WOODWARD 5466-316伺服调速器，5466-316中文PDF使用手册

MVME172LX包含共享板载DRAM，其基址是否可选择软件。车载处理器和非车载VMEbus设备在基本物理地址$00000000处看到这个本地DRAM，如下所示：由MVME172Bug固件编程。这可以通过以下方式更改：软件到任何其他基址。参考MVME172 VME更多嵌入式控制器程序员参考指南信息如果MVME172LX试图以不存在的方式访问非车载资源位置，并且不是系统控制器，如果系统没有全局总线超时，MVME172LX永远等待VMEbus周期完成。

WOODWARD 5466-316伺服调速器这将导致系统锁定。只有一个系统可能缺少此全局总线超时的情况：当MVME172LX不是系统控制器，也没有全局总线系统中其他位置超时。可以在单个VME机箱中安装多个MVME172LX。在里面一般支持硬件多处理器功能。注意，如果要在一个MVME945机箱，请勿在插槽中安装MVME172LX12.IP模块的高度可能导致间隙在该槽位置的困难。VMEbus上的其他MPU可以中断、禁用、与、，并确定处理器的操作状态。一个GCSR（全局控制/状态寄存器）集包括四个位，其功能如下位置监视器允许一个MVME172LX处理器广播任何其他MVME172LX处理器发送信号。所有八个寄存器都是可从任何本地处理器以及VMEbus访问。以下电路由固态保险丝保护，固态保险丝在过载条件，并在过载消除后自行重置：❏ 兰奥伊❏ SCSI终端❏ 远程重置连接器❏ IndustryPack 5V❏ ±12V保险丝LED亮起，表示所有保险丝都在工作正确地如果保险丝断开，必须断电几分钟才能恢复让保险丝返回闭合或短路状态。

The MVME172LX contains shared onboard DRAM whose base address

is software-selectable. Both the onboard processor and offboard VMEbus

devices see this local DRAM at base physical address $00000000, as

programmed by the MVME172Bug firmware. This may be changed via

software to any other base address. Refer to the MVME172 VME

Embedded Controller Programmer’s Reference Guide for more

information.

If the MVME172LX tries to access offboard resources in a nonexistent

location and is not system controller, and if the system does not have a

global bus timeout, the MVME172LX waits forever for the VMEbus cycle

to complete. This will cause the system to lock up. There is only one

situation in which the system might lack this global bus timeout: when the

MVME172LX is not the system controller and there is no global bus

timeout elsewhere in the system.

Multiple MVME172LXs may be installed in a single VME chassis. In

general, hardware multiprocessor features are supported.

Note If you are installing multiple MVME172LXs in an

MVME945 chassis, do not install an MVME172LX in slot

12. The height of the IP modules may cause clearance

difficulties in that slot position.

Other MPUs on the VMEbus can interrupt, disable, communicate with,

and determine the operational status of the processor(s). One register of the

GCSR (global control/status register) set includes four bits that function as

location monitors to allow one MVME172LX processor to broadcast a

signal to any other MVME172LX processors. All eight registers are

accessible from any local processor as well as from the VMEbus.The following circuits are protected by solid-state fuses that open during

overload conditions and reset themselves once the overload is removed:

❏ LAN AUI

❏ SCSI terminator

❏ Remote reset connector

❏ IndustryPack 5V

❏ ±12V

The FUSES LED illuminates to indicate that all fuses are functioning

correctly. If a fuse opens, power must be removed for several minutes to

allow the fuse to return to a closed or shorted condition.