Oki ML421 Maintenance Manual - Page 26

Rev.2, OPTXD, OPCLK, OPRXD, OPCLR-N, Command second, Reset, within IC

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42113901 Rev.2 1 OPTXD Power ON OPCLK Write instruction for IC reset OPRXD 1 IC write for LED data, etc. OPCLR-N 2 Read instruction for data read Reset within IC 3 Response check for OK or NG 4 NO YES Error notification 7 5 Instruction for 6 retransmission 8 2 3 bit0 bit7 Command (first) 2 Command (second) 6 3 1 5 or 8 7 bit0 bit7 Command response (first) Note Command response (second) Oki Data CONFIDENTIAL Note: From the illustration above, you can see that the command and the command response are output at the same time. This is because the bit 0 to bit 3 of OPRXD are fixed so that the response can be returned before decoding the command. 26 /

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42113901
Rev.2
26 /
Oki
Data
CONFIDENTIAL
OPTXD
OPCLK
OPRXD
OPCLR-N
1
2
3
2
31
6
7
5
or
8
bit0
bit7
Command (first)
Command (second)
Command response (first)
Command response (second)
Note
bit0
bit7
Reset
within IC
Power ON
Write instruction for IC
reset
IC write for LED data,
etc.
Read instruction for
data read
Response check
for OK or NG
Error notification
Instruction for
retransmission
1
2
3
4
7
8
5
6
NO
YES
Note:
From the illustration above, you can see that the command and the command response are output at the same time. This is because
the
bit 0 to bit 3 of OPRXD are fixed so that the response can be returned before decoding the command.