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Board Level Hardware Description

Onboard Memory Mezzanine Module

The MVME187 onboard DRAM mezzanine boards are available in different sizes and with programmable parity protection or Error Checking and Correction (ECC) protection.

The main board and a single mezzanine board together take one slot.

Motorola software supports mixed parity and ECC memory boards on the same main board.

Mezzanine board sizes are 4, 8, 16, or 32 MB (parity), or 4, 8, 16, 32, 64, or 128 MB (ECC);

ÐTwo mezzanine boards may be stacked to provide 256MB of onboard RAM (ECC) or 64 MB (parity). The stacked configuration requires two VMEbus slots.

The DRAM is four-way interleaved to efficiently support cache burst cycles.

The parity mezzanines are only supported on 25 MHz main boards.

A functional description of the Onboard DRAM starts on page 2-15.

SCSI Mass Storage Interface

The MVME187 provides for mass storage subsystems through the industry-standard SCSI bus. These subsystems may include

Hard and floppy disk drives

Streaming tape drives

Other mass storage devices.

A functional description of the SCSI Interface starts on page 2-22.

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Motorola MVME187 manual Onboard Memory Mezzanine Module, Scsi Mass Storage Interface