ACQUISITIONLOGIC AL81G通道模塊,AL81G中文PDF用戶手冊
行業(yè)標(biāo)準(zhǔn)SCSI總線。這些子系統(tǒng)可能包括：? 硬盤和軟盤驅(qū)動器? 流式磁帶機? 其他大容量存儲設(shè)備SCSI接口使用NCR 53C710 SCSI I/O實現(xiàn)控制器。53C710的SCSI時鐘輸入固定在50 MHz，以便具有更高的SCSI總線性能，并使當(dāng)MC68060啟動時，對53C710控制器進(jìn)行編程的軟件處理器速度變化。53C710的支持功能由PCCchip2提供。
ACQUISITIONLOGIC AL81G通道模塊請參閱53C710用戶指南和單板計算機詳細(xì)編程的程序員參考指南信息SCSI終止系統(tǒng)配置者必須確保SCSI總線正確連接兩端終止。MVME177上提供插座用于P2過渡板上的終端。如果SCSI總線結(jié)束在P2過渡板上，必須安裝終端電阻器安裝在P2過渡板上+SCSI總線的5V電源終端電源線和終端電阻通過MVME712過渡板上的保險絲和位于P2過渡板。當(dāng)?shù)刭Y源MVME177包括許多用于本地處理器的資源。其中包括：? 滴答計時器? 軟件可編程硬件中斷? 看門狗定時器可以對滴答定時器進(jìn)行編程，以產(chǎn)生周期性中斷到處理器。請參閱單芯片中的VMEchip2和PCCHIP2詳細(xì)信息的Board Computers程序員參考指南編程信息。
The MVME177 provides for mass storage subsystems through the
industry-standard SCSI bus. These subsystems may include:
? Hard and floppy disk drives
? Streaming tape drives
? Other mass storage devices
The SCSI interface is implemented using the NCR 53C710 SCSI I/O
controller.
The SCSI clock input to the 53C710 is fixed at 50 MHz, in order to
have higher SCSI bus performance, and to make it easier for
software to program the 53C710 controller when the MC68060
processor speed changes.
Support functions for the 53C710 are provided by the PCCchip2.
Refer to the 53C710 user's guide and to the Single Board Computers
Programmer's Reference Guide for detailed programming
information.
SCSI Termination
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.
Local Resources
The MVME177 includes many resources for the local processor.
These include:
? Tick timers
? Software programmable hardware interrupts
? Watchdog timerThe 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.
