Extended Display Identification Data (EDID) and Enhanced EDID (E-EDID) are metadata formats for display devices to describe their capabilities to a video source (e.g., graphics card or set-top box). The data format is defined by a standard published by the Video Electronics Standards Association (VESA).
The EDID data structure includes manufacturer name and serial number, product type, phosphor or filter type (as chromaticity data), timings supported by the display, display size, luminance data and (for digital displays only) pixel mapping data.
DisplayID is a VESA standard targeted to replace EDID and E-EDID extensions with a uniform format suited for both PC monitor and consumer electronics devices.
EDID structure (base block) versions range from v1.0 to v1.4; all these define upwards-compatible 128-byte structures. Version 2.0 defined a new 256-byte structure but it has been deprecated and replaced by E-EDID which supports multiple extension blocks. HDMI versions 1.0–1.3c use E-EDID v1.3.[1]
Before Display Data Channel (DDC) and EDID were defined, there was no standard way for a graphics card to know what kind of display device it was connected to. Some VGA connectors in personal computers provided a basic form of identification by connecting one, two or three pins to ground, but this coding was not standardized.
This problem is solved by EDID and DDC, as it enables the display to send information to the graphics card it is connected to. The transmission of EDID information usually uses the Display Data Channel protocol, specifically DDC2B, which is based on I²C-bus (DDC1 used a different serial format which never gained popularity). The data is transmitted via the cable connecting the display and the graphics card; VGA, DVI, DisplayPort and HDMI are supported.
The EDID is often stored in the monitor in the firmware chip called serial EEPROM (electrically erasable programmable read-only memory) and is accessible via the I²C-bus at address . The EDID PROM can often be read by the host PC even if the display itself is turned off.
Many software packages can read and display the EDID information, such as read-edid[2] for Linux and DOS, PowerStrip[3] for Microsoft Windows and the X.Org Server for Linux and BSD unix. Mac OS X natively reads EDID information and programs such as SwitchResX[4] or DisplayConfigX[5] can display the information as well as use it to define custom resolutions.
E-EDID was introduced at the same time as E-DDC, which supports multiple extensions blocks and deprecated EDID version 2.0 structure (it can be incorporated in E-EDID as an optional extension block). Data fields for preferred timing, range limits, and monitor name are required in E-EDID. E-EDID also adds support for the Dual GTF curve concept and partially changed the encoding of aspect ratio within the standard timings.
With the use of extensions, E-EDID structure can be extended up to 32 KiB, because the E-DDC added the capability to address multiple (up to 128) 256 byte segments.
Some graphics card drivers have historically coped poorly with the EDID, using only its standard timing descriptors rather than its Detailed Timing Descriptors (DTDs). Even in cases where the DTDs were read, the drivers are/were still often limited by the standard timing descriptor limitation that the horizontal/vertical resolutions must be evenly divisible by 8. This means that many graphics cards cannot express the native resolutions of the most common wide screen flat panel displays and liquid crystal display televisions. The number of vertical pixels is calculated from the horizontal resolution and the selected aspect ratio. To be fully expressible, the size of wide screen display must thus be a multiple of 16×9 pixels. For 1366×768 pixel Wide XGA panels the nearest resolution expressible in the EDID standard timing descriptor syntax is 1360×765 pixels, typically leading to 3 pixel thin black bars. Specifying 1368 pixels as the screen width would yield an unnatural screen height of 769.5 pixels.
Many Wide XGA panels do not advertise their native resolution in the standard timing descriptors, instead offering only a resolution of 1280×768. Some panels advertise a resolution only slightly smaller than the native, such as 1360×765. For these panels to be able to show a pixel perfect image, the EDID data must be ignored by the display driver or the driver must correctly interpret the DTD and be able to resolve resolutions whose size is not divisible by 8. Special programs are available to override the standard timing descriptors from EDID data. Even this is not always possible, as some vendors' graphics drivers (notably those of Intel) require specific registry hacks to implement custom resolutions, which can make it very difficult to use the screen's native resolution.[7]
| Description | |||
| 0–19 | Header information | ||
|---|---|---|---|
| 0–7 | Fixed header pattern: 00 FF FF FF FF FF FF 00 | ||
| 8–9 | Manufacturer ID. This is a legacy Plug and Play ID assigned by UEFI forum, which is a big-endian 16-bit value made up of three 5-bit letters: 00001, A; 00010, B; ...; 11010, Z. E.g.: 24 4d,, "IBM"; "PHL" (Philips). | ||
| Bit 15 | = reserved | ||
| 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 hex number, little-endian. For Example, "PHL" + "C0CF". | ||
| 12–15 | Serial number. 32 bits, little-endian. | ||
| 16 | Week of manufacture; or model year flag. Week numbering is not consistent between manufacturers. | ||
| 17 | Year of manufacture, or year of model, if model year flag is set. Year = datavalue + 1990. | ||
| 18 | EDID version, usually (for 1.3 and 1.4) | ||
| 19 | EDID revision, usually (for 1.3) or (for 1.4) | ||
| 20–24 | Basic display parameters | ||
| 20 | Video input parameters bitmap | ||
| Bit 7 = | Digital input. If set, the following bit definitions apply: | ||
| Bits 6–4 | Bit depth: = undefined = 6 = 8 = 10 = 12 = 14 = 16 bits per color = reserved | ||
| Bits 3–0 | Video interface: = undefined = DVI = HDMIa = HDMIb = MDDI = DisplayPort | ||
| Bit 7 = | Analog input. If clear, the following bit definitions apply: | ||
| Bits 6–5 | Video white and sync levels, relative to blank: = +0.7/−0.3 V = +0.714/−0.286 V = +1.0/−0.4 V = +0.7/0 V (EVC) | ||
| 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 | Horizontal screen size, in centimetres (range 1–255). If vertical screen size is 0, landscape aspect ratio (range 1.00–3.54), datavalue = (AR×100) − 99 (example: 16:9, 79; 4:3, 34.) | ||
| 22 | Vertical screen size, in centimetres. If horizontal screen size is 0, portrait aspect ratio (range 0.28–0.99), datavalue = (100/AR) − 99 (example: 9:16, 79; 3:4, 34.) If both bytes are 0, screen size and aspect ratio are undefined (e.g. projector) | ||
| 23 | Display gamma, factory default (range 1.00–3.54), datavalue = (gamma×100) − 100 = (gamma − 1)×100. If 255, gamma is defined by DI-EXT block. | ||
| 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): = RGB 4:4:4 = RGB 4:4:4 + YCrCb 4:4:4 = RGB 4:4:4 + YCrCb 4:2:2 = RGB 4:4:4 + YCrCb 4:4:4 + YCrCb 4:2:2 | ||
| Display type (analog): = monochrome or grayscale = RGB color = non-RGB color = 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. For EDID 1.3+ the preferred timing mode is always in the first Detailed Timing Descriptor. In that case, this bit specifies whether the preferred timing mode includes native pixel format and refresh rate. | ||
| Bit 0 | |||
| 25–34 | Chromaticity coordinates. 10-bit 2° CIE 1931 xy coordinates for red, green, blue, and white point | ||
| 25 | Red and green least-significant bits (2−9, 2−10) | ||
| 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 (2−1, ..., 2−8). 0–255 encodes fractional 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 (formerly) very common timing modes. | ||
| 35 | Bit 7 | 720×400 @ 70 Hz (VGA) | |
| Bit 6 | 720×400 @ 88 Hz (XGA) | ||
| Bit 5 | 640×480 @ 60 Hz (VGA) | ||
| Bit 4 | 640×480 @ 67 Hz (Apple Macintosh II) | ||
| 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 (Apple Macintosh II) | ||
| Bit 4 | 1024×768 @ 87 Hz, interlaced (1024×768i) | ||
| Bit 3 | 1024×768 @ 60 Hz | ||
| Bit 2 | 1024×768 @ 70 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 hex. The following definitions apply in each record: | ||
| 38 | Standard timing 1: X resolution, = reserved; otherwise, (datavalue + 31) × 8 (256–2288 pixels). | ||
| 39 | Bits 7–6 | Standard timing 1: Image aspect ratio: = 16:10 = 4:3 = 5:4 = 16:9 (Versions prior to 1.3 defined as 1:1.) | |
| Bits 5–0 | Vertical frequency, datavalue + 60 (60–123 Hz) | ||
| 40-41 | Standard timing 2 | ||
| 42-43 | Standard timing 3 | ||
| 44-45 | Standard timing 4 | ||
| 46-47 | Standard timing 5 | ||
| 48-49 | Standard timing 6 | ||
| 50-51 | Standard timing 7 | ||
| 52-53 | Standard timing 8 | ||
| 54–125 | Display timing descriptor followed by display/monitor descriptors | ||
| 54–71 | Preferred timing descriptor | 18 byte detailed timing descriptors or display descriptors | |
| 72–89 | Descriptor 2 | ||
| 90–107 | Descriptor 3 | ||
| 108–125 | Descriptor 4 | ||
| 126-127 | Extension flag and checksum | ||
| 126 | Number of extensions to follow. 0 if no extensions. | ||
| 127 | Checksum. Sum of all 128 bytes should equal 0 (mod 256). | ||
| Description | ||
| 0–1 | Pixel clock. = reserved; otherwise in 10 kHz units (0.01–655.35 MHz, little-endian). | |
| 2 | Horizontal active pixels 8 lsbits (0–255) | |
| 3 | Horizontal blanking pixels 8 lsbits (0–255) End of active to start of next active. | |
| 4 | Bits 7–4 | Horizontal active pixels 4 msbits (0–15) |
| Bits 3–0 | Horizontal blanking pixels 4 msbits (0–15) | |
| 5 | Vertical active lines 8 lsbits (0–255) | |
| 6 | Vertical blanking lines 8 lsbits (0–255) | |
| 7 | Bits 7–4 | Vertical active lines 4 msbits (0–15) |
| Bits 3–0 | Vertical blanking lines 4 msbits (0–15) | |
| 8 | Horizontal front porch (sync offset) pixels 8 lsbits (0–255) From blanking start | |
| 9 | Horizontal sync pulse width pixels 8 lsbits (0–255) | |
| 10 | Bits 7–4 | Vertical front porch (sync offset) lines 4 lsbits (0–15) |
| Bits 3–0 | Vertical sync pulse width lines 4 lsbits (0–15) | |
| 11 | Bits 7–6 | Horizontal front porch (sync offset) pixels 2 msbits (0–3) |
| Bits 5–4 | Horizontal sync pulse width pixels 2 msbits (0–3) | |
| Bits 3–2 | Vertical front porch (sync offset) lines 2 msbits (0–3) | |
| Bits 1–0 | Vertical sync pulse width lines 2 msbits (0–3) | |
| 12 | Horizontal image size, mm, 8 lsbits (0–255 mm, 161 in) | |
| 13 | Vertical image size, mm, 8 lsbits (0–255 mm, 161 in) | |
| 14 | Bits 7–4 | Horizontal image size, mm, 4 msbits (0–15) |
| Bits 3–0 | Vertical image size, mm, 4 msbits (0–15) | |
| 15 | Horizontal border pixels (one side; total is twice this) (0–255) | |
| 16 | Vertical border lines (one side; total is twice this) (0–255) | |
| 17 | Features bitmap | |
| Bit 7 | Signal Interface Type: = non-interlaced; = interlaced. | |
| Bits 6–5 | Stereo mode (combine bits 6–5 with bit 0): = none, bit 0 is "don't care"; = field sequential, right during stereo sync; = field sequential, left during stereo sync; = 2-way interleaved, right image on even lines; = 2-way interleaved, left image on even lines; = 4-way interleaved; = side-by-side interleaved. | |
| Bit 4 = | Analog sync. If set, the following bit definitions apply: | |
|---|---|---|
| Bit 3 | Sync type: = analog composite; = bipolar analog composite. | |
| Bit 2 | Serration: = without serrations; = with serrations (H-sync during V-sync). | |
| Bit 1 | Sync on red and blue lines additionally to green = sync on green signal only; = sync on all three (RGB) video signals. | |
| Bits 4–3 = | Digital sync., composite (on HSync). If set, the following bit definitions apply: | |
| Bit 2 | Serration = without serration; = with serration (H-sync during V-sync). | |
| Bit 1 | Horizontal sync polarity: = negative; = positive. | |
| Bits 4–3 = | Digital sync., separate If set, the following bit definitions apply: | |
| Bit 2 | Vertical sync polarity: = negative; = positive. | |
| Bit 1 | Horizontal sync polarity: = negative; = positive. | |
| Bit 0 | Stereo mode (combines with bits 6–5) | |
When used for another descriptor, the pixel clock and some other bytes are set to 0:
| Description | ||
| 0–1 | = Monitor Descriptor (cf. Detailed Timing Descriptor). | |
| 2 | = reserved | |
| 3 | Descriptor type. FA–FF currently defined. 00–0F reserved for vendors. | |
| 4 | = reserved, except for Display Range Limits Descriptor. | |
| 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:
0A 20 20.0A.| Description | |||
| 0–1 | = Display Descriptor | ||
| 2 | = reserved | ||
| 3 | = Display Range Limits Descriptor | ||
| 4 | Offsets for display range limits | ||
| Bits 7–4 | = reserved | ||
| Bits 3–2 | Horizontal rate offsets: = none; = +255 kHz for max. rate; = +255 kHz for max. and min. rates. | ||
| Bits 1–0 | Vertical rate offsets: = none; = +255 Hz for max. rate; = +255 Hz for max. and min. rates. | ||
| 5 | Minimum | vertical field rate (1–255 Hz; 256–510 Hz, if offset). | |
| 6 | Maximum | ||
| 7 | Minimum | horizontal line rate (1–255 kHz; 256–510 kHz, if offset). | |
| 8 | Maximum | ||
| 9 | Maximum pixel clock rate, rounded up to 10 MHz multiple (10–2550 MHz). | ||
| 10 | Extended timing information type:00 = Default GTF (when basic display parameters byte 24, bit 0 is set).01 = No timing information.02 = Secondary GTF supported, parameters as follows.04 = CVT (when basic display parameters byte 24, bit 0 is set), parameters as follows. | ||
| 11–17 | Video timing parameters (if byte 10 is 00 or 01, padded with 0A 20 20 20 20 20 20). | ||
| Description | ||
| 10 | 02 | |
| 11 | = reserved | |
| 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) | |
| Description | |||
| 10 | 04 | ||
| 11 | Bits 7–4 | CVT major version (1–15) | |
| Bits 3–0 | CVT minor version (0–15) | ||
| 12 | Bits 7–2 | Additional clock precision in 0.25 MHz increments (to be subtracted from byte 9 maximum pixel clock rate) | |
| Bits 1–0 | Maximum active pixels per line, 2-bit msb | ||
| 13 | Maximum active pixels per line, 8-bit lsb (no limit if) | ||
| 14 | Aspect ratio bitmap | ||
| Bit 7 | |||
| Bit 6 | |||
| Bit 5 | |||
| Bit 4 | |||
| Bit 3 | |||
| Bits 2–0 | = reserved | ||
| 15 | Bits 7–5 | Aspect ratio preference: = = = = = | |
| Bit 4 | CVT-RB reduced blanking (preferred) | ||
| Bit 3 | CVT standard blanking | ||
| Bits 2–0 | = reserved | ||
| 16 | Scaling support bitmap | ||
| Bit 7 | Horizontal shrink | ||
| Bit 6 | Horizontal stretch | ||
| Bit 5 | Vertical shrink | ||
| Bit 4 | Vertical stretch | ||
| Bits 3–0 | = reserved | ||
| 17 | Preferred vertical refresh rate (1–255) | ||
| Description | |||
| 0–4 | |||
| 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 | = reserved | ||
| 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 − 1)×100 (1.0–3.54, like EDID byte 23) | ||
| 10–14 | Second descriptor. Index number starts with 2; if = unused | ||
| 15–17 | Unused, padded with 0A 20 20. | ||
| Description | ||
| 0–4 | ||
| 5 | Version: 03 | |
| 6 | Red a3 lsb | |
| 7 | Red a3 msb | |
| 8 | Red a2 lsb | |
| 9 | Red a2 msb | |
| 10 | Green a3 lsb | |
| 11 | Green a3 msb | |
| 12 | Green a2 lsb | |
| 13 | Green a2 msb | |
| 14 | Blue a3 lsb | |
| 15 | Blue a3 msb | |
| 16 | Blue a2 lsb | |
| 17 | Blue a2 msb |
| Description | |||
| 0–4 | |||
| 5 | Version: 01 | ||
| 6-8 | CVT timing descriptor #1 | ||
|---|---|---|---|
| 6 | Addressable lines per field 8-bit lsb | ||
| 7 | Bits 7–4 | Addressable lines per field 4-bit msb | |
| Bits 3–2 | Aspect ratio: = = = = | ||
| Bits 1–0 | = reserved | ||
| 8 | Bit 7 | = reserved | |
| Bits 6–5 | Preferred vertical rate: 50 Hz 60 Hz 75 Hz 85 Hz | ||
| Vertical rate bitmap | |||
| Bit 4 | 50 Hz CVT | ||
| Bit 3 | 60 Hz CVT | ||
| Bit 2 | 75 Hz CVT | ||
| Bit 1 | 85 Hz CVT | ||
| Bit 0 | 60 Hz CVT reduced blanking | ||
| 9–11 | CVT timing descriptor #2 | ||
| 12–14 | CVT timing descriptor #3 | ||
| 15–17 | CVT timing descriptor #4 | ||
Vertical lines=(Addressable lines per field+1)*2
Horizontal pixels=\lfloorVertical lines*Aspect ratio/8\rfloor*8
| Description | ||||
| 0–4 | ||||
| 5 | Version: | |||
| 6 | Bit 7 | 640×350 | @ 85 Hz | |
| Bit 6 | 640×400 | |||
| Bit 5 | 720×400 | |||
| Bit 4 | 640×480 | |||
| Bit 3 | 848×480 | @ 60 Hz | ||
| Bit 2 | 800×600 | @ 85 Hz | ||
| Bit 1 | 1024×768 | |||
| Bit 0 | 1152×864 | |||
| 7 | Bit 7 | 1280×768 | @ 60 Hz (CVT-RB) | |
| Bit 6 | @ 60 Hz | |||
| Bit 5 | @ 75 Hz | |||
| Bit 4 | @ 85 Hz | |||
| Bit 3 | 1280×960 | @ 60 Hz | ||
| Bit 2 | @ 85 Hz | |||
| Bit 1 | 1280×1024 | @ 60 Hz | ||
| Bit 0 | @ 85 Hz | |||
| 8 | Bit 7 | 1360×768 | @ 60 Hz (CVT-RB) | |
| Bit 6 | 1280×768 | @ 60 Hz | ||
| Bit 5 | 1440×900 | @ 60 Hz (CVT-RB) | ||
| Bit 4 | @ 75 Hz | |||
| Bit 3 | @ 85 Hz | |||
| Bit 2 | 1400×1050 | @ 60 Hz (CVT-RB) | ||
| Bit 1 | @ 60 Hz | |||
| Bit 0 | @ 75 Hz | |||
| 9 | Bit 7 | @ 85 Hz | ||
| Bit 6 | 1680×1050 | @ 60 Hz (CVT-RB) | ||
| Bit 5 | @ 60 Hz | |||
| Bit 4 | @ 75 Hz | |||
| Bit 3 | @ 85 Hz | |||
| Bit 2 | 1600×1200 | @ 60 Hz | ||
| Bit 1 | @ 65 Hz | |||
| Bit 0 | @ 70 Hz | |||
| 10 | Bit 7 | @ 75 Hz | ||
| Bit 6 | @ 85 Hz | |||
| Bit 5 | 1792×1344 | @ 60 Hz | ||
| Bit 4 | @ 75 Hz | |||
| Bit 3 | 1856×1392 | @ 60 Hz | ||
| Bit 2 | @ 75 Hz | |||
| Bit 1 | 1920×1200 | @ 60 Hz (CVT-RB) | ||
| Bit 0 | @ 60 Hz | |||
| 11 | Bit 7 | @ 75 Hz | ||
| Bit 6 | @ 85 Hz | |||
| Bit 5 | 1920×1440 | @ 60 Hz | ||
| Bit 4 | @ 75 Hz | |||
| Bits 3–0 | = reserved | |||
| 12–17 | Unused, must be . | |||
The CTA EDID Extension was first introduced in EIA/CEA-861.
The ANSI/CTA-861 industry standard, which according to CTA is now their "Most Popular Standard",[8] has since been updated several times, most notably with the 861-B revision (published in May 2002, which added version 3 of the extension, adding Short Video Descriptors and advanced audio capability/configuration information), 861-D (published in July 2006 and containing updates to the audio segments), 861-E in March 2008,[9] 861-F, which was published on June 4, 2013,[10] 861-H in December 2020,[11] and, most recently, 861-I, which was published in February 2023.[12] Coinciding with the publication of CEA-861-F in 2013, Brian Markwalter, senior vice president, research and standards, stated: "The new edition includes a number of noteworthy enhancements, including support for several new Ultra HD and widescreen video formats and additional colorimetry schemes.”[13]
Version CTA-861-G,[14] originally published in November 2016, was made available for free in November 2017, along with updated versions -E and -F, after some necessary changes due to a trademark complaint. All CTA standards are free to everyone since May 2018.[15] [16]
The most recent full version is CTA-861-I,[17] published in February 2023, available for free after registration. It combines the previous version, CTA-861-H,[18] from January 2021 with an amendment, CTA-861.6,[19] published in February 2022 and includes a new formula to calculate Video Timing Formats, OVT.[20] Other changes include a new annex to elaborate on the audio speaker room configuration system that was introduced with the 861.2 amendment, and some general clarifications and formatting cleanup.
An amendment to CTA-861-I, CTA-861.7,[21] was published in June 2024. It contains updates to CTA 3D Audio, and clarifications on Content Type Indication, and on 4:2:0 support for VTDBs and VFDBs. It also introduces a new Product ID Data Block, to replace the Manufacturer PNP ID in the first block of the EDID, since the UEFI is phasing out assigning new PNP IDs.
Version 1 of the extension block (as defined in CEA−861) allowed the specification of video timings only through the use of 18-byte Detailed Timing Descriptors (DTD) (as detailed in EDID 1.3 data format above). DTD timings are listed in order of preference in the CEA EDID Timing Extension.
Version 2 (as defined in 861-A) added the capability to designate a number of DTDs as "native" (i.e., matching the resolution of the display) and also included some "basic discovery" functionality for whether the display device contains support for "basic audio", YCBCR pixel formats, and underscan.
Version 3 (from the 861-B spec onward) allows two different ways to specify digital video timing formats: As in Version 1 & 2 by the use of 18-byte DTDs, or by the use of the Short Video Descriptor (SVD) (see below). HDMI 1.0–1.3c uses this version.
Version 3 also defines a format for a collection of data blocks, which in turn can contain a number of individual descriptors. This Data Block Collection (DBC) initially had four types of Data Blocks (DBs): Video Data Blocks containing the aforementioned Short Video Descriptor (SVD), Audio Data Blocks containing Short Audio Descriptors (SAD), Speaker Allocation Data Blocks containing information about the speaker configuration of the display device, and Vendor Specific Data Blocks which can contain information specific to a given vendor's use. Subsequent versions of CTA-861 defined additional data blocks.
| Byte | Description | ||
|---|---|---|---|
| 0 | Extension tag (which kind of extension block this is); for CTA EDID | ||
| 1 | Revision number (version number); for version 3 | ||
| 2 | Byte number (decimal) 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 (the byte after next). If set to, there are no DTDs present in this block and no non-DTD data. | ||
| 3 | With version 2 and up: number of Native DTDs present, other information. Reserved with earlier versions. | ||
| Bit 7 | if display supports underscan, if not | ||
| Bit 6 | if display supports basic audio, if not | ||
| Bit 5 | if display supports YCBCR 444, if not | ||
| Bit 4 | if display supports YCBCR 422, if not | ||
| Bit 3–0 | Total number of native formats in the DTDs included in this block | ||
| 4–126 | With version 3 and up: Data Block Collection, starting at byte 4, ending immediately before the byte specified in byte 2. If byte 2 is, the collection is of zero length (i.e. not present). If byte 2 is, no DTDs are present and the DBC takes up the entire remaining EDID block ahead of the checksum. Reserved with earlier versions. | ||
| 18-byte descriptors, starting at the byte specified in byte 2 (if non-zero). Consecutive descriptors are present while the bytes 0–1 of each are not . | |||
| Padding, from the absence of an 18-byte descriptor onwards; must be . | |||
| 127 | Checksum. Value such that the one-byte sum of all 128 bytes is . | ||
The Data Block Collection contains one or more data blocks detailing video, audio, and speaker placement information about the display. The blocks can be placed in any order, and the initial byte of each block defines both its type and its length:
| Byte | Description | |
|---|---|---|
| 0 | Bit 7–5 | Block Type Tag
|
| Bit 4–0 | Total number of bytes in this block following this byte. | |
If the Tag code is 7, an Extended Tag Code is present in the first payload byte of the data block, and the second payload byte represents the first payload byte of the extended data block.
Once one data block has ended, the next byte is assumed to be the beginning of the next data block. This is the case until the byte (designated in byte 2, above) where the DTDs are known to begin.
As noted, several data blocks are defined by the extension.
The Video Data Blocks will contain one or more 1-byte Short Video Descriptors (SVDs).
| Byte | Description | |
|---|---|---|
| 0 | Data block header | |
| 1 | Bit 7 | 1 to designate that this should be considered a "native" resolution, 0 for non-native. Used for 7-bit VICs 1 – 64 only, otherwise this is the for the 8-bit VIC. |
| Bit 6–0 | Index value to a table of standard resolutions/timings from EIA/CEA-861: | |
| Short name | Aspect ratio | Clock | Active | Total | Field rate (Hz) | |||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Pixel (MHz) | H | V | H | V | ||||||||
| 1 | DMT0659 | 25.175 | 59.94 | 31.469 | 640 | 480 | 800 | 525 | 60 | |||
| 2 | 480p | 27 | 59.94 | 31.469 | 720 | 480 | 858 | 525 | 60 | |||
| 3 | 480pH | 27 | 59.94 | 31.469 | 720 | 480 | 858 | 525 | 60 | |||
| 4 | 720p | 74.25 | 60 | 45.0 | 1280 | 720 | 1650 | 750 | 60 | |||
| 5 | 1080i | 74.25 | 60 | 33.75 | 1920 | 540 | 2200 | 562.5 | 60 | |||
| 6 | 480i | 27 | 59.94 | 15.734 | 1440 | 240 | 1716 | 262.5 | 60 | |||
| 7 | 480iH | 27 | 59.94 | 15.734 | 1440 | 240 | 1716 | 262.5 | 60 | |||
| 8 | 240p | 27 | 59.826 | 15.734 | 1440 | 240 | 1716 | 262.5 | 60 | |||
| 9 | 240pH | 27 | 59.826 | 15.734 | 1440 | 240 | 1716 | 262.5 | 60 | |||
| 10 | 480i4x | 2:9-20:9 | 54 | 59.94 | 15.734 | 2880 | 240 | 3432 | 262.5 | 60 | ||
| 11 | 480i4xH | 8:27-80:27 | 54 | 59.94 | 15.734 | 2880 | 240 | 3432 | 262.5 | 60 | ||
| 12 | 240p4x | 1:9-10:9 | 54 | 60 | 15.734 | 2880 | 240 | 3432 | 262.5 | 60 | ||
| 13 | 240p4xH | 4:27-40:27 | 54 | 60 | 15.734 | 2880 | 240 | 3432 | 262.5 | 60 | ||
| 14 | 480p2x | 4:9, | 54 | 59.94 | 31.469 | 1440 | 480 | 1716 | 525 | 60 | ||
| 15 | 480p2xH | 16:27, | 54 | 59.94 | 31.469 | 1440 | 480 | 1716 | 525 | 60 | ||
| 16 | 1080p | 148.5 | 60 | 67.5 | 1920 | 1080 | 2200 | 1125 | 60 | |||
| 17 | 576p | 27 | 50 | 31.25 | 720 | 576 | 864 | 625 | 50 | |||
| 18 | 576pH | 27 | 50 | 31.25 | 720 | 576 | 864 | 625 | 50 | |||
| 19 | 720p50 | 74.25 | 50 | 37.5 | 1280 | 720 | 1980 | 750 | 50 | |||
| 20 | 1080i25 | 74.25 | 50 | 28.125 | 1920 | 540 | 2640 | 562.5 | 50 | |||
| 21 | 576i | 27 | 50 | 15.625 | 1440 | 288 | 1728 | 312.5 | 50 | |||
| 22 | 576iH | 27 | 50 | 15.625 | 1440 | 288 | 1728 | 312.5 | 50 | |||
| 23 | 288p | 27 | 50 | 15.625 | 1440 | 288 | 1728 | 313 | 50 | |||
| 24 | 288pH | 27 | 50 | 15.625 | 1440 | 288 | 1728 | 313 | 50 | |||
| 25 | 576i4x | 2:15-20:15 | 54 | 50 | 15.625 | 2880 | 288 | 3456 | 312.5 | 50 | ||
| 26 | 576i4xH | 16:45-160:45 | 54 | 50 | 15.625 | 2880 | 288 | 3456 | 312.5 | 50 | ||
| 27 | 288p4x | 1:15-10:15 | 54 | 50 | 15.625 | 2880 | 288 | 3456 | 313 | 50 | ||
| 28 | 288p4xH | 8:45-80:45 | 54 | 50 | 15.625 | 2880 | 288 | 3456 | 313 | 50 | ||
| 29 | 576p2x | 8:15, | 54 | 50 | 31.25 | 1440 | 576 | 1728 | 625 | 50 | ||
| 30 | 576p2xH | 32:45, | 54 | 50 | 31.25 | 1440 | 576 | 1728 | 625 | 50 | ||
| 31 | 1080p50 | 148.5 | 50 | 56.25 | 1920 | 1080 | 2640 | 1125 | 50 | |||
| 32 | 1080p24 | 74.25 | 23.98/24 | 27 | 1920 | 1080 | 2750 | 1125 | Low | |||
| 33 | 1080p25 | 74.25 | 25 | 28.125 | 1920 | 1080 | 2640 | 1125 | Low | |||
| 34 | 1080p30 | 74.25 | 29.97/30 | 33.75 | 1920 | 1080 | 2200 | 1125 | Low | |||
| 35 | 480p4x | 2:9, 4:9, | 108 | 59.94 | 31.469 | 2880 | 240 | 3432 | 262.5 | 60 | ||
| 36 | 480p4xH | 8:27, 16:27, | 108 | 59.94 | 31.469 | 2880 | 240 | 3432 | 262.5 | 60 | ||
| 37 | 576p4x | 4:15, 8:15, | 108 | 50 | 31.25 | 2880 | 576 | 3456 | 625 | 50 | ||
| 38 | 576p4xH | 16:45, 32:45, | 108 | 50 | 31.25 | 2880 | 576 | 3456 | 625 | 50 | ||
| 39 | 1080i25 | 72 | 50 | 31.25 | 1920 | 540 | 2304 | 625 | 50 | |||
| 40 | 1080i50 | 148.5 | 100 | 56.25 | 1920 | 540 | 2640 | 562.5 | 100 | |||
| 41 | 720p100 | 148.5 | 100 | 45.0 | 1280 | 720 | 1980 | 750 | 100 | |||
| 42 | 576p100 | 54 | 100 | 62.5 | 720 | 576 | 864 | 625 | 100 | |||
| 43 | 576p100H | 54 | 100 | 62.5 | 720 | 576 | 864 | 625 | 100 | |||
| 44 | 576i50 | 54 | 100 | 31.25 | 1440 | 576 | 1728 | 625 | 100 | |||
| 45 | 576i50H | 54 | 100 | 31.25 | 1440 | 576 | 1728 | 625 | 100 | |||
| 46 | 1080i60 | 148.5 | 119.88/120 | 67.5 | 1920 | 540 | 2200 | 562.5 | 120 | |||
| 47 | 720p120 | 148.5 | 119.88/120 | 90.0 | 1280 | 720 | 1650 | 750 | 120 | |||
| 48 | 480p119 | 54 | 119.88/120 | 62.937 | 720 | 480 | 858 | 525 | 120 | |||
| 49 | 480p119H | 54 | 119.88/120 | 62.937 | 720 | 480 | 858 | 525 | 120 | |||
| 50 | 480i59 | 54 | 119.88/120 | 31.469 | 1440 | 480 | 1716 | 525 | 120 | |||
| 51 | 480i59H | 54 | 119.88/120 | 31.469 | 1440 | 480 | 1716 | 525 | 120 | |||
| 52 | 576p200 | 108 | 200 | 125.0 | 720 | 576 | 864 | 625 | 200 | |||
| 53 | 576p200H | 108 | 200 | 125.0 | 720 | 576 | 864 | 625 | 200 | |||
| 54 | 576i100 | 108 | 200 | 62.5 | 1440 | 288 | 1728 | 312.5 | 200 | |||
| 55 | 576i100H | 108 | 200 | 62.5 | 1440 | 288 | 1728 | 312.5 | 200 | |||
| 56 | 480p239 | 108 | 239.76 | 125.874 | 720 | 480 | 858 | 525 | 240 | |||
| 57 | 480p239H | 108 | 239.76 | 125.874 | 720 | 480 | 858 | 525 | 240 | |||
| 58 | 480i119 | 108 | 239.76 | 62.937 | 1440 | 240 | 1716 | 262.5 | 240 | |||
| 59 | 480i119H | 108 | 239.76 | 62.937 | 1440 | 240 | 1716 | 262.5 | 240 | |||
| 60 | 720p24 | 59.4 | 23.98/24 | 18.0 | 1280 | 720 | 3300 | 750 | Low | |||
| 61 | 720p25 | 74.25 | 25 | 18.75 | 1280 | 720 | 3960 | 750 | Low | |||
| 62 | 720p30 | 74.25 | 29.97/30 | 22.5 | 1280 | 720 | 3300 | 750 | Low | |||
| 63 | 1080p120 | 297 | 119.88/120 | 135.0 | 1920 | 1080 | 2200 | 1125 | 120 | |||
| 64 | 1080p100 | 297 | 100 | 112.5 | 1920 | 1080 | 2640 | 1125 | 100 | |||
| 65 | 720p24 | 59.4 | 23.98/24 | 18.0 | 1280 | 720 | 3300 | 750 | Low | |||
| 66 | 720p25 | 74.25 | 25 | 18.75 | 1280 | 720 | 3960 | 750 | Low | |||
| 67 | 720p30 | 74.25 | 29.97/30 | 22.5 | 1280 | 720 | 3300 | 750 | Low | |||
| 68 | 720p50 | 74.25 | 50 | 37.5 | 1280 | 720 | 1980 | 750 | 50 | |||
| 69 | 720p | 74.25 | 60 | 45.0 | 1650 | 750 | 1650 | 750 | 60 | |||
| 70 | 720p100 | 148.5 | 100 | 75.0 | 1280 | 720 | 1980 | 750 | 100 | |||
| 71 | 720p120 | 148.5 | 119.88/120 | 90.0 | 1280 | 720 | 1650 | 750 | 120 | |||
| 72 | 1080p24 | 74.25 | 23.98/24 | 27 | 1920 | 1080 | 2750 | 1125 | Low | |||
| 73 | 1080p25 | 74.25 | 25 | 28.125 | 1920 | 1080 | 2640 | 1125 | Low | |||
| 74 | 1080p30 | 74.25 | 29.97/30 | 33.75 | 1920 | 1080 | 2200 | 1125 | Low | |||
| 75 | 1080p50 | 148.5 | 50 | 56.25 | 1920 | 1080 | 2640 | 1125 | 50 | |||
| 76 | 1080p | 148.5 | 60 | 67.5 | 1920 | 1080 | 2200 | 1125 | 60 | |||
| 77 | 1080p100 | 297.0 | 100 | 112.5 | 1920 | 1080 | 2640 | 1125 | 100 | |||
| 78 | 1080p120 | 297.0 | 119.88/120 | 135.0 | 1920 | 1080 | 2200 | 1125 | 120 | |||
| 79 | 720p2x24 | 59.4 | 23.98/24 | 18.0 | 1680 | 720 | 3300 | 750 | Low | |||
| 80 | 720p2x25 | 59.4 | 25 | 18.75 | 1680 | 720 | 3168 | 750 | Low | |||
| 81 | 720p2x30 | 59.4 | 29.97/30 | 22.5 | 1680 | 720 | 2640 | 750 | Low | |||
| 82 | 720p2x50 | 82.5 | 50 | 37.5 | 1680 | 720 | 2200 | 750 | 50 | |||
| 83 | 720p2x | 99 | 60 | 45.0 | 1680 | 720 | 2200 | 750 | 60 | |||
| 84 | 720p2x100 | 165 | 100 | 82.5 | 1680 | 720 | 2000 | 825 | 100 | |||
| 85 | 720p2x120 | 198 | 119.88/120 | 99.0 | 1680 | 720 | 2000 | 825 | 120 | |||
| 86 | 1080p2x24 | 99 | 23.98/24 | 26.4 | 2560 | 1080 | 3750 | 1100 | Low | |||
| 87 | 1080p2x25 | 90 | 25 | 28.125 | 2560 | 1080 | 3200 | 1125 | Low | |||
| 88 | 1080p2x30 | 118.8 | 29.97/30 | 33.75 | 2560 | 1080 | 3520 | 1125 | Low | |||
| 89 | 1080p2x50 | 185.625 | 50 | 56.25 | 2560 | 1080 | 3000 | 1125 | 50 | |||
| 90 | 1080p2x | 198 | 60 | 66.0 | 2560 | 1080 | 3000 | 1100 | 60 | |||
| 91 | 1080p2x100 | 371.25 | 100 | 125.0 | 2560 | 1080 | 2970 | 1250 | 100 | |||
| 92 | 1080p2x120 | 495 | 119.88/120 | 150.0 | 2560 | 1080 | 3300 | 1250 | 120 | |||
| 93 | 2160p24 | 297 | 23.98/24 | 54 | 3840 | 2160 | 5500 | 2250 | Low | |||
| 94 | 2160p25 | 297 | 25 | 56.25 | 3840 | 2160 | 5280 | 2250 | Low | |||
| 95 | 2160p30 | 297 | 29.97/30 | 67.5 | 3840 | 2160 | 4400 | 2250 | Low | |||
| 96 | 2160p50 | 594 | 50 | 112.5 | 3840 | 2160 | 5280 | 2250 | 50 | |||
| 97 | 2160p60 | 594 | 60 | 135.0 | 3840 | 2160 | 4400 | 2250 | 60 | |||
| 98 | 2160p24 | 297 | 23.98/24 | 67.5 | 4096 | 2160 | 5500 | 2250 | Low | |||
| 99 | 2160p25 | 297 | 25 | 112.5 | 4096 | 2160 | 5280 | 2250 | Low | |||
| 100 | 2160p30 | 297 | 29.97/30 | 135.0 | 4096 | 2160 | 4400 | 2250 | Low | |||
| 101 | 2160p50 | 594 | 50 | 112.5 | 4096 | 2160 | 5280 | 2250 | 50 | |||
| 102 | 2160p | 594 | 60 | 135.0 | 4096 | 2160 | 4400 | 2250 | 60 | |||
| 103 | 2160p24 | 297 | 23.98/24 | 67.5 | 3840 | 2160 | 5500 | 2250 | Low | |||
| 104 | 2160p25 | 297 | 25 | 112.5 | 3840 | 2160 | 5280 | 2250 | Low | |||
| 105 | 2160p30 | 297 | 29.97/30 | 135.0 | 3840 | 2160 | 4400 | 2250 | Low | |||
| 106 | 2160p50 | 594 | 50 | 112.5 | 3840 | 2160 | 5280 | 2250 | 50 | |||
| 107 | 2160p | 594 | 60 | 135.0 | 3840 | 2160 | 4400 | 2250 | 60 | |||
| 108 | 720p48 | 90 | 47.96/48 | 36.0 | 1280 | 720 | 2500 | 750 | Low | |||
| 109 | 720p48 | 90 | 47.96/48 | 36.0 | 1280 | 720 | 2500 | 750 | Low | |||
| 110 | 720p2x48 | 99 | 47.96/48 | 36.0 | 1680 | 720 | 2750 | 825 | Low | |||
| 111 | 1080p48 | 148.5 | 47.96/48 | 54 | 1920 | 1080 | 2750 | 1125 | Low | |||
| 112 | 1080p48 | 148.5 | 47.96/48 | 54 | 1920 | 1080 | 2750 | 1125 | Low | |||
| 113 | 1080p2x48 | 198 | 47.96/48 | 52.8 | 2560 | 1080 | 3750 | 1100 | Low | |||
| 114 | 2160p48 | 594 | 47.96/48 | 108 | 3840 | 2160 | 5500 | 2250 | Low | |||
| 115 | 2160p48 | 594 | 47.96/48 | 108 | 4096 | 2160 | 5500 | 2250 | Low | |||
| 116 | 2160p48 | 594 | 47.96/48 | 108 | 3840 | 2160 | 5500 | 2250 | Low | |||
| 117 | 2160p100 | 1188 | 100 | 225.0 | 3840 | 2160 | 5280 | 2250 | 100 | |||
| 118 | 2160p120 | 1188 | 119.88/120 | 270.0 | 3840 | 2160 | 4400 | 2250 | 120 | |||
| 119 | 2160p100 | 1188 | 100 | 225.0 | 3840 | 2160 | 5280 | 2250 | 100 | |||
| 120 | 2160p120 | 1188 | 119.88/120 | 270.0 | 3840 | 2160 | 4400 | 2250 | 120 | |||
| 121 | 2160p2x24 | 396 | 23.98/24 | 52.8 | 5120 | 2160 | 7500 | 2200 | Low | |||
| 122 | 2160p2x25 | 396 | 25 | 55.0 | 5120 | 2160 | 7200 | 2200 | Low | |||
| 123 | 2160p2x30 | 396 | 29.97/30 | 66.0 | 5120 | 2160 | 6000 | 2200 | Low | |||
| 124 | 2160p2x48 | 742.5 | 47.96/48 | 118.8 | 5120 | 2160 | 6250 | 2450 | Low | |||
| 125 | 2160p2x50 | 742.5 | 50 | 112.5 | 5120 | 2160 | 6600 | 2250 | 50 | |||
| 126 | 2160p2x | 742.5 | 60 | 135.0 | 5120 | 2160 | 5500 | 2250 | 60 | |||
| 127 | 2160p2x100 | 1485 | 100 | 225.0 | 5120 | 2160 | 6600 | 2250 | 100 | |||
| 128—192 | reserved, value range is used in SVD to indicate native timing for numbers 1—64. | |||||||||||
| 193 | 2160p2x120 | 1485.0 | 119.88/120 | 270 | 5120 | 2160 | 5500 | 2250 | 120 | |||
| 194 | 4320p24 | 1188.0 | 23.98/24 | 108 | 7680 | 4320 | 11000 | 4500 | Low | |||
| 195 | 4320p25 | 1188.0 | 25 | 110 | 7680 | 4320 | 10800 | 4400 | Low | |||
| 196 | 4320p30 | 1188.0 | 29.97/30 | 132 | 7680 | 4320 | 9000 | 4400 | Low | |||
| 197 | 4320p48 | 2376.0 | 47.96/48 | 216 | 7680 | 4320 | 11000 | 4500 | Low | |||
| 198 | 4320p50 | 2376.0 | 50 | 220 | 7680 | 4320 | 10800 | 4400 | 50 | |||
| 199 | 4320p | 2376.0 | 60 | 264 | 7680 | 4320 | 9000 | 4400 | 60 | |||
| 200 | 4320p100 | 4752.0 | 100 | 450 | 7680 | 4320 | 10560 | 4500 | 100 | |||
| 201 | 4320p120 | 4752.0 | 119.88/120 | 540 | 7680 | 4320 | 8800 | 4500 | 120 | |||
| 202 | 4320p24 | 1188.0 | 23.98/24 | 108 | 7680 | 4320 | 11000 | 4500 | Low | |||
| 203 | 4320p25 | 1188.0 | 25 | 110 | 7680 | 4320 | 10800 | 4400 | Low | |||
| 204 | 4320p30 | 1188.0 | 29.97/30 | 132 | 7680 | 4320 | 9000 | 4400 | Low | |||
| 205 | 4320p48 | 2376.0 | 47.96/48 | 216 | 7680 | 4320 | 11000 | 4500 | Low | |||
| 206 | 4320p50 | 2376.0 | 50 | 220 | 7680 | 4320 | 10800 | 4400 | 50 | |||
| 207 | 4320p | 2376.0 | 60 | 264 | 7680 | 4320 | 9000 | 4400 | 60 | |||
| 208 | 4320p100 | 4752.0 | 100 | 450 | 7680 | 4320 | 10560 | 4500 | 100 | |||
| 209 | 4320p120 | 4752.0 | 119.88/120 | 540 | 7680 | 4320 | 8800 | 4500 | 120 | |||
| 210 | 4320p2x24 | 1485.0 | 23.98/24 | 118.8 | 10240 | 4320 | 12500 | 4950 | Low | |||
| 211 | 4320p2x25 | 1485.0 | 25 | 110 | 10240 | 4320 | 13500 | 4400 | Low | |||
| 212 | 4320p2x30 | 1485.0 | 29.97/30 | 135 | 10240 | 4320 | 11000 | 4500 | Low | |||
| 213 | 4320p2x48 | 2970.0 | 47.96/48 | 237.6 | 10240 | 4320 | 12500 | 4950 | Low | |||
| 214 | 4320p2x50 | 2970.0 | 50 | 220 | 10240 | 4320 | 13500 | 4400 | 50 | |||
| 215 | 4320p2x | 2970.0 | 60 | 270 | 10240 | 4320 | 11000 | 4400 | 60 | |||
| 216 | 4320p2x100 | 5940.0 | 100 | 450 | 10240 | 4320 | 13200 | 4500 | 100 | |||
| 217 | 4320p2x120 | 5940.0 | 119.88/120 | 540 | 10240 | 4320 | 11000 | 4500 | 120 | |||
| 218 | 2160p100 | 1188.0 | 100 | 225 | 4096 | 2160 | 5280 | 2250 | 100 | |||
| 219 | 2160p120 | 1188.0 | 119.88/120 | 270 | 4096 | 2160 | 4400 | 2250 | 120 | |||
Notes: Parentheses indicate instances where pixels are repeated to meet the minimum speed requirements of the interface. For example, in the 720x240p case, the pixels on each line are double-clocked. In the (2880)x480i case, the number of pixels on each line, and thus the number of times that they are repeated, is variable, and is sent to the DTV monitor by the source device.
Increased Hactive expressions include “2x” and “4x” indicate two and four times the reference resolution, respectively.
Video modes with vertical refresh frequency being a multiple of 6Hz (i.e. 24, 30, 60, 120, and 240Hz) are considered to be the same timing as equivalent NTSC modes where vertical refresh is adjusted by a factor of 1000/1001. As VESA DMT specifies 0.5% pixel clock tolerance, which 5 times more than the required change, pixel clocks can be adjusted to maintain NTSC compatibility; typically, 240p, 480p, and 480i modes are adjusted, while 576p, 576i and HDTV formats are not.
The Audio Data Blocks contain one or more 3-byte Short Audio Descriptors (SADs). Each SAD details audio format, channel number, and bitrate/resolution capabilities of the display as follows:
| Byte | Description | |
|---|---|---|
| 0 | Data block header | |
| 1 | Format and number of channels: | |
| Bit 7 | Reserved, | |
| Bit 6–3 | Audio format code
| |
| Bit 2–0 | Number of channels minus 1
| |
| 2 | Sampling frequencies (kHz) supported: | |
| Bit 7 | Reserved, | |
| Bit 6 | 192 | |
| Bit 5 | 176 | |
| Bit 4 | 96 | |
| Bit 3 | 88 | |
| Bit 2 | 48 | |
| Bit 1 | 44.1 | |
| Bit 0 | 32 | |
| 3 | Bitrate / format dependent: | |
| For codec 1, LPCM: | ||
| Bits 7–3 | Reserved | |
| Bit 2 | 24-bit depth | |
| Bit 1 | 20-bit depth | |
| Bit 0 | 16-bit depth | |
| For audio format codecs 2–8, the maximum supported bitrate in bit/s, divided by 8000. | ||
| For audio format codecs 9–14, format dependent value. | ||
| For audio format codec 15 (Extension): | ||
| Bit 7–3 | Audio format extended code
| |
| Bits 2–0 | format dependent value | |
A Vendor Specific Data Block (if any) contains as its first three bytes the vendor's IEEE 24-bit registration number,[22] least significant byte first. The remainder of the Vendor Specific Data Block is the "data payload", which can be anything the vendor considers worthy of inclusion in this EDID extension block. For example, IEEE registration number means this is a "HDMI Licensing, LLC" specific data block (contains HDMI 1.4 info), means this is a "HDMI Forum" specific data block (contains HDMI 2.0 info), means this is "DOLBY LABORATORIES, INC." (contains Dolby Vision info) and is "HDR10+ Technologies, LLC" (contains HDR10+ info as part of HDMI 2.1 Amendment A1 standard[23]). It starts with a two byte source physical address, least significant byte first. The source physical address provides the CEC physical address for upstream CEC devices. HDMI 1.3a specifies some requirements for the data payload.
| Byte | Description | ||
|---|---|---|---|
| 0 | Data block header | ||
| 1–3 | IEEE Registration Identifier (little endian) | ||
| 4–5 | Components of Source Physical Address[24] | ||
| 6 | (optional), supported;, unsupported: | ||
| Bit 7 | A function that needs info from ACP or ISRC packets | ||
| Bit 6 | 16-bit-per-channel deep color (48-bit) | ||
| Bit 5 | 12-bit-per-channel deep color (36-bit) | ||
| Bit 4 | 10-bit-per-channel deep color (30-bit) | ||
| Bit 3 | 444 in deep color modes | ||
| Bit 2 | Reserved, | ||
| Bit 1 | Reserved, | ||
| Bit 0 | DVI Dual Link Operation | ||
| 7 | (optional) Maximum TMDS frequency., unspecified; else, Max_TMDS_Frequency / 5MHz | ||
| 8 | (optional) Latency fields indicators, present;, absent: | ||
| Bit 7 | Latency fields | ||
| Bit 6 | Interlaced latency fields. Absent if latency fields are absent. | ||
| Bits 5–0 | Reserved, | ||
| 9 | Video latency | optional; if indicated, value = 1 + ms/2 with a max. of 251 meaning 500 ms | |
| 10 | Audio latency (video delay for progressive sources) | ||
| 11 | Interlaced video latency | ||
| 12 | Interlaced audio latency (video delay for interlaced sources) | ||
| 13+ | Additional bytes may be present, but the HDMI spec. says they shall be . | ||
If a Speaker Allocation Data Block is present, it will consist of three bytes. The first and second bytes contain information about which speakers (or speaker pairs) are present in the display device:
| Byte | Description | |
|---|---|---|
| 0 | Data block header | |
| 1 | , present;, absent: | |
| Bit 7 | Front left/right wide (FLw/FRw) | |
| Bit 6 | Deprecated, was Rear left/right center (RLC/RRC) | |
| Bit 5 | Front left/right center (FLc/FRc) | |
| Bit 4 | Back center (BC) | |
| Bit 3 | Back left/right (BL/BR) | |
| Bit 2 | Front center (FC) | |
| Bit 1 | Low-frequency effects (LFE) | |
| Bit 0 | Front left/right (FL/FR) | |
| 2 | ||
| Bit 7 | Deprecated, was Top side left/right (TpSiL/TpSiR) | |
| Bit 6 | Deprecated, was Side left/right (SiL/SiR) | |
| Bit 5 | Deprecated, was Top back center (TpBC) | |
| Bit 4 | Deprecated, was Low-frequency effects 2 (LFE2) | |
| Bit 3 | Left surround/right surround (LS/RS) | |
| Bit 2 | Top front center (TpFC) | |
| Bit 1 | Top center (TpC) | |
| Bit 0 | Top front left/right (TpFL/TpFR) | |
| 3 | Bits 7-3 | Reserved, |
| Bit 2 | Deprecated, was Bottom front left/right (BtFL/BtFR) | |
| Bit 1 | Deprecated, was Bottom front center (BtFC) | |
| Bit 0 | Deprecated, was Top back left/right (TpBL/TpBR) | |
Some speaker flags have been deprecated in the SADB, but are still available in the RCDB's SPM. These speakers could not be indicated with a CA value in the Audio InfoFrame, and can only be used with Delivery According to the Speaker Mask, which corresponds to the RCDB only.
The Room Configuration Data Block and Speaker Location Data Blocks describe the speaker setup using room coordinates.
| Byte | Description | |
|---|---|---|
| 0 | Data block header | |
| Bits 7-5 | =7, block type tag | |
| Bits 4-0 | Length of payload data that follows this block, in bytes | |
| 1 | = extended tag code | |
| 3 | Configuration | |
| Bit 7 | Display data is valid | |
| Bit 6 | Speaker count is valid | |
| Bit 5 | Speaker location descriptors (SLD) are present | |
| Bits 4-0 | Speaker count (1-32) | |
| 4 | Speaker presence mask 1 (SPM1):, present;, absent | |
| Bit 7 | Front left/right wide (FLw/FRw) | |
| Bit 6 | Deprecated, was Rear left/right center (RLC/RRC) | |
| Bit 5 | Front left/right center (FLc/FRc) | |
| Bit 4 | Back center (BC) | |
| Bit 3 | Back left/right (BL/BR) | |
| Bit 2 | Front center (FC) | |
| Bit 1 | Low-frequency effects 1 (LFE1) | |
| Bit 0 | Front left/right (FL/FR) | |
| 5 | Speaker presence mask 2 (SPM2):, present;, absent | |
| Bit 7 | Top side left/right (TpSiL/TpSiR) | |
| Bit 6 | Side left/right (SiL/SiR) | |
| Bit 5 | Top back center (TpBC) | |
| Bit 4 | Low-frequency effects 2 (LFE2) | |
| Bit 3 | Left/right surround (LS/RS) | |
| Bit 2 | Top front center (TpFC) | |
| Bit 1 | Top center (TpC) | |
| Bit 0 | Top front left/right (TpFL/TpFR) | |
| 6 | Speaker presence mask 3 (SPM3):, present;, absent | |
| Bits 7-4 | Reserved, | |
| Bit 3 | Deprecated, was Top left/right surround (TpLS/TpRS) | |
| Bit 2 | Bottom front left/right (BtFL/BtFR) | |
| Bit 1 | Bottom front center (BtFC) | |
| Bit 0 | Top back left/right (TpBL/TpBR) | |
| 7-9 | Maximum distance from the primary listening position to the farthest speakers along X, Y, Z axes, if speaker location descriptors (SLD) blocks are present; otherwise = undefined | |
| 10-13 | Distance from the primary listening position to the center of display along X, Y, Z axes; = undefined when display data flag is not set | |