RELIANCE 801421-4R Analog quantity counting module

It is important that the SCSI bus be properly terminated at both ends. The MVME172LX main board provides terminators for the SCSI bus. The SCSI terminators are enabled/disabled by a jumper on header J12. If the SCSI bus ends at the MVME172LX, a jumper must be installed between J12 pins 1 and 2. The FUSES LED (part of DS2) on the MVME172LX front panel monitors the SCSI bus TERMPWR signal in addition to LAN power and IndustryPack power; the FUSES LED illuminates when all fuses are operational. The fuses are solid-state devices that reset when the short is removed. Because any device on the SCSI bus can provide TERMPWR, the FUSES LED does not directly indicate the condition of the fuse.

Local Resources 

The MVME172LX includes many resources for the local processor. These include tick timers, software-programmable hardware interrupts, a watchdog timer, and a local bus timeout. Programmable Tick Timers Four 32-bit programmable tick timers with 1µs resolution are provided in the MC2chip and two 32-bit programmable tick timers are provided in the optional VMEchip2. The tick timers may be programmed to generate periodic interrupts to the processor. Refer to the VMEchip2 and MC2chip in the MVME172 VME Embedded Controller Programmer’s Reference Guide for detailed programming information.

Watchdog Timer

 A watchdog timer 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 the MC2chip in the MVME172 VME Embedded Controller Programmer’s 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 MVME172LX which does not include the VMEbus interface ("No VMEbus Interface" option).

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