Personal Computer User Manual

D
D-1
DRAM500 Memory Expansion
Module
Overview
The RAM500 memory expansion module can be used on the MVME5100
as an option for additional memory capability. Each expansion module is
a single bank of SDRAM with up to 256MB of available ECC memory.
Currently, two expansion modules can be used in tandum to produce an
additional expanded memory capability of 512MB. There are two
configurations of the board to accommodate tandum usage. The bottom
expansion module has both a bottom and top connector: one to plug into
the base board, and one to mate with the second RAM500 module. The top
expansion module is designed with just a bottom connector to plug into the
lower RAM500 module. The RAM500 incorporates a Serial ROM for
system memory Serial Presence Detect (SPD) data.
A maximum of two expansion modules are allowed: one bottom and one
top. If only one module is used, the RAM500 module with the top
configuration is recommended.
Features
The following table lists the features of the RAM500 memory expansion
module:
Table D-1. RAM500 Feature Summary
Form Factor Dual sided mezzanine, with screw/post attachment to host board
SROM Single 256x8 I
2
C SROM for Serial Presence Detect Data
SDRAM Double-Bit-Error detect, Single-Bit-Error correct across 72 bits
64MB or 256MB mezzanine memory @ 100MHz as a goal
Memory Expansion
Flexibility
Any RAM500 memory size can be attached to the host board followed
by any secondary RAM500 memory size for maximum memory
expansion flexibility.