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RAM500 Memory Expansion Module
6.1
Overview
The RAM500 memory expansion module is used on the CPCI-6020 as its on-board memory
capability. No on-board memory exists on the CPCI-6020; therefore, the CPCI-6020 will not
function properly without at least one RAM500 memory module installed.
Each expansion module is a single bank of SDRAM with up to 512 MB of available ECC
memory. Currently, you can use two expansion modules in tandem to produce an additional
expanded memory capability of 1 GB per memory module site. (In the case of the CPCI-6020,
two memory module sites exist for a potential of 2 GB of memory.
There are two configurations of the board to accommodate tandem usage:
The bottom expansion module has both a bottom and top connector, one to plug into the
baseboard 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 per memory mezzanine site are allowed: one bottom
and one top. If only one module is used, the RAM500 module with the top configuration is
recommended.
6.2
RAM500 Description
The RAM500 is a memory expansion module that is used on the CPCI-6020 Single Board
Computer, as well as other Motorola products. 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 three sizes: 128 MB,
256 MB and 512 MB. The SDRAM memory is controlled by the Hawk or Harrier ASIC, which
provides single-bit error correction and double-bit error detection. ECC is calculated over 72-
bits. Refer to the CPCI-6020 Single Board Computer Programmer's Reference Guide and the
Harrier Application Specific Integrated Circuit (ASIC) Programmer's Reference Guide 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
CPCI-6020 CompactPCI Single Board Computer Installation and Use (6806800A51C)
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Table 6-1
for memory options.
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