Oki B4100 - Manual (Page 393)

40055101TH Rev.4 393 /
Figure A3.1.9 Interface between R44 Board and OPE (operation unit)
X'tal
MOS CPU
Internal ROM
Key switch
matrix
LCD unit
LEDs
IC1
Eight LEDs
KSCAN0
to
KSCAN7
KSENS0
to
KSENS7
DB0
to
DB7
Control signals
CN4 CN1
TXD
RXD
PSMODE
IRST
OPECHK
+5 V
GND
TXDOPE
RXDOPE
PSMODE
OPRST-N
OPECHK
+5 V
0 V
1
2
3
4
5
6,7
8,9
R44 OPE (04W)
13
14
15
CPU
IOGA
IC2
PCI-N
RIINT
HUP-N
Figure A3.1.8 Interface between R44 Board and NCU Board
CN10 CN3
S
R
NCU R44
S
Rp
R
CML
DP
SR
MUTE
PBXE
to OPE
to OPE
A8, B8
A4, B4
A6, B6
A3
B3
A2
A1
B1, B2
A15
A14
Modem
IOGA
IC2
IC8
Relay driver circuit
Receiving
sensitivity control
Hook-up signal
detection circuit
Ringing signal
detection circuit
OH2
RI
CPU