ViewSonic Corporation
Confidential - Do Not Copy VP2650wb-1
36
<Note A> Byte4 (cksum) = Byte1 + Byte2 + Byte3
<Note B> Data = The value write to MCU or EEPROM
<Note C> XX = don't care, any value (<=0xFF).
<Note D>
When PC Host sends 0x7D command to MCU, MCU must return as following (2
bytes)
Return Code R-Byte1 R-Byte2
Checksum error code FC AA
Normal return code the above Byte3 (/data) FC
If normal return code is exact FCh FC CF
<Note E>
DDC/CI command IIC command
Command code for DDC/CI mode change to IIC alignment mode
Byte1
Byte2 Byte3 Byte4 Byte5 Byte6 Byte7 Byte8
0x6E 0x51
0x84
0x03 0xff 0x00 0x00 checksum
Description:
1. For DDC/CI supported model, its default IIC slave address is set to 0x6E, not 0x7C. So the
above command words must be issued before doing IIC alignment procedure. It is to inform
MCU that change IIC slave address from 0x6E to 0x7C.
Where Byte8 (checksum) = Byte1 xor Byte2 xor … xor Byte7
2. EEPROM mapping
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