General Description - Motorola RAM104 User Manual

General Description

The RAM104 is a DRAM Memory module that plugs into the PM603 and
PM604 Processor/Memory mezzanine modules that plug into the
MVME160x Single Board Computers (refer to Figure 1-1).
For the processor/memory module, you initially have the choice of
PowerPC 603 or PowerPC 604 with 8 to 64MB of DRAM. There is no
parity or ECC protection on the DRAM. The memory is divided into two
banks, but not interleaved. This supports read and write bursts of 8-4-4-4.
The processor module also has sockets for 1MB of Flash.
The MPC105 bridge/memory controller provides the bridge between the
PowerPC microprocessor bus and the PCI local bus. The memory is kept
on the processor bus to get the optimum performance from the designs.
Electrically, the processor/memory module is a PCI connection. The form
factor, however, is unique to this design so as to optimize every square
millimeter.
The PM604 modules have a heatsink on the PowerPC 604 that does extend
into the next VME slot, so MVME1604 boards have double wide front
panels.
Memory can be added to the processor/memory module to expand the
memory capacity. RAM104 modules of 8, 16, 32, or 64MB are available
for memory expansion. These have only DRAMs and bypass capacitors on
them. Adding the memory module on the processor/memory module
means that now the stack is three boards high. The PM603 on an
MVME160x still maintains a single VME slot space with the stacking. It
does enter the buffer space that is specified for clearance between cards,
but it does not extend beyond the inter-board separation plane.
The onboard monitor/debugger (PPCBug), resides in the Flash memory
chips that plug into the two 32-pin sockets(1 MB total, 2 banks 512K x 8).
The PPCBug provides:
boot loader and extensive onboard diagnostics
single line assembler & disassembler
configuration save and restore through NVRAM
remote boot capability
The PM603 and PM604 Processor/Memory mezzanine modules plug into
the MVME160x Single Board Computers.
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General Description
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