Delta Tau PMAC2-PC, Hardware Reference Manual, Page: 15 / 27

Turbo PMAC2 Hardware Reference Manual
JP3 : MACRO (Wired) Loopback Enable
E Point &
Physical Layout
Location Description Default
JP3
Jump JP3 pin 1 to 2 to disable
internal loopback MACRO
communications and permit true
electrical MACRO
communications.
Remove JP3 jumper to select
internal loopback MACRO
communications (for test purposes
only).
Jumper installed
JP4-JP6 : For Factory Use Only
DIP Switch Block S1: PC Bus Base Address
S1B S1A
4 3 2 1 8 7 6 5 4 3 2 1
OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF
⇑ ⇑ ⇑ ⇑ ⇑ ⇑ ⇑ ⇑ ⇑ ⇑ ⇑ ⇑
⇓ ⇓ ⇓ ⇓ ⇓ ⇓ ⇓ ⇓ ⇓ ⇓ ⇓ ⇓
ON ON ON ON ON ON ON ON ON ON ON ON
The 12 DIP switches on block S1 set the base address of the PMAC2 on the PC bus. Together
they form a binary number. Each switch, if in the “ON” (closed) position, sets its bit to 0; if in
the “OFF” (open) position, sets its bit to 1. The possible base addresses are all multiples of 16, so
switch 1 sets a bit value of 16, switch 2 sets a bit value of 32, and so on.
Switch # Bit Value Default Default
Value
Your Value
1 (S1A-1) 16 (10h) ON (x1) 16 (10h)
2 (S1A-2) 32 (20h) OFF (x0) 0
3 (S1A-3) 64 (40h) OFF (x0) 0
4 (S1A-4) 128 (80h) OFF (x0) 0
5 (S1A-5) 256 (100h) OFF (x0) 0
6 (S1A-6) 512 (200h) ON (x1) 512 (200h)
7 (S1A-7) 1024 (400h) OFF (x0) 0
8 (S1A-8) 2048 (800h) OFF (x0) 0
9 (S1B-1) 4096 (1000h) OFF (x0) 0
10 (S1B-2) 8192 (2000h) OFF (x0) 0
11 (S1B-3) 16384 (4000h) OFF (x0) 0
12 (S1B-4) 32768 (8000h) OFF (x0) 0
Total -- -- 528 (210h)
If you wish to set the board to a different bus address, it is best to specify that address in
hexadecimal form, because each hex digit corresponds to 4 switches. The last hex digit of the
base address is always zero.
8 Jumper Description
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