Turbo PMAC Clipper Hardware Reference Manual
Connections and Software Setup
38
J8: Thumbwheel Multiplexer Port (JTHW Port)
Thumbwheel Multiplexer Port on the JTHW connector has 8 inputs and 8 outputs at TTL levels. The
output lines can be used to multiplex large numbers of inputs and outputs on the port, and Delta Tau
provides accessory boards and software structures (special M-variable definitions) to capitalize on this
feature. In this form, some of the SELn outputs are used to select which of the multiplexed I/O are to be
accessed. Up to 32 of the multiplexed I/O boards may be daisy-chained on the port, in any combination.
J8 (JTHW): Multiplexer Port Connector
26-Pin Header
5
6
3
4
1
2
9
10
7
8
15
16
13
14
11
12
19
20
17
18
25
26
23
24
21
22
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
N.C.
N.C.
No Connection
22
GND
Common
PMAC Common
23
N.C.
N.C.
No Connection
24
GND
Common
PMAC Common
25
+5V
Output
+5VDC Supply
Power supply out
26
INIT-
Input
PMAC Reset
Low is Reset
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