User's Manual

PMAC2 PCI Hardware Reference Manual
Flex CPU Board Jumper Descriptions 11
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