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Board Level Hardware Description
1
Local Resources
Programmable Tick Timers
Watchdog Timer
1-22
The controller provides +5 Vdc to the SCSI bus TERMPWR signal
through fuse F4, located near J7. The FUSES LED (part of DS2) on the
MVME162LX front panel monitors the SCSI bus TERMPWR signal in
addition to LAN power; with the controller connected to an SCSI bus, the
FUSES LED lights when SCSI terminator power is present.
Because any device on the SCSI bus can provide TERMPWR, the FUSES
LED does not directly indicate the condition of the fuse. If the LED is not
lit during SCSI bus operation, the fuse should still be checked.
The MVME162LX Embedded Controller includes many resources for the
local processor. These include tick timers, software-programmable
hardware interrupts, a watchdog timer, and a local bus timeout.
Four 32-bit programmable tick timers with a 1 µs resolution are provided
in the MCchip and two 32-bit programmable tick timers are provided in the
optional VMEchip2. The tick timers can be programmed to generate
periodic interrupts to the processor.
Refer to the VMEchip2 and MCchip in the MVME162LX Embedded
Controller Programmer's Reference Guide for additional programming
information.
A watchdog timer is provided in both the MCchip 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 can be
programmed to generate a SYSRESET signal, local reset signal, or board
fail signal if they time out.
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