PMAC2-Lite Hardware Reference Manual
E4: CPU Frequency Select
E Point &
Physical Layout
Location Description
Default
E4
Remove jumper for 40MHz operation
(E2 OFF also) or for 60MHz operation
(E4 ON).
Jump pin 1 to 2 for 80MHz operation
(E2 OFF).
No jumper
installed (standard
or Opt 5B)
Jumper installed
(Opt 5C)
Note:
On –100 versions of the PMAC2-Lite board, the maximum CPU frequency supported was 60 MHz,
so this jumper was to be OFF in all cases.
E5 – E6: (Reserved for Future Use)
E7 – E10: Host Interrupt Signal Select
E Point &
Physical Layout
Location Description
Default
E7
A9
Jump pin 1 to 2 to allow PMAC-
Interrupt to host-PC on IRQ10.
No jumper
installed
E8
A9
Jump pin 1 to 2 to allow PMAC-
Interrupt to host-PC on IRQ11.
No jumper
installed
E9
A9
Jump pin 1 to 2 to allow PMAC-
Interrupt to host-PC on IRQ12.
No jumper
installed
E10
A9
Jump pin 1 to 2 to allow PMAC
Interrupt to host-PC on IRQ15.
No jumper
installed
Note:
Only one of the jumpers E7 – E10 should be ON at any one time.
6
PMAC2-Lite E-Point Descriptions
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