Oki OKIFAX 5400 Maintenance Manual page 303

E17
A3.1.14 E17 Circuit Diagram
1. Block diagram
The circuit diagram shown on page 15/16 consists of the following functions and connectors:
•
Figure A3.1.20 shows the block diagram of DRAM.
2. Function
1)
A1 - A10
RAS1-N
WRL-N
CASH-N
CASL-N
40838301TH Rev.1
RAM2 to RAM5
DRAM
1 M x 16 bit DRAM x 2 (RAM2 and RAM3)
• Used as follows:
Picture memory for the ECM send/receive modes.
Picture memory for the memory transmission mode.
Picture memory for the retransmission mode.
Picture memory for the reception in memory.
Editing for report printing.
A1 - A10
A1 - A10
Figure A3.1.20 Block Diagram of DRAM
RAM2/RAM3
DRAM
AD0 - AD15
1M x 16bit
x 2
NOMOUNT
RAM4/RAM5
AD0 -
AD15
DRAM
1M x 8bit
x 2
A3 - 22
AD0 - AD15