Scsi Interface - Motorola MVME167 Series Installation Manual

Board Level Hardware Description
2

SCSI Interface

2-22
Buffer Overruns
Because the 82596CA has small internal buffers and the VMEbus
has an undefined latency period, buffer overrun may occur if the
DMA is programmed to access the VMEbus. Therefore, the
82596CA should not be programmed to access the VMEbus.
Support functions for the 82596CA are provided by the PCCchip2.
Refer to the 82596CA user's guide for detailed programming
information.
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, and other mass
storage devices.
The SCSI interface is implemented using the NCR 53C710 SCSI I/O
controller.
Support functions for the 53C710 are provided by the PCCchip2.
Refer to the 53C710 user's guide for detailed programming
information.
SCSI Termination
Because this board has no provision for SCSI termination, you must
ensure that the SCSI bus is terminated properly.
If the SCSI bus ends at the P2 adapter board, then termination
resistors must be installed on the P2 adapter board. Note: +5V
power to the SCSI bus TERM power line and termination
resistors is provided through a fuse located on the P2 adapter
board.
If there are additional SCSI mass storage devices in your
system ensure that terminators are installed on the last device
in the SCSI chain.