User's Manual

PMAC2 VME Hardware Reference Manual
Connectors 9
J2/JTHW (26-Pin Header)
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 Mux Port Accessories
4 SEL0 Output Select-0 Output Address/Data Output for Mux Port Accessories
5 DAT1 Input Data-1 Input Data Input from Mux Port Accessories
6 SEL1 Output Select-1 Output Address/Data Output for Mux Port Accessories
7 DAT2 Input Data-2 Input Data Input from Mux Port Accessories
8 SEL2 Output Select-2 Output Address/Data Output for Mux Port Accessories
9 DAT3 Input Data-3 Input Data Input from Mux Port Accessories
10 SEL3 Output Select-3 Output Address/Data Output for Mux Port Accessories
11 DAT4 Input Data-4 Input Data Input from Mux Port Accessories
12 SEL4 Output Select-4 Output Address/Data Output for Mux Port Accessories
13 DAT5 Input Data-5 Input Data Input from Mux Port Accessories
14 SEL5 Output Select-5 Output Address/Data Output for Mux Port Accessories
15 DAT6 Input Data-6 Input Data Input from Mux Port Accessories
16 SEL6 Output Select-6 Output Address/Data Output for Mux Port Accessories
17 DAT7 Input Data-7 Input Data Input from Mux Port Accessories
18 SEL7 Output Select-7 Output Address/Data Output for Mux Port Accessories
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 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.