Main Control Board (Pce Pcb) - Oki OKICOLOR 8 Maintenance Manual

2.1

Main Control Board (PCE PCB)

The control board consists of a CPU (200MHz) 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
Reset
ColdReset
VCCOK
ModeIn
ModeClock
MasterClock
2nd cache
controller
SysAD
SysCmd
Control
Control
SysAD
Control
Reset circuit
DIP SW
41057610TH Rev. 1
64
9
5
1
NMI
1
1
1
64
9
5
1
1
INT1
1
1
1
1
1
1
OSC
1
2
Memory controller
A
SysAD
D
SysCmd
Control
Control
uPD94704
NMI
S1-001-F6
INT
A
D
Control
WDATA
CLK
FSYNC
RST
Control
Interface controller
SysAD PU I/F
SysCmd OP I/F
Control
ExtReq
INT
EEPD
EEPCLK
EEPCS0
ColdReset
VCCOK
ModeIn
ModeClk
uPU66044
GN-014-LMU
PD
PCO
PCI
D
A
C
Reset
CLK
RSTIN
M
Figure 2.2
ROM, Flash Max 32M
22
64
11
D-RAM Max 144M
11
64
25
Engine
8
WDATA
4
ESYNC
4
Control
9
Operator
4
panel
EE-PROM
1
DI
1
CLK DO
1
CS
74LVC161284 Bi-Centro
8
5
4
OKI HSP
16
18
12
(Not installed) Host I/F
10
(TE6135 (6137), 16550, 53C80)
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