DS200TCEBG1ACE燃機(jī)電氣,GE數(shù)據(jù)庫
系統(tǒng)注意事項(xiàng)MVME197LE需要從VMEbus背板。連接器P2還用于32位傳輸，對于擴(kuò)展尋址的上8個(gè)地址行模式如果沒有主板，MVME197LE可能無法正常工作連接至VMEbus背板的連接器P1和P2。MVME197LE是作為VMEbus主設(shè)備還是作為VMEbus從設(shè)備運(yùn)行，它配置為32位地址和32位數(shù)據(jù)（A32/D32）。然而，它在某些地址范圍內(nèi)處理A16或A24設(shè)備。
DS200TCEBG1ACE燃機(jī)電氣D8和/或系統(tǒng)中的D16設(shè)備必須由軟件處理。參考存儲(chǔ)器MVME197LE、MVME197DP和MVME197SP單板中的映射計(jì)算機(jī)程序員參考指南。MVME197LE包含共享板載DRAM，其基址為軟件可選。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MVME197Bug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MVME197LE、MVME197DP、，和MVME197SP單板計(jì)算機(jī)程序員參考指南細(xì)節(jié)。
如果MVME197LE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)，MVME197LE永遠(yuǎn)等待VMEbus循環(huán)完成這將導(dǎo)致系統(tǒng)掛起。只有一種情況其中系統(tǒng)可能缺少此全局總線超時(shí)：當(dāng)MVME197LE不是系統(tǒng)控制器，沒有全局總線超時(shí)系統(tǒng)中的其他位置。多個(gè)MVME197LE模塊可以配置到單個(gè)VME卡中籠子通常，支持硬件多處理器功能。VMEbus上的其他MPU可以中斷、禁用、與和通信確定RISC處理器的運(yùn)行狀態(tài)。一個(gè)
GCSR集包括四個(gè)位，用作位置監(jiān)視器，允許一個(gè)MVME197LE處理器向其他MVME197LE廣播信號(hào)處理器（如有）。所有八個(gè)寄存器都可以從任何本地處理器訪問以及從VMEbus。
MVME197LE為以太網(wǎng)LAN收發(fā)器提供+12 Vdc電源通過MVME197LE模塊上的1安培保險(xiǎn)絲（F2）進(jìn)行接口。如果以太網(wǎng)收發(fā)器無法工作，請檢查保險(xiǎn)絲。當(dāng)使用MVME712M過渡模塊，MVME712M上的黃色LED（DS1當(dāng)LAN電源可用時(shí)，前面板亮起，表明保險(xiǎn)絲已斷開
System Considerations
The MVME197LE needs to draw power from both connectors P1 and P2 of the
VMEbus backplane. Connector P2 is also used for the upper 16 bits of data for
32-bit transfers, and for the upper 8 address lines for the extended addressing
mode. The MVME197LE may not operate properly without its main board
connected to connectors P1 and P2 of the VMEbus backplane.
Whether the MVME197LE operates as a VMEbus master or as a VMEbus slave,
it is configured for 32 bits of address and for 32 bits of data (A32/D32).
However, it handles A16 or A24 devices in certain address ranges. D8 and/or
D16 devices in the system must be handled by software. Refer to the memory
maps in the MVME197LE, MVME197DP, and MVME197SP Single Board
Computers Programmer’s Reference Guide.
The MVME197LE contains shared onboard DRAM whose base address is
software-selectable. Both the onboard processor and off-board VMEbus
devices see this local DRAM at base physical address $00000000, as
programmed by the MVME197Bug firmware. This may be changed, by
software, to any other base address. Refer to the MVME197LE, MVME197DP,
and MVME197SP Single Board Computers Programmer’s Reference Guide for
details.
If the MVME197LE tries to access off-board resources in a non-existent
location, and is not the system controller, and if the system does not have a
global bus timeout, the MVME197LE waits forever for the VMEbus cycle to
complete. This would cause the system to hang up. There is only one situation
in which the system might lack this global bus timeout: when the
MVME197LE is not the system controller and there is no global bus timeout
elsewhere in the system.Multiple MVME197LE modules may be configured into a single VME card
cage. In general, hardware multiprocessor features are supported.
Other MPUs on the VMEbus can interrupt, disable, communicate with and
determine the operational status of the RISC processor(s). One register of the
GCSR set includes four bits which function as location monitors to allow one
MVME197LE processor to broadcast a signal to other MVME197LE
processors, if any. All eight registers are accessible from any local processor as
well as from the VMEbus.
The MVME197LE provides +12 Vdc power to the Ethernet LAN transceiver
interface through a 1 amp fuse (F2) located on the MVME197LE module. If the
Ethernet transceiver fails to operate, check the fuse. When using the
MVME712M transition module, the yellow LED (DS1) on the MVME712M
front panel lights when LAN power is available, indicating that the fuse is
good
