BENTLY 146031-01 3500/22M框架接口模塊
多路開(kāi)關(guān)。使用MVME712M模塊時(shí)，黃色當LAN通電時(shí)，MVME712M前面板上的LED（DS1）亮起可用，表明多路開(kāi)關(guān)良好。MVME177通過(guò)二極管提供SCSI終端電源以及位于P2適配器板上的1安培多功能開(kāi)關(guān)F1。如果多開(kāi)關(guān)熔斷（即打開(kāi)），SCSI設備可能無(wú)法運行或者可能功能不穩定。使用P2適配器板時(shí)通過(guò)MVME712M和SCSI總線(xiàn)連接到MVME712M，MVME712M前面板上的綠色LED（DS2）有SCSI終端電源時(shí)亮起。
BENTLY 146031-01 3500/22M框架接口模塊如果LED閃爍在SCSI總線(xiàn)操作期間，應檢查多路開(kāi)關(guān)。中止開(kāi)關(guān)S1當通過(guò)軟件啟用時(shí)，嵌入式前面板中止開(kāi)關(guān)在用戶(hù)可編程級別生成中斷。通常情況下用于中止程序執行并返回177Bug調試器固件位于MVME177 EPROM中。VMEchip2中的中止開(kāi)關(guān)中斷器是一個(gè)連接到中止開(kāi)關(guān)的邊緣敏感斷續器。這對斷續器進(jìn)行過(guò)濾，以消除開(kāi)關(guān)反彈。復位開(kāi)關(guān)S2嵌入式前面板重置開(kāi)關(guān)重置所有車(chē)載設備，如果板是系統控制器，則驅動(dòng)SYSRESET*。重置開(kāi)關(guān)可能被軟件禁用。VMEchip2包括全局和本地重置驅動(dòng)程序。什么時(shí)候該芯片作為VMEbus系統控制器、復位驅動(dòng)器運行通過(guò)斷言VMEbus信號提供全局系統重置系統重置*。系統重置*可由以下方式生成：? 復位開(kāi)關(guān)? 通電復位? 看門(mén)狗超時(shí)? LCSR中的控制位SYSRESET*保持斷言狀態(tài)至少200毫秒，如VMEbus規范。類(lèi)似地，VMEchip2提供輸入信號和控制位本地重置操作。通過(guò)設置控制位，軟件可以將電路板保持在重置狀態(tài)，從而禁用故障電路板系統正常運行。本地重置驅動(dòng)程序為即使VMEchip2不是系統控制器也啟用。A.
本地重置可通過(guò)以下方式生成：? 復位開(kāi)關(guān)? 通電復位? 看門(mén)狗超時(shí)? VMEbus系統重置*? GCSR中的控制位
the polyswitch. When using the MVME712M module, the yellow
LED (DS1) on the MVME712M front panel lights when LAN power
is available, indicating that the polyswitch is good.
The MVME177 provides SCSI terminator power through a diode
and a 1 amp polyswitch F1 located on the P2 Adapter Board. If the
polyswitch is blown (i.e., open), the SCSI devices may not operate
or may function erratically. When the P2 Adapter Board is used
with an MVME712M and the SCSI bus is connected to the
MVME712M, the green LED (DS2) on the MVME712M front panel
lights when there is SCSI terminator power. If the LED flickers
during SCSI bus operation, the polyswitch should be checked.ABORT Switch S1
When enabled by software, the recessed front panel ABORT switch
generates an interrupt at a user-programmable level. It is normally
used to abort program execution and return to the 177Bug
debugger firmware located in the MVME177 EPROMs.
The ABORT switch interrupter in the VMEchip2 is an
edge-sensitive interrupter connected to the ABORT switch. This
interrupter is filtered to remove switch bounce. RESET Switch S2
The recessed front panel RESET switch resets all onboard devices,
and drives SYSRESET* if the board is system controller. The RESET
switch may be disabled by software.
The VMEchip2 includes both a global and a local reset driver. When
the chip operates as the VMEbus system controller, the reset driver
provides a global system reset by asserting the VMEbus signal
SYSRESET*. A SYSRESET* may be generated by the following:
? RESET switch
? Power up reset
? Watchdog timeout
? Control bit in the LCSR
SYSRESET* remains asserted for at least 200 msec, as required by
the VMEbus specification.
Similarly, the VMEchip2 provides an input signal and a control bit
to initiate a local reset operation. By setting a control bit, software
can maintain a board in a reset state, disabling a faulty board from
participating in normal system operation. The local reset driver is
enabled even when the VMEchip2 is not the system controller. A
local reset may be generated by:
? RESET switch
? Power up reset
? Watchdog timeout
? VMEbus SYSRESET*
? Control bit in the GCSR
