GE V7768-312000

GE V7768-312000

VME总线中断

内存交换网板有一个单独的可编程VME总线中断输出,它可以用来触发执行一个逻辑块。内存交换网板能对不同的事件产生中断，比如奇偶错误，信号监测错误，或无赖数据包故障。完整的列表见4-3页“VME总线中断事件”。

如果你的应用程序使用VME总线中断，它必须向模板写数数据来选择中断源，并且在它们发生时作出响应。为了控制哪个事件会产生一个中断，需要向本地中断允许寄存器(LIER-区域2， 偏移14h) 写数据。一旦中断产生，逻辑必须读取本地中断允许寄存器(LER-区域2，偏移10h)来确定中断产生的原因(可能不是一个)并且作出适当的响应。

注意:如果CPU在停止模式下有VME中断产生，相关的中断块不会因为中断的产生而执行。

以下是使用VME总线中断过程中包含的一些步骤的总结:

1.决定你想为哪个事件产生一个中断。( 见“VME总线中断事件”4-3页)

2.开发中断初始化逻辑。

3.开发中断处理逻辑块。

4.将模板硬件配置中中断参数设为允许。

5.使中断和逻辑块相关联。

6.并测试应用程序。

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