Motorola Embedded Controller Manual De Usuario

Functional Description

1-25

The MVME162LX includes many resources for the local processor. 
These include tick timers, software-programmable hardware 
interrupts, watchdog timer, and local bus timeout. 

Six 32-bit programmable tick timers with 1

µ

s 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. 

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).