User's Manual

Turbo PMAC PCI HRM

Connector Pinouts 43

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 Request

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 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.