Reference Manual

PMAC-PCI Hardware Reference

PMAC-PCI E-Point Jumper Descriptions 13

E-POINT DESCRIPTIONS

CPU Board E-Point Descriptions

The following jumper descriptions are for the PMAC CPU part number 602705-107.

E1: Watchdog Disable Jumper

E Point and

Physical Layout

Description Default

Jump pin 1 to 2 to disable Watchdog timer (for test purposes only).

Remove jumper to enable Watchdog timer.

No Jumper

E2: DPRAM Location Configure

E Point and

Physical Layout

Description Default

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

Remove jumper E4; jump E5 pin 1 to 2; jump E6

pin 1 to 2 to read flash IC on power-up/reset.

No E4 jumper installed;

E5 and E6 jump pin 1 to 2.

Note: Other combinations are for factory use only; the board will not operate in any other configuration

E7: Firmware Reload Enable

E Point and

Physical Layout

Description Default

Jump pin 1 to 2 to reload firmware through serial

or bus port.

Remove jumper for normal operation.

No jumper installed