Emerson MVME55006E manual RAM55006E Memory Expansion Module, Functional Description

RAM55006E Memory Expansion Module

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3.1Overview

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.

3.2Features

The following table lists the features of the RAM5500 memory expansion module:

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

3.3Functional Description

The following sections describe the physical and electrical structure of the RAM5500 memory expansion module.

3.3.1RAM5500 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.

MVME55006E Single-Board Computer Installation and Use (6806800A37D) 47