits 3–0 | Horizontal blanking pixels 4 msbits | |
| 5 | Vertical active lines 8 lsbits (0–4095) | |
| 6 | Vertical blanking lines 8 lsbits (0–4095) | |
| 7 | Bits 7–4 | Vertical active lines 4 msbits |
| Bits 3–0 | Vertical blanking lines 4 msbits | |
| 8 | Horizontal sync offset pixels 8 lsbits (0–1023) From blanking start | |
| 9 | Horizontal sync pulse width pixels 8 lsbits (0–1023) | |
| 10 | Bits 7–4 | Vertical sync offset lines 4 lsbits (0–63) |
| Bits 3–0 | Vertical sync pulse width lines 4 lsbits (0–63) | |
| 11 | Bits 7–6 | Horizontal sync offset pixels 2 msbits |
| Bits 5–4 | Horizontal sync pulse width pixels 2 msbits | |
| Bits 3–2 | Vertical sync offset lines 2 msbits | |
| Bits 1–0 | Vertical sync pulse width lines 2 msbits | |
| 12 | Horizontal display size, mm, 8 lsbits (0–4095 mm, 161 in) | |
| 13 | Vertical display size, mm, 8 lsbits (0–4095 mm, 161 in) | |
| 14 | Bits 7–4 | Horizontal display size, mm, 4 msbits |
| Bits 3–0 | Vertical display size, mm, 4 msbits | |
| 15 | Horizontal border pixels (each side; total is twice this) | |
| 16 | Vertical border lines (each side; total is twice this) | |
| 17 | Features bitmap | |
| Bit 7 | Interlaced | |
| Bits 6–5 | Stereo mode: 00=No stereo; other values depend on bit 0: Bit 0=0: 01=Field sequential, sync=1 during right; 10=similar, sync=1 during left; 11=4-way interleaved stereo Bit 0=1 2-way interleaved stereo: 01=Right image on even lines; 10=Left image on even lines; 11=side-by-side |
|
| Bits 4–3 | Sync type: 00=Analog composite; 01=Bipolar analog composite; 10=Digital composite (on HSync); 11=Digital separate | |
| Bit 2 | If digital separate: Vertical sync polarity (1=positive) Other types: VSync serrated (HSync during VSync) |
|
| Bit 1 | If analog sync: Sync on all 3 RGB lines (else green only) Digital: HSync polarity (1=positive) |
|
| Bit 0 | 2-way line-interleaved stereo, if bits 4–3 are not 00. | |
When used for another descriptor, the pixel clock and some other bytes are set to 0:
| Bytes | Description |
|---|---|
| 0–1 | Zero, indicates not a detailed timing descriptor |
| 2 | Zero |
| 3 | Descriptor type. FA–FF currently defined. 00–0F reserved for vendors. |
| 4 | Zero |
| 5–17 | Defined by descriptor type. If text, code page 437 text, terminated (if less than 13 bytes) with LF and padded with SP. |
Currently defined descriptor types are:
- 0xFF: Monitor serial number (text)
- 0xFE: Unspecified text (text)
- 0xFD: Monitor range limits. 6- or 13-byte binary descriptor.
- 0xFC: Monitor name (text)
- 0xFB: Additional white point data. 2× 5-byte descriptors, padded with
0A 20 20. - 0xFA: Additional standard timing identifiers. 6× 2-byte descriptors, padded with
0A.
| Bytes | Description |
|---|---|
| 0–4 | Standard header, byte 3 = 0xFD. |
| 5 | Minimum vertical field rate (1–255 Hz) |
| 6 | Maximum vertical field rate (1–255 Hz) |
| 7 | Minimum horizontal line rate (1–255 kHz) |
| 8 | Maximum horizontal line rate (1–255 kHz) |
| 9 | Maximum pixel clock rate, rounded up to 10 MHz multiple (10–2550 MHz) |
| 10 | Extended timing information type:00: No information, padded with 0A 20 20 20 20 20 20.02: Secondary GTF supported, parameters as follows. |
| 11 | Reserved, must be 0. |
| 12 | Start frequency for secondary curve, divided by 2 kHz (0–510 kHz) |
| 13 | GTF C value, multiplied by 2 (0–127.5) |
| 14–15 | GTF M value (0–65535, little-endian) |
| 16 | GTF K value (0–255) |
| 17 | GTF J value, multiplied by 2 (0–127.5) |
| Bytes | Description | |
|---|---|---|
| 0–4 | Standard header, byte 3 = 0xFB. | |
| 5 | White point index number (1–255) Usually 1; 0 indicates descriptor not used. | |
| 6 | White point CIE xy coordinates least-significant bits (like EDID byte 26) | |
| Bits 7–4 | Unused, must be 0. | |
| Bits 3–2 | White point x value least-significant 2 bits | |
| Bits 1–0 | White point y value least-significant 2 bits | |
| 7 | White point x value most significant 8 bits (like EDID byte 27) | |
| 8 | White point y value most significant 8 bits (like EDID byte 28) | |
| 9 | datavalue = (gamma*100)-100 (1.0–3.54, like EDID byte 23) | |
| 10–14 | Second descriptor, like above. Index number usually 2. | |
| 15–17 | Unused, padded with 0A 20 20. |
|
Read more about this topic: Extended Display Identification Data
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