含有block的EDID格式说明1

包含 block 的 EDID

Byte sequence

00: Extension tag (which kind of extension block this is); 02h for CEA EDID

01: Revision number (Version number); 03h for Version 3

02: 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+ information

begins. 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 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:

bit 7..5: Block Type Tag (1 is audio, 2 is video, 3 is vendor specific, 4 is speaker，allocation,

all other values Reserved)

bit 4..0: Total number of bytes in this block following this byte

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 02, above) where the DTDs are known

bit 6..3: Audio format code

1 = Linear Pulse Code Modulation (LPCM)

2 = AC-3

3 = MPEG1 (Layers 1 and 2)

4 = MP3

5 = MPEG2

6 = AAC

7 = DTS

8 = ATRAC

0, 15: Reserved