MAX-503-10076
介绍
本章提供在系统中使用MVME所需的信息
配置这包括对交换机和LED、内存的描述
地图和模块的软件初始化。
交换机和LED
MVME前面板具有中止和复位开关以及八个LED
（发光二极管）指示灯（FAIL、STAT、RUN、SCON、LAN、FUSE、SCSI、，
VME）。
中止开关（S1）
当由软件启用时，中止开关在用户可编程级别生成中断。它通常用于中止程序执行和
返回MVME EPROM中的Bug调试器固件
和闪存。
MCchip ASIC中的中止开关中断器是边缘敏感型
中断器连接到中止开关。该中断器被过滤为
拆下开关弹跳。
复位开关（S2）
复位开关复位所有车载设备；如果
MVME是系统控制器。复位开关可通过以下方式禁用
软件
VMEchip2包括全局和本地重置驱动程序。当
VMEchip2作为VMEbus系统控制器、复位驱动程序运行
通过断言VMEbus信号SYSRESET*提供全局系统重置。A.
SYSRESET*可由复位开关、通电复位、
看门狗超时，或通过VMEchip2中LCSR中的控制位。系统重置*
按照VMEbus规范的要求，保持断言至少200 ms。
类似地，VMEchip2提供输入信号和控制位以启动
本地重置操作。通过设置控制位，软件可以维护电路板
在复位状态下，禁止故障板参与正常系统
活动即使VMEchip2不是
操作说明
3-2用户手册
3.
系统控制器。可通过重置开关生成本地重置
通电重置、看门狗超时、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.