BENTLY 1900/55 1900/55-0Z-01-01-01框架MVME177前面板上有八个LED：FAIL、STAT、，RUN、SCON、LAN、+12V（LAN电源）、SCSI和VME。这个每个LED的用途如下：❏ BRDFAIL时，红色故障LED（DS1的一部分）亮起信号线激活❏ MC68060状态行在MVME177上解码为驱动黄色STAT（status）LED（DS1的一部分）。在这种情况下，来自处理器的暂停条件将点亮LED❏ 当本地总线连接时，绿色运行LED（DS2的一部分）亮起TIP*信号线低。
BENTLY 1900/55 1900/55-0Z-01-01-01框架这表示本地总线之一主机正在执行本地总线循环❏ 当出现以下情况时，绿色SCON LED（DS2的一部分）亮起MVME177中的VMEchip2是VMEbus系统控制器❏ 当LAN芯片启动时，绿色LAN LED（DS3的一部分）亮起是本地总线主节点❏ MVME177向以太网提供+12V电源通过保险丝的收发器接口。绿色+12V（LAN电源）LED（DS3的一部分）在电源可用时亮起收发器接口❏ 当SCSI芯片启动时，绿色SCSI LED（DS4的一部分）亮起是本地总线主节点❏ 当电路板启动时，绿色VME LED（DS4的一部分）亮起使用VMEbus（VMEbus AS*由VMEchip2）或当VMEbus访问电路板时（VMEchip2是本地总线主）内存映射关于记忆有两种可能的观点地图：❏ 本地总线主节点查看的所有资源的映射（本地总线内存映射）❏ VMEbus查看的车载资源映射主机（VMEbus内存映射）本地总线内存映射本地总线内存映射通过以下方式拆分为不同的地址空间：传输类型（TT）信号。当地资源对正常访问和中断确认代码。VMEchip2中有一些地址转换功能。这允许在同一VMEbus上使用不同的不同VMEbus主机查看的虚拟本地总线图
There are eight LEDs on the MVME177 front panel: FAIL, STAT,
RUN, SCON, LAN, +12V (LAN power), SCSI, and VME. The
purpose of each LED is as follows:
❏ The red FAIL LED (part of DS1) lights when the BRDFAIL
signal line is active
❏ The MC68060 status lines are decoded, on the MVME177, to
drive the yellow STAT (status) LED (part of DS1). In this case,
a halt condition from the processor lights the LED
❏ The green RUN LED (part of DS2) lights when the local bus
TIP* signal line is low. This indicates one of the local bus
masters is executing a local bus cycle
❏ The green SCON LED (part of DS2) lights when the
VMEchip2 in the MVME177 is the VMEbus system controller
❏ The green LAN LED (part of DS3) lights when the LAN chip
is local bus master
❏ The MVME177 supplies +12V power to the Ethernet
transceiver interface through a fuse. The green +12V (LAN
power) LED (part of DS3) lights when power is available to
the transceiver interface
❏ The green SCSI LED (part of DS4) lights when the SCSI chip
is local bus master
❏ The green VME LED (part of DS4) lights when the board is
using the VMEbus (VMEbus AS* is asserted by the
VMEchip2) or when the board is accessed by the VMEbus
(VMEchip2 is the local bus master)Memory Maps
There are two possible perspectives or points of view for memory
maps:
❏ The mapping of all resources as viewed by local bus masters
(local bus memory map)
❏ The mapping of onboard resources as viewed by VMEbus
Masters (VMEbus memory map)
Local Bus Memory Map
The local bus memory map is split into different address spaces by
the transfer type (TT) signals. The local resources respond to the
normal access and interrupt acknowledge codes.
There is some address translation capability in the VMEchip2. This
allows multiple MVME177s on the same VMEbus with different
virtual local bus maps as viewed by different VMEbus masters
