Flash Memory - Motorola MVME2603-1121A Installation And Use Manual

Block Diagram
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Flash Memory

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The PowerPC 603 is a 64-bit processor with 32KB on-chip cache
(16KB data cache and 16KB instruction cache). The PowerPC 604 is
a 64-bit processor with 32 KB on-chip cache (16KB data cache and
16KB instruction cache).
The Raven bridge controller ASIC provides the bridge between the
PowerPC microprocessor bus and the PCI local bus. Electrically, the
Raven chip is a 64-bit PCI connection. Four programmable map
decoders in each direction provide flexible addressing between the
PowerPC microprocessor bus and the PCI local bus.
The MVME2603/2604 base board has provision for 1MB of 16-bit
Flash memory in two 8-bit sockets. The RAM200 memory
mezzanine accommodates 4MB or 8MB of additional 64-bit Flash
memory.
The onboard monitor/debugger, PPCBug, resides in the Flash
chips. PPCBug provides functionality for:
Booting the operating system
Initializing after a reset
Displaying and modifying configuration variables
Running self-tests and diagnostics
Updating firmware ROM
Under normal operation, the Flash devices are in Òread-onlyÓ
mode, their contents are pre-defined, and they are protected against
inadvertent writes due to loss of power conditions. However, for
programming purposes, programming voltage is always supplied
to the devices and the Flash contents may be modified by executing
the proper program command sequence. Refer to the third-party
data sheet and/or to the PPCBug Firmware Package UserÕs Manual for
further device-specific information on modifying Flash contents.