Scsi Interface - Motorola MVME2700 Series Installation And Use Manual

Functional Description

SCSI Interface

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The MVME2700 VME module supports mass storage subsystems through
the industry-standard SCSI bus. These subsystems may include hard and
floppy disk drives, streaming tape drives, and other mass storage devices.
The SCSI interface is implemented using the Symbios 53C825A SCSI I/O
controller at a clock speed of 40 MHz. The SCSI I/O controller connects
directly to the PCI local bus.
MVME712M-compatible versions of the MVME2700 route the SCSI
lines through the P2 connector to the MVME712M transition module. The
SCSI control lines have filter networks to minimize the effects of VMEbus
signal noise at P2.
In the MVME761-compatible version, the SCSI lines are routed through
the P2 connector up to connector J2 on the P2 adapter board. The
MVME761 itself has no SCSI support, however, SCSI devices are
supported via the use of a three-row or five-row adapter board included
with the MVME761 transition board.
The SCSI bus is 16 bits wide in systems that support the VME64 extension
(those equipped with 5-row, 160-pin VME backplane connectors). The
SCSI bus is 8 bits wide in VME systems with three-row backplanes. Refer
to the MVME712M Transition Module and P2 Adapter Board Installation
and Use manual for the pin assignments of the SCSI connectors used on
the transition module. Refer to the Symbios 53C825A data manual, listed
in Appendix D, Related
information.
Documentation, for detailed programming
Computer Group Literature Center Web Site