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Edid Data Read/Write - NEC MultiSync LCD2080UX -BKA Service Manual

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2.7.5 EDID DATA read/write

Table 2.7.5 Control Terminals of the EEPROM (IC8A1 / IC8F1)
DVI-I
DIGITAL
Reading
DVI-I
from
ANALOG
EEPROM
DVI-D
DSUB
DVI-I
DIGITAL
DVI-I
Writing in
ANALOG
EEPROM
DVI-D
DSUB
When writing EDID of DVI-D, the data input from the D-SUB should be entered. For both INPUT1 and
INPUT2, the DDC-CI commands for writing should be as shown below.
1) Enter the Factory mode.
2) Send a cancel command of WRITE PROTECT. (6E-51-85-C8-03-7E-00-01-CHK)
3) Send a DIGITAL Select command. (6E-51-85-C8-02-36-00-01-CHK)
4) Write the EDID data of DIGITAL.
5) Send an ANALOG Select command. (6E-51-85-C8-02-36-00-00-CHK)
6) Write the EDID data of ANALOG.
7) Turn off the power supply.
IC8A1
IC8F1
DDCENA
DDCENA
10pin
10pin
H
L
H
L
L
H
L
H
IC8A1
IC8F1
DUALPCB
DUALPCB
12pin
12pin
H
H
H
L
H
L
H
H
H
H
H
H
7-9
IC8A1
IC8F1
BANKSEL
BANKSEL
11pin
11pin
H
L
H
L
H
L
H
L
CPU
CPU
/DVISEL1
/WP
P21
P20
L
L
L
L
H
L
H
L
L
H
L
H
H
H
H
H

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