Motorola MVME1X7P - Manual (Page 43)

Functional Description
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Watchdog Timer
The VMEchip2 ASIC supplies a watchdog timer function. When enabled,
the watchdog timer must be reset by software within the programmed
interval or it times out. The watchdog timer can be programmed to
generate a SYSRESET
∗
signal, a local reset signal, or a board fail signal if
it times out. Refer to Chapter 2, VMEchip2 for detailed programming
information.
Software-Programmable Hardware Interrupts
The VMEchip2 ASIC supplies eight software-programmable hardware
interrupts. These interrupts allow software to create a hardware interrupt.
Refer to
Chapter 2, VMEchip2 for detailed programming information.
Local Bus Timeout
The MVME167P and MVME177P single-board computers provide a
timeout function in the VMEchip2 ASIC 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 time-out
value is selectable by software for 8
µ
sec, 64
µ
sec, 256
µ
sec, 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. Refer to
Chapter 2, VMEchip2 for detailed
programming information.
Functional Description
This section highlights a few specific features of the MVME1X7P single-
board computers. For a complete functional description of the major
blocks of the MVME1X7P, refer to the Installation and Use manual.