Reference Manual

PMAC PCI Lite Hardware Reference Manual
Connector Pinouts
47
J3: Multiplexer Port Connector
J3 JTHW (26-Pin Connector)
Front View
Pin # Symbol Function Description Notes
1 GND Common PMAC Common
2 GND Common PMAC Common
3 DAT0 Input Data-0 Input Data input from multiplexed accessory
4 SEL0 Output Select-0 Output Multiplexer select output
5 DAT1 Input Data-1 Input Data input from multiplexed accessory
6 SEL1 Output Select-1 Output Multiplexer select output
7 DAT2 Input Data-2 Input Data input from multiplexed accessory
8 SEL2 Output Select-2 Output Multiplexer select output
9 DAT3 Input Data-3 Input Data input from multiplexed accessory
10 SEL3 Output Select-3 Output Multiplexer select output
11 DAT4 Input Data-4 Input Data input from multiplexed accessory
12 SEL4 Output Select-4 Output Multiplexer select output
13 DAT5 Input Data-5 Input Data input from multiplexed accessory
14 SEL5 Output Select-5 Output Multiplexer select output
15 DAT6 Input Data-6 Input Data input from multiplexed accessory
16 SEL6 Output Select-6 Output Multiplexer select output
17 DAT7 Input Data-7 Input Data input from multiplexed accessory
18 SEL7 Output Select-7 Output Multiplexer select output
19 N.C. N.C. No Connection
20 GND Common PMAC Common
21 BRLD/ Output Buffer Request Low is buffer req.
22 GND Common PMAC Common
23 IPLD/ Output In Position Low is in position
24 GND Common PMAC Common
25 +5V Output +5vdc Supply Power supply out
26 INIT/ Input PMAC Reset Low is reset
The JTHW multiplexer port provides eight inputs and eight outputs at TTL levels. While these I/O can be used in
un-multiplexed form for 16 discrete I/O points, most users will utilize PMAC software and accessories to use this
port in multiplexed form to greatly multiply the number of I/O that can be accessed on this port. In multiplexed
form, some of the SELn outputs are used to select which of the multiplexed I/O are to be accessed.
See:
I/O and Memory Map Y:$FFC1
Suggested M-variables M40 - M58
M-variable formats TWB, TWD, TWR, TWS
Acc-8D Opt 7, Acc-8D Opt 9, Acc-18, Acc-34x, NC Control Panel