User's Manual

Turbo PMAC2 PCI Hardware Reference Manual
CPU Board E-Point Descriptions 13
CPU BOARD E-POINT 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: DPRAM Location Configure
E Point and
Physical Layout
Description Default
E2
Jump pin 1 to 2 to access the dual-ported RAM on
baseboard.
Jump pin 2 to 3 to access the dual-ported RAM through
JEXP expansion port.
Jumper connects pins 1 and
2
Note: Jumper E2 is present on –108 and newer boards only. Older versions could access DPRAM from either
source without a jumper configuration, but with less robust buffering.
E4 – E6: Power-Up/Reset Load Source
E Point and
Physical Layout
Description Default
E4
E6
Remove jumper E4;
Jump E5 pin 1 to 2;
Jump E6 pin 1 to 2;
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