ACQUISITIONLOGIC AL81G通道模块,AL81G中文PDF用户手册
行业标准SCSI总线。这些子系统可能包括：❏ 硬盘和软盘驱动器❏ 流式磁带机❏ 其他大容量存储设备SCSI接口使用NCR 53C710 SCSI I/O实现控制器。53C710的SCSI时钟输入固定在50 MHz，以便具有更高的SCSI总线性能，并使当MC68060启动时，对53C710控制器进行编程的软件处理器速度变化。53C710的支持功能由PCCchip2提供。
ACQUISITIONLOGIC AL81G通道模块请参阅53C710用户指南和单板计算机详细编程的程序员参考指南信息SCSI终止系统配置者必须确保SCSI总线正确连接两端终止。MVME177上提供插座用于P2过渡板上的终端。如果SCSI总线结束在P2过渡板上，必须安装终端电阻器安装在P2过渡板上+SCSI总线的5V电源终端电源线和终端电阻通过MVME712过渡板上的保险丝和位于P2过渡板。当地资源MVME177包括许多用于本地处理器的资源。其中包括：❏ 滴答计时器❏ 软件可编程硬件中断❏ 看门狗定时器可以对滴答定时器进行编程，以产生周期性中断到处理器。请参阅单芯片中的VMEchip2和PCCHIP2详细信息的Board Computers程序员参考指南编程信息。
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.
