WOODWARD 5466-316伺服調(diào)速器，5466-316中文PDF使用手冊
MVME172LX包含共享板載DRAM，其基址是否可選擇軟件。車載處理器和非車載VMEbus設(shè)備在基本物理地址$00000000處看到這個(gè)本地DRAM，如下所示：由MVME172Bug固件編程。這可以通過以下方式更改：軟件到任何其他基址。參考MVME172 VME更多嵌入式控制器程序員參考指南信息如果MVME172LX試圖以不存在的方式訪問非車載資源位置，并且不是系統(tǒng)控制器，如果系統(tǒng)沒有全局總線超時(shí)，MVME172LX永遠(yuǎn)等待VMEbus周期完成。
WOODWARD 5466-316伺服調(diào)速器這將導(dǎo)致系統(tǒng)鎖定。只有一個(gè)系統(tǒng)可能缺少此全局總線超時(shí)的情況：當(dāng)MVME172LX不是系統(tǒng)控制器，也沒有全局總線系統(tǒng)中其他位置超時(shí)。可以在單個(gè)VME機(jī)箱中安裝多個(gè)MVME172LX。在里面一般支持硬件多處理器功能。注意，如果要在一個(gè)MVME945機(jī)箱，請勿在插槽中安裝MVME172LX12.IP模塊的高度可能導(dǎo)致間隙在該槽位置的困難。VMEbus上的其他MPU可以中斷、禁用、與、，并確定處理器的操作狀態(tài)。一個(gè)GCSR（全局控制/狀態(tài)寄存器）集包括四個(gè)位，其功能如下位置監(jiān)視器允許一個(gè)MVME172LX處理器廣播任何其他MVME172LX處理器發(fā)送信號。所有八個(gè)寄存器都是可從任何本地處理器以及VMEbus訪問。以下電路由固態(tài)保險(xiǎn)絲保護(hù)，固態(tài)保險(xiǎn)絲在過載條件，并在過載消除后自行重置：? 蘭奧伊? SCSI終端? 遠(yuǎn)程重置連接器? IndustryPack 5V? ±12V保險(xiǎn)絲LED亮起，表示所有保險(xiǎn)絲都在工作正確地如果保險(xiǎn)絲斷開，必須斷電幾分鐘才能恢復(fù)讓保險(xiǎn)絲返回閉合或短路狀態(tài)。
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.
