Toshiba DP120F, Service Manual

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DP120F/DP125F Circuit Description 7-68 March 2000 © TOSHIBA TEC
• I/OP-1 GA Signal Table (1/3)
No. Signal Name Type Functions
1, 25, 41, 52, +5V - +5V
61
2-9 D0-7 I/O Data bus
10, 34, 42, SG - Signal ground
46, 51, 56,
60, 71
11 IOCS3X I I/OP-1 GA chip select signal (active-low)
Select signal for I/OP-1 GA (IC7).
12 IOWRX I I/O write signal (active-low)
Writes data to each IC and I/O.
13 IORDX I I/O read signal (active-low)
Reads data into each IC and I/O.
14-16 A1-3 I Address bus
17, 18 HSWC0, 1 - Signal ground
19 OPNCU I Line 2 NCU PBA connection detect signal
(H: Unconnected, L: Connected)
Detects the connection status line 2 of the NCU PBA.
20, 21 HSWC3, 4 - Signal ground
22 OREVB2 I Line 2 current reverse current detect signal
Detects the reversed current which flows through line
2 of the NCU PBA.
23 OREVA2 I Line 2 current detect signal
Detects the current which flows through line 2 of the
NCU PBA.
24 OCI2 I Line 2 CI detect signal (H: Undetected, L: Detected)
Detects the ring signal sent from line 2 of the NCU
PBA.
26, 27 HSWS0, 1 - Unused
28, 29 RLADJ22, 1 O Line 2 return loss adjust control signal
(EU/AU/ASIA models only)
Adjusts the return loss by switching the circuit.
RLADJ21
RLADJ22
LOW LOW ASIA
LOW HIGH Unused
HIGH LOW AU
HIGH HIGH CTR21 (EU)
I: Input O: Output I/O: Bidirectional