User's Manual

PMAC2 PCI Lite Hardware Reference Manual – Preliminary Documentation
Introduction 3
Option 16: Battery-Backed Parameter Memory
The contents of the standard memory are not retained through a power-down or reset unless they have
been saved to flash memory first. Option 16 provides supplemental battery-backed RAM for real-time
parameter storage that is ideal for holding machine state parameters in case of an unexpected power-
down.
Option 16 provides a 16k x 24 bank of battery-backed parameter RAM in components U84, U85, U86,
with the battery in BT1.