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PMAC2 VME Hardware Reference Manual
J2/JTHW (26-Pin Header)
Pin # Symbol
3 DAT0
Function
Input
Front View
Description
PMAC
PMAC
Data-0 Input
Notes
Data Input from Mux Port Accessories
5
7
DAT1
DAT2
Input
Input
Data-1 Input
Data-2 Input
Data Input from Mux Port Accessories
Data Input from Mux Port Accessories
9 DAT3 Input Data-3 Input
10 SEL3 Output
11 DAT4 Input Data-4 Input
12 SEL4 Output
13 DAT5 Input Data-5 Input
Data Input from Mux Port Accessories
Data Input from Mux Port Accessories
Data Input from Mux Port Accessories
14 SEL5 Output
15 DAT6 Input Data-6 Input
16 SEL6 Output
17 DAT7
18 SEL7
Input Data-7 Input
Output Output
Data Input from Mux Port Accessories
Data Input from Mux Port Accessories
Address/Data Output for Mux Port Accessories
19 N.C. N.C. No
21 BRLD/
PMAC
Output Buffer Low Is Buffer Req.
23 IPLD/ Output
PMAC
In Position Low Is In Position
PMAC
25
26
+5V
INIT/
Output
Input
+5Vdc Supply
PMAC Reset
Power Supply Out
Low Is Reset
The JTHW connector provides eight inputs and eight outputs at TTL levels; typically these are used to create multiplexed I/O with accessory boards such as Acc-18 (Thumbwheel) and Acc-34 (Discrete I/O). The port I/O may also be used directly, as non-multiplexed I/O.
Connectors 9
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