User's Manual

PMAC2A PC104 Hardware Reference Manual
E-Point Jumper Descriptions
30
E4: CPU Frequency Select
E Point and
Physical Layout
Location Description Default
E4
C4 Remove jumper for 40 MHz operation (E2
OFF also) or for 60 MHz operation (E4 ON).
Jump pin 1 to 2 for 80 MHz operation (E2
OFF).
No jumper installed
(standard or Option 5EF)
Jumper installed (Option
5CF)
E8: Phase Clock Lines Output Enable
E Point and
Physical Layout
Location Description Default
E8
B1 Jump pin 1 to 2 to enable the PHASE clock
line on the J8 connector, allowing
synchronization with another PMAC.
Remove jumper to disable the PHASE clock
line on the J8 connector.
No Jumper
E9: Servo Clock Lines Output Enable
E Point and
Physical Layout
Location Description Default
E9
B1
Jump pin 1 to 2 to enable the SERVO clock
line on the J8 connector, allowing
synchronization with another PMAC.
Remove jumper to disable the SERVO clock
line on the J8 connector.
No Jumper
E10 – E12: Power-Up State Jumpers
E Point and
Physical Layout
Location Description Default
E10
E12
E5 Remove jumper E10;
Jump E11;
Jump E12;
To read flash IC on power-up/reset
Other combinations are for factory use only;
the board will not operate in any other
configuration.
No E10 jumper installed;
Jump E11 and E12