Functional Description
1-25
1
Local Resources
The MVME162LX includes many resources for the local processor.
These include tick timers, software-programmable hardware
interrupts, watchdog timer, and local bus timeout.
Programmable Tick Timers
Six 32-bit programmable tick timers with 1µs resolution are
provided, four in the MC2chip and two in the optional VMEchip2.
The tick timers may be programmed to generate periodic interrupts
to the processor. Refer to the VMEchip2 and MC2chip descriptions
in the MVME162LX Embedded Controller ProgrammerÕs Reference
Guide for detailed programming information.
Watchdog Timer
A watchdog timer function is provided in both the MC2chip and
the optional VMEchip2. The timers operate independently but in
parallel. When the watchdog timers are enabled, they must be reset
by software within the programmed time or they will time out. The
watchdog timers may be programmed to generate a SYSRESET
signal, local reset signal, or board fail signal if they time out. Refer
to the VMEchip2 and MC2chip descriptions in the MVME162LX
Embedded Controller ProgrammerÕs Reference Guide for detailed
programming information.
The watchdog timer logic is duplicated in the VMEchip2 and
MC2chip ASICs. Because the watchdog timer function in the
VMEchip2 is a superset of that function in the MC2chip (system
reset function), the timer in the VMEchip2 is used in all cases except
for the version of the MVME162LX which does not include the
VMEbus interface ( described under ÒNo-VMEbus-Interface
optionÓ).