User's Manual

Turbo PMAC2 VME Hardware Reference
16 Base Board Connector Pinouts
J2 (JTHW) Multiplexer Port Connector
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 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 connector provides eight inputs and eight outputs at TTL levels; these are dedicated to reading BCD
thumbwheel switches. Two thumbwheels may be read by direct connection to J3, more thumbwheels, up to 512
switches, may be read using the Acc-18 (Thumbwheel Multiplexer). J3’s inputs and outputs may be used as
general purpose multiplexed TTL I/O, if thumbwheels are not used.