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MVME55006E Single-Board Computer Installation and Use (6806800A37D)
47
RAM55006E Memory Expansion
Module
3.1 Overview
The RAM55006E memory expansion module can be used on the MVME5500 as an option for
additional memory capability. The expansion module has two banks of SDRAM with up to
512MB of available ECC memory. The RAM55006E incorporates a serial ROM (SROM) for
system memory serial presence detect (SPD) data. The RAM55006E will hereafter be called
the RAM5500.
3.2 Features
The following table lists the features of the RAM5500 memory expansion module:
3.3 Functional Description
The following sections describe the physical and electrical structure of the RAM5500 memory
expansion module.
3.3.1 RAM5500 Description
The RAM5500 is a memory expansion module that is used on the MVME5500 single board
computer. It is based on a single memory mezzanine board design with two banks of memory.
Each bank is 256MB of ECC memory using 256Mb devices in 32MB x 8 device organization.
The RAM5500 provides a total added capacity of 512MB to the MVME5500. The SDRAM
memory is controlled by the GT-64260B, which provides single-bit error correction and double-
bit error detection. ECC is calculated over 72-bits. The on-board I2C SROM contains SPD data
for the two banks, which is used by the memory controller for configuration. Refer to the
MVME5500 Single Board Computer Programmer’s Reference Guide (V5500A/PG) for more
information.
The RAM5500 memory expansion module is connected to the host board with a 140-pin AMP
4mm Free Height plug connector. This memory expansion module draws +3.3V through this
connector.
Table 3-1 RAM5500 Feature Summary
Form Factor Dual-Sided Mezzanine
SROM Single 256 x 8 I2C SROM for SPD data
SDRAM Double-bit error detect, single-bit error correct across 72 bits;
512MB mezzanine memory (two banks of 256MB memory in each) at 133 MHz