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Support functions for the 53C710 are provided by the PCCchip2. Refer to the 53C710
user's guide and to the MVME166/MVME167/MVME187 Single Board Computers
Programmer's Reference Guide for detailed programming information.
SCSI Termination
The system configurer must ensure that the SCSI bus is properly terminated at both
ends. On the MVME167, 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 located on the P2 transition board.
Local Resources
The MVME167 includes many resources for the local processor. These include tick
timers, software programmable hardware interrupts, watchdog timer, and local bus
timeout.
Programmable Tick Timers
Four 32-bit programmable tick timers with 1 s resolution are provided, two in the
VMEchip2 and two in the PCCchip2. The tick timers can be programmed to generate
periodic interrupts to the processor. Refer to the VMEchip2 and PCCchip2 in the
MVME166/MVME167/MVME187 Single Board Computers Programmer's Reference
Guide for detailed programming information.
Watchdog Timer
A watchdog timer function is provided in the VMEchip2. When the watchdog timer is
enabled, it must be reset by software within the programmed time or it times out. The
watchdog timer can be programmed to generate a SYSRESET signal, local reset
signal, or board fail signal if it times out. Refer to the VMEchip2 in the
MVME166/MVME167/MVME187 Single Board Computers Programmer's Reference
Guide for detailed programming information.
Software-Programmable Hardware Interrupts
Eight software-programmable hardware interrupts are provided by the VMEchip2.
These interrupts allow software to create a hardware interrupt. Refer to the VMEchip2
in the MVME166/MVME167/MVME187 Single Board Computers Programmer's
Reference Guide for detailed programming information.
Local Bus Timeout
The MVME167 provides a timeout function for the local bus. When the timer is
enabled and a local bus access times out, a Transfer Error Acknowledge (TEA) signal
is sent to the local bus master. The timeout value is selectable by software for 8 sec,
64 sec, 256 sec, or infinite. The local bus timer does not operate during VMEbus
MVME167/D3
MVME167 Functional Description
4
4-7
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