LT8978b,V1工控备件,ABB英文说明
中止开关（S1）中止开关位于LED夹层上。当由激活时软件中，中止开关可以从基座生成中断信号板到处理器。中断通常用于中止程序执行并将控制返回到位于MVME2603/2604 EPROM和闪存。中断信号通过ISA总线中断线IRQ8到达处理器模块∗. 信号也可在Z8536 CIO设备的引脚PB7处使用，该设备处理各种状态信号、串行输入/输出线和计数器。
LT8978b,V1工控备件连接到中止开关的断路器是一个边缘敏感电路，过滤以消除开关反弹。
复位开关（S2）复位开关位于LED夹层上。复位开关重置所有车载设备；它还驱动系统重置∗ 如果MVME2603/2604是系统控制器。前面板指示灯（DS1–DS6）MVME2603/2604前面板上有六个LED：CHS、BFL、CPU、，PCI、FUS和SYS。
❏ CHS（DS1，黄色）。检查停止；由MPC603/604状态驱动MVME2603/2604上的线路。当停止条件从检测到处理器。
❏ BFL（DS2，黄色）。电路板故障；BRD故障时亮起∗ 信号线路处于活动状态。
❏ CPU（DS3，绿色）。CPU活动；DBB时亮起∗ （数据总线忙）处理器总线上的信号线处于活动状态。
❏ PCI（DS4，绿色）。PCI活动；当IRDY∗ （发起人就绪）PCI总线上的信号线处于活动状态。这表明PCI夹层或承载板（如果已安装）处于活动状态。
❏ FUS（DS5，绿色）。保险丝正常；+5V DC、+12V DC和–从基板到过渡电路提供12V直流电源模块和远程设备。注意，因为FUS LED监控多个电压的状态在MVME2603/2604中，它不直接指示状况任何单个保险丝。如果LED闪烁或熄灭，请检查所有保险丝（多开关）。
❏ SYS（DS6，绿色）。系统控制器；当宇宙发光时MVME2603/2604中的ASIC是VMEbus系统控制器。
ABORT Switch (S1)
The ABORT switch is located on the LED mezzanine. When activated by
software, the ABORT switch can generate an interrupt signal from the base
board to the processor. The interrupt is normally used to abort program
execution and return control to the debugger firmware located in the
MVME2603/2604 EPROM and Flash memory. The interrupt signal
reaches the processor module via ISA bus interrupt line IRQ8∗. The signal
is also available at pin PB7 of the Z8536 CIO device, which handles
various status signals, serial I/O lines, and counters.
The interrupter connected to the ABORT switch is an edge-sensitive circuit,
filtered to remove switch bounce.
RESET Switch (S2)
The RESET switch is located on the LED mezzanine. The RESET switch
resets all onboard devices; it also drives a SYSRESET∗ signal if the
MVME2603/2604 is the system controller.Front Panel Indicators (DS1 – DS6)
There are six LEDs on the MVME2603/2604 front panel: CHS, BFL, CPU,
PCI, FUS, and SYS.
❏ CHS (DS1, yellow). Checkstop; driven by the MPC603/604 status
lines on the MVME2603/2604. Lights when a halt condition from
the processor is detected.
❏ BFL (DS2, yellow). Board Failure; lights when the BRDFAIL∗ signal
line is active.
❏ CPU (DS3, green). CPU activity; lights when the DBB∗ (Data Bus
Busy) signal line on the processor bus is active.
❏ PCI (DS4, green). PCI activity; lights when the IRDY∗ (Initiator
Ready) signal line on the PCI bus is active. This indicates that the
PCI mezzanine or carrier board (if installed) is active.
❏ FUS (DS5, green). Fuse OK; lights when +5V DC, +12V DC, and
–12V DC power is available from the base board to the transition
module and remote devices.
Note Because the FUS LED monitors the status of several voltages on
the MVME2603/2604, it does not directly indicate the condition
of any single fuse. If the LED flickers or goes out, check all the
fuses (polyswitches).
❏ SYS (DS6, green). System Controller; lights when the Universe
ASIC in the MVME2603/2604 is the VMEbus system controller.
