Oki OKIFAX 5950 Series Maintenance Manual page 488

BOOT2
CPU
CUREQ-N
SH7034
A (3:0)
19.6680MHz
12. 288MHz
INTG4-N
PDET
Note: Driven by +5 Vs
S-side
*
Power
supply
detection
* Not mounted
FLASH MEMORY
EPLD
(512KByte)
EPM7032LC44
PCMDOWN-N
CS, RD, W
R
HC244 HC244 HC244
1/2 1/2 1/2
AD (7:0)
ISDN controller
YTD423
PCMOUT
PCMIN
PCM codec
HTD HRD
MSM7507-01
LTD LRD
HC244
1/2
ISDN driver
CLK8K, 64K
YTD421
R-side
CN3 (RJ-45)
G4A Board Block Diagram
D-RAM
(2MByte)
A (19:0)
AD (15:0)
CS, ED, MR, etc
Dual port
RAM
(2KByte)
CUREQ-N
OPG4DCTO, 1 ,2, 3
O.C
OPG4REQ, G4RDY
O.C
S
Gain
R
controller
PDOWN
Internal bus
CN 1 (MCNT I/F)
ALS244
A (16:1)
× 2
ALS245
D (15:0)
× 2
CE, RD, MR, etc
OPDCTO, 1, 2, 3-N
OPREQ-N, RDY-N
BOOT2 BOOT2
S
R
HOOK2
A (15:0)
D (15:0)
CE, RD, MR, etc
OPDCTO, 1, 2, 3-N
OPREQ-N, RDY-N
CN 2 (MUPIS)