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.下载并测试应用程序。
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