User's Manual

PMAC2 PCI Lite Hardware Reference Manual – Preliminary Documentation
14 Flex CPU Board Jumper Descriptions
E1: Watchdog Disable Jumper
E Point and
Physical Layout
Description Default
E1
Jump pin 1 to 2 to disable Watchdog timer. (For test
purposes only.)
Remove jumper to enable Watchdog timer.
No jumper installed
E2: Dual-Ported Ram Port Select
E Point and
Physical Layout
Description Default
E2
Jump pin 1 to 2 to access DPRAM from baseboard.
Jump pin 2 to 3 to access DPRAM through JEXP
expansion port.
Pins 1 and 2 jumpered
E4 – E6: Power-Up/Reset Load Source
E Point and
Physical Layout
Description Default
E6
E4
Remove jumper E4;
Jump E5 pin 1 to 2;
Jump E6 pin 2 to 3; 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 E4 jumper installed;
E5 and E6 jump pin 1 to 2
E7: Firmware Reload Enable
E Point and
Physical Layout
Description Default
E7
Jump pin 1 to 2 to reload firmware through serial or bus
port.
Remove jumper for normal operation.
No jumper installed
E10A, B, C: Flash Memory Bank Select
E Point and
Physical Layout
Description Default
E10A
E10C
Remove all three jumpers to select flash memory bank
with factory-installed firmware.
Use other configuration to select one of the seven other
flash memory banks.
No jumpers installed