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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 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.
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.
Software-Programmable Hardware Interrupts
Eight software-programmable hardware interrupts are provided
by the VMEchip2. These interrupts allow software to create a
hardware interrupt.
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 µsec, 64 µsec, 256 µsec,
or infinite. The local bus timer does not operate during VMEbus
bound cycles. VMEbus bound cycles are timed by the VMEbus
access timer and the VMEbus global timer.
Functional Description
2-23
2
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