Cpu And Memory - Oki OKIPAGE 12i Troubleshooting Manual

3.2

CPU and Memory

(1) CPU (MHM2029-004K)
CPU core
CPU clock
Internal CPU CLK
(2) Program and Font ROMs
ROM capacity
ROM type
Access time
(3) Resident RAM
RAM capacity
RAM type
Access time
(4) Option Board
RAM capacity (chip)
RAM type (chip)
Access time (chip)
SIMM 1 socket
SIMM 2 socket
Flash ROM capacity (chip)
Flash ROM type (chip)
Access time (chip)
The block diagram of CPU and memory circuit is shown in Fig. 3-3.
The timing chart of CPU and memory ciucuit is shown in Fig. 3-4.
RISC CPU (MIPS R3000 compatible)
20.2752 MHz
40.5504 MHz
16M bytes (64M bit mask ROM two pieces)
64M bits (4M x 16 bits)
100 ns
4M bytes (16-Mbit D-RAM two pieces)
16M bits (1M x 16 bits)
60 ns
1M byte
4M bits D-RAM two pieces
60 ns
2, 4, 8, 16 or 32M bytes, 72 pin DRAM SIMM, 60 to 100 ns
Flash SIMM (72 pin)
4 M byte or 8 M byte
8M bits Flash ROM four pieces or 16M bits Flash ROM four
pieces.
90 ns
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Memory Expansion Board only