Onboard Memory Mezzanine Module; Scsi Mass Storage Interface - Motorola MVME167 Series Installation Manual

Board Level Hardware Description

Onboard Memory Mezzanine Module

2

SCSI Mass Storage Interface

2-2
The MVME167 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 32MB (parity), or 4, 8,
16, 32, 64, or 128MB (ECC),
Ð Two 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.
The MVME167 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.