Main Control Board (Pce Pcb) - Oki OKIPAGE 8c Plus Maintenance Manual

2.1

Main Control Board (PCE PCB)

The control board consists of a CPU (µPD30500S2-200) block, a memory control LSI block, an
interface control LSI block, a DRAM block, an EEPROM block, a mask ROM block, and an interface
block. Figure 2.2 shows the functional block diagram of the main control board (PCE PCB).
MPU
SysAD
SysCmd
Control
INTO
µPD30500
S2-200
ExtReg
INT1
Reset
ColdReset
VCCOK
ModeIn
ModeClock
MasterClock
2nd cache controller
SysAD
SysCmd
Control
Control
2nd cache
SysAD
Control
OSC
Reset circuit
DIP SW
41057601TH Rev.1
64
SysAD
9
SysCmd
5
Control
1
NMI NMI
1
INT
1
CLK
1
RST
Interface controller
64
SysAD
9
SysCmd
5
Control
1
ExtReq
1
INT
1
ColdReset
1
VCCOK
1
ModeIn
1
ModeClk
1
Reset
1
CLK
1
RSTIN
2
M
Memory controller
22
A
64
D
11
Control
uPD94704
S1-001-F6
11
A
64
D
25
Control
8
WDATA
4
FSYNC
4
Control
9
PU I/F
4
OP I/F
1
EEPD
1
EEPCLK
1
EEPCS0
uPU66044
GN-014-LMU
8
PD
5
PCO
4
PCI
16
D
18
A
12
C
10
(TE6135 (6137), 16550, 53C80)
Figure 2.2
ROM, Flash Max 32M
D-RAM Max 144M
Engine
WDATA
ESYNC
Control
Operator
panel
EE-PROM
DI
CLK DO
CS
74LVC161284 Bi-Centro
OKI HSP
(Not installed) Host I/F
13/