Circuit Diagram (10/13) - Oki OKIFAX4550 Maintenance Manual

3.10 46F Circuit Diagram (10/13)
1. Block diagram
46F-PCB circuit diagram (10/13) shown the consists of the following connectors:
• Connector CN11 that provides an interface between 46F board and Bi-Centro I/F.
Figure A.15 (1/2) shows the interface between 46F and Bi-Centro I/F.
Figure A.15 (2/2) shows the timing chart of Centronics Parallel Interface.
Figure A.15 (1/2) Interface between 46F 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 (PD0 to
PD7) from the parallel port at the fall of STB-N signal. Furthemore, it makes the store processing
of receiving data into a recive buffer terminate wthin a certain fixed time and outputs an ACK-
N signal, setting the BUSY-P signal to OFF.
PARALLEL DATA
(PD0 to PD7)
DATA STOROBE
(PSBN)
BUSY
ACKNOWLEDGE
(ACKN)
Figure A.15 (2/2) Timing Chart of Centronics Parallel Interface
41309401TH Rev.4
PD0 to PD7
IC2
PSBN
IPRN
SLIN
AFXN
IOGA4
BSYP (BUSY)
ACK-N (nACK)
PEP (PError)
SELP (Select)
FLT-N (nFault)
0.5 µs min.
0.5 µs min.
0.5 µs max.
0 min.
0.5 µs to 10 µs
46F
CN11
pin 2 to pin 9
1
31
36
14
11
Bi-Centro I/F
10
12
13
32
0.5 µs min.
0.5 µs min.
0 min.
0 min.
0 min.
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