user manual

MVME177 Functional Description
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4
❏ Local bus time-out
Note The time basis for all local resources is set by Prescaler
register(s). Refer to the Single Board Computers
Programmer's Reference Guide for detailed programming
information.
Programmable Tick Timers
Four 32-bit programmable tick timers with 1 µs 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 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 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 Single Board
Computers Programmer's Reference Guide for detailed programming
information.