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Functional Description
SCSI Interface
4
SCSI Termination
Local Resources
4-16
The MVME177 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
The SCSI interface is implemented using the NCR 53C710 SCSI I/O
controller.
The SCSI clock input to the 53C710 is fixed at 50 MHz, in order to
have higher SCSI bus performance, and to make it easier for
software to program the 53C710 controller when the MC68060
processor speed changes.
Support functions for the 53C710 are provided by the PCCchip2.
Refer to the 53C710 user's guide and to the Single Board Computers
Programmer's Reference Guide for detailed programming
information.
The system configurer must ensure that the SCSI bus is properly
terminated at both ends. On the MVME177, sockets are provided
for the terminators on the P2 transition board. If the SCSI bus ends
at the P2 transition board, then termination resistors must be
installed on the P2 transition board. +5V power to the SCSI bus
TERM power line and termination resistors is provided through a
fuse on the MVME712 transition board, and a diode located on the
P2 transition board.
The MVME177 includes many resources for the local processor.
These include:
Tick timers
Software programmable hardware interrupts
Watchdog timer
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