HONEYWELL CC-PDIH01 Digital quantity control module

The system configurer must ensure that the SCSI bus is properly terminated at both ends. On the MVME177, sockets are provided for the terminators on the P2 transition board. If the SCSI bus ends at the P2 transition board, then termination resistors must be installed on the P2 transition board. +5V power to the SCSI bus TERM power line and termination resistors is provided through a fuse on the MVME712 transition board, and a diode located on the P2 transition board.

The MVME177 includes many resources for the local processor. These include: ❏ Tick timers ❏ Software programmable hardware interrupts ❏ Watchdog timer 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.

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