Main Control Board (Pcr Pcb) - Oki OKIPAGE8c Maintenance Manual

2.1

Main Control Board (PCR PCB)

The control board consists of a CPU (NR4700) 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 (PCR PCB).
MPU
SysAD
SysCmd
Control
NMI
INTO
NR4700
LMQ-100
ExtReg
INT1
INT2
Reset
ColdReset
VCCOK
ModeIn
ModeClock
MasterClock
(Not installed)
External Agent
SysAD
SysCmd
Control
INT
REQ
ACK
AUX
CLK
RST
OSC
Reset circuit
DIP SW
Memory controller
64
SysAD
9
SysCmd
5
Control
Control
uPD94704
1
NMI
S1-001-F6
1
INT
Control
WDATA
1
CLK
FSYNC
1
RST
Control
Interface controller
64
SysAD PU I/F
9
SysCmd OP I/F
5
Control
1
ExtReq
1
INT
EEPD
EEPCLK
EEPCS0
1
ColdReset
1
VCCOK
1
ModeIn
1
ModeClk
EEPCS1
uPU66044
GN-014-LMU
PD
PCO
PCI
1
BusReq
1
BusAck
2
AUX
1
Reset
1
CLK
1
RSTIN
2
M
Figure 2.2
2 - 2
ROM, Flash Max 32M
22
A
64
D
11
D-RAM Max 80M
11
A
64
D
25
Engine
8
WDATA
4
ESYNC
4
Control
9
Operator
4
panel
EE-PROM #1
1
DI
1
CLK
1
CS
EE-PROM #2
DI
CLK
1
CS
74ACT1284
8
7
74ALS244
4
16
D
18
A
12
C
(Not installed)
10
(TE6135 (6137), 16550, 53C80)
DO
PS -SIMM
DO
Bi-Centro
OKI HSP
Host I/F