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MVME709-1
介紹
本章提供在系統(tǒng)中使用MVME所需的信息
配置這包括對交換機和LED、內(nèi)存的描述
地圖和模塊的軟件初始化。
交換機和LED
MVME前面板具有中止和復位開關以及八個LED
（發(fā)光二極管）指示燈（FAIL、STAT、RUN、SCON、LAN、FUSE、SCSI、，
VME）。
中止開關（S1）
當由軟件啟用時，中止開關在用戶可編程級別生成中斷。它通常用于中止程序執(zhí)行和
返回MVME EPROM中的Bug調(diào)試器固件
和閃存。
MCchip ASIC中的中止開關中斷器是邊緣敏感型
中斷器連接到中止開關。該中斷器被過濾為
拆下開關彈跳。
復位開關（S2）
復位開關復位所有車載設備；如果
MVME是系統(tǒng)控制器。復位開關可通過以下方式禁用
軟件
VMEchip2包括全局和本地重置驅(qū)動程序。當
VMEchip2作為VMEbus系統(tǒng)控制器、復位驅(qū)動程序運行
通過斷言VMEbus信號SYSRESET*提供全局系統(tǒng)重置。A.
SYSRESET*可由復位開關、通電復位、
看門狗超時，或通過VMEchip2中LCSR中的控制位。系統(tǒng)重置*
按照VMEbus規(guī)范的要求，保持斷言至少200 ms。
類似地，VMEchip2提供輸入信號和控制位以啟動
本地重置操作。通過設置控制位，軟件可以維護電路板
在復位狀態(tài)下，禁止故障板參與正常系統(tǒng)
活動即使VMEchip2不是
操作說明
3-2用戶手冊
3.
系統(tǒng)控制器?？赏ㄟ^重置開關生成本地重置
通電重置、看門狗超時、VMEbus SYSRESET*、或中的控制位
GCSR。

Introduction This chapter provides information necessary to use the MVME in a system configuration. This includes a description of the switches and LEDs, memory maps, and software initialization of the module. Switches and LEDs The MVME front panel has ABORT and RESET switches and eight LED (light-emitting diode) indicators (FAIL, STAT, RUN, SCON, LAN, FUSE, SCSI, VME). ABORT Switch (S1) When enabled by software, the ABORT switch generates an interrupt at a userprogrammable level. It is normally used to abort program execution and return to the Bug debugger firmware located in the MVME EPROM and Flash memory. The ABORT switch interrupter in the MCchip ASIC is an edge-sensitive interrupter connected to the ABORT switch. This interrupter is filtered to remove switch bounce. RESET Switch (S2) The RESET switch resets all onboard devices; it also drives SYSRESET* if the MVME is the system controller. The RESET switch may be disabled by software. The VMEchip2 includes both a global and a local reset driver. When the VMEchip2 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 RESET switch, a power-up reset, a watchdog timeout, or by a control bit in the LCSR in the VMEchip2. SYSRESET* remains asserted for at least 200 ms, 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 Operating Instructions 3-2 User’s Manual 3 system controller. A local reset may be generated by the RESET switch, a power-up reset, a watchdog timeout, a VMEbus SYSRESET*, or a control bit in the GCSR.