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8. DDC command protocol
8-1. Signal TABLE
8-2. E2PROM Data Write
(1) Signal TABLE
LEN
: 84h+Bytes
CMD : E8h
ADH : E2PROM Slave Address (A0,A2,A4,A6), Not 00h
ADH : E2PROM Slave Address (A0,A2,A4,A6), Not 00h
(Reserved by BufferToEEPROM)
ADL
: E2PROM Sub Address(00~FF)
Data : Write data
Delay : 20ms
Delay : 20ms
(2) Command Set
* Purpose
1) EDID write : 16-byte by 16-byte, 8 order (128-byte)
write(TO “00 – 7F” of “EEPROM Page A4”).
2) FOS Default write : 14-mode data write
(SyncFlags, HPeriodH, HPeriodL, VtotalH, VtotalL,
SrcHTotalH, SrcHTotalL, SrcHStartH, SrcHStartL,
SrcVStartH, SrcVStartL, HsyncPhase).
SrcHTotalH, SrcHTotalL, SrcHStartH, SrcHStartL,
SrcVStartH, SrcVStartL, HsyncPhase).
3) Random Data write : write the appointment Address of
E2PROM.
(3) E2PROM Data Read
1) Signal TABLE
2) COMMAND SET
* Purpose : To read(84h) the appointment Address of E2PROM
by 128(80h)-byte
Delay 20m
VAL
128 Bytes
Delay 150ms
EEPROM WRITE
E8h
94
16-Byte Write
(84+n)h
n-byte Write
Adjustment contents
CMD(hex)
LEN
Details
EEPROM READ
E7
A0
0
0-Page 0~7F Read
80
0-Page 80~FF Read
A2
0
1-Page 0~7F Read
80
1-Page 80~FF Read
A4
0
2-Page 0~7F Read
80
2-Page 80~FF Read
A6
0
3-Page 0~7F Read
80
3-Page 80~FF Read
Adjustment contents CMD(hex) ADH(hex) ADL(hex)
Details
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