R46 Circuit Diagram (12/15) - Oki OKIFAX4550 Maintenance Manual

4.9

R46 Circuit Diagram (12/15)

1. Block diagram
R46-PCB circuit diagram (12/15) shown the consists of the following connectors.
• Connector CN11 that provides an interface R46 board and Bi-Centro I/F.
IC2
IOGA6
Figure A.27 (1/2) Interface between R46 Board and Bi-Centro I/F
The LSI sets a BUSY-P signal to ON at the same time when it reads the parallel data (PDATA1-
P to PDATA8-P) from the parallel port at the fall of STB-N signal. Furthermore, it makes the store
processing of receiving data into a receive buffer terminate within a certain fixed time and outputs
an ACK-N signal, setting the BUSY-P signal to OFF.
PARALLEL DATA
(DATA BITs 1 to 8)
DATA STOROBE
BUSY
ACKNOWLEDGE
Figure A.27 (2/2) Timing Chart of Centronics Parallel Interface
41309401TH Rev.4
222, 223, 226~231
PDATA1-P to PDATA8-P
221
STB-N
234
BUSY-P
235
ACK-N
236
PE-P
232
SEL-P
233
FAULT-N
220
PINIT-N
219
SELIN-N
218
AUTOFEED-P
0.5 µs min.
0.5 µs min.
0.5 µs max.
0 min.
0.5 µs to 10 µs
CN11
IC12
3.3V 5V
DATA8-P
DATA1-P
2 to 9
STB-N
1
BUSY-P
11
ACK-N
10
PE-P
12
SEL-P
13
FAULT-N
32
IPRIME-N
31
SELIN-N
36
AUTOFEED-P
14
+5V
F501
Fuse
1A
+5V
18
0.5 µs min.
0.5 µs min.
0 min.
0 min.
to
0 min.
343 /