LG 20HIZ20, Service Manual

Page: 11 / 30

5.2. EEPROM DATA READ
(1) Signal Table
(2) Command Set
Purpose : To read the appointment Address of E2PROM by
128(80h)-byte
5.3. E 2 PROM Data Write
(1) Signal Table
LEN : 84h+Bytes
CMD : 8Eh
ADH : E 2 PROM Slave Address(A0,A2,A4,A6,A8),
Not 00h(Reserved by BufferToEEPROM)
ADL : E2PROM Sub Address(00~FF)
Data : Write data
(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 : 16-mode data (HFh, HFl, VF, STD,
HP, VP, Clk, ClkPh, PhFine) write
3) Random Data write : write the appointment Address of
E2PROM
5.4. VRAM Read
1) Send CMD(70h) to read Video RAM value from MICOM
And save its value to 128-Bytes Buffer(Common Buffer for
the use of EDID).
2) Delay 500ms(Time to wait and read vZideo RAM from
MICOM)
3) Be transmitted the contents of MICOM’s 128-bytes Buffer to
PC.(128th Data is the CheckSum of 127-bytes data : That’s
OK if the value of adding 128-bytes Data is Zero)
- 11 -
ST OP
A A A A A 50 6E 03 CMD A DH 84+ n ST ART A DL A
CS
A
A Data_1 A . . . Data_n A
No.
1
2
Adjustment contents
EEPROM WRITE
CMD(hex)
E8
LEN
94
84+n
Details
16-Byte Write
n-byte Write
ADL(hex)
0
80
0
80
0
80
0
80
Details
0-Page 0~7F Read
0-Page 80~FF Read
1-Page 0~7F Read
1-Page 80~FF Read
2-Page 0~7F Read
2-Page 80~FF Read
3-Page 0~7F Read
3-Page 80~FF Read
Adjustment Contents
EEPROM READ
CMD(hex)
E7
ADR(hex)
A0
A2
A4
A6
ST OP A A D1 6F
ST OP
ST ART
A
A
A
Dn
A A A 50 6E 03 CMD A DH 84 ST ART A A A DL A CS
128 Bytes
Delay 100ms
A CS A Data1 6F ST ART . . . Data12 ST OP NA
ST OP
A A A A A 50 6E 03 70 00 84 ST ART A A 00 A CS