Motorola Single Board Computer, MVME5100 manual Functional Description, RAM500 Description

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Functional Description

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-2for 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.

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