Personal Computer User Manual

Functional Description
D-2 Computer Group Literature Center Web Site
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Functional Description
The following sections describe the physical and electrical structure of the
RAM500 memory expansion module.
RAM500 Description
The RAM500 is a memory expansion module that is used on the
MVME5100 Single Board Computer, and will be used on other Motorola
products in the future. The RAM500 is based on a single memory
mezzanine board design with the flexibility of being populated with
different sized SDRAM components and SPD options to provide a variety
of memory configurations. The design of the RAM500 allows any memory
size module to connect to and operate with any other available memory
size module.
The optional RAM500 memory expansion module is currently available in
two sizes: 64MB and 256MB, with a total added capacity of 512MB. The
SDRAM memory is controlled by the Hawk ASIC, which provides single-
bit error correction and double-bit error detection. ECC is calculated over
72-bits. Refer to the MVME5100 Single Board Computer Programmer’s
Reference Guide (V5100A/PG) for more information.
The RAM500 consists of a single bank/block of memory. The memory
block size is dependent upon the SDRAM devices installed. Refer to Table
D-2 for memory options.
The RAM500 memory expansion module is connected to the host board
with a 140-pin AMP 0.6mm Free Height plug connector. If the expansion
module is designed to accommodate another RAM500 module, the bottom
expansion module will have two 140-pin AMP connectors installed: one
on the bottom side of the module, and one on the top side of the module.
The RAM500 memory expansion module draws +3.3V through this
connector.