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3-1.
MFB2 Board
• The MFB board is a main controller that has an external 32 (internal 64) bit RISC proces-
sor. It controls several units of the system (e.g., circuitry of each unit, transmitter, reader,
printer, mechanically moving parts, and operation) according to system software.
The MFB2 board has 4 main blocks:
(1)
Main Controller
1. Overview
• CPU and an IPUS LSI for controlling several blocks and work memory (DRAM).
• The main controller also uses the information of the backup memory (SRAM) mounted
on FAX1 (ROM/RAM) board for various controls.
Block diagram
ROM
CPU
Address bus
AD bus
ROM data bus
IPUS LSI
DRAM
SRAM
Back up battery
Address bus
Data bus
Various
Clock
I/Os
M-6
MFB2
Control
LCD
panel
FAX1
4015M502CA
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