DS200TCEBG1ACE燃机电气,GE数据库
系统注意事项MVME197LE需要从VMEbus背板。连接器P2还用于32位传输，对于扩展寻址的上8个地址行模式如果没有主板，MVME197LE可能无法正常工作连接至VMEbus背板的连接器P1和P2。MVME197LE是作为VMEbus主设备还是作为VMEbus从设备运行，它配置为32位地址和32位数据（A32/D32）。然而，它在某些地址范围内处理A16或A24设备。
DS200TCEBG1ACE燃机电气D8和/或系统中的D16设备必须由软件处理。参考存储器MVME197LE、MVME197DP和MVME197SP单板中的映射计算机程序员参考指南。MVME197LE包含共享板载DRAM，其基址为软件可选。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MVME197Bug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MVME197LE、MVME197DP、，和MVME197SP单板计算机程序员参考指南细节。
如果MVME197LE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，MVME197LE永远等待VMEbus循环完成这将导致系统挂起。只有一种情况其中系统可能缺少此全局总线超时：当MVME197LE不是系统控制器，没有全局总线超时系统中的其他位置。多个MVME197LE模块可以配置到单个VME卡中笼子通常，支持硬件多处理器功能。VMEbus上的其他MPU可以中断、禁用、与和通信确定RISC处理器的运行状态。一个
GCSR集包括四个位，用作位置监视器，允许一个MVME197LE处理器向其他MVME197LE广播信号处理器（如有）。所有八个寄存器都可以从任何本地处理器访问以及从VMEbus。
MVME197LE为以太网LAN收发器提供+12 Vdc电源通过MVME197LE模块上的1安培保险丝（F2）进行接口。如果以太网收发器无法工作，请检查保险丝。当使用MVME712M过渡模块，MVME712M上的黄色LED（DS1当LAN电源可用时，前面板亮起，表明保险丝已断开
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
