GE CRS-10-MB

正常程序块时序

中断驱动逻辑在系统内所有的用户程序中具有最高的优先级。CPU优先执行中断触发的程序块。在中断驱动的程序块执行完毕后，CPU再接着执行其他程序。如果正在执行中断块时收到其他的中断指令，CPU会将这些指令放到完成本次中断后需要:执行的任务队列中。定时中断驱动程序块排在I/0驱动程序块或模块驱动程序块前面。I/0驱动程序块或模块驱动程序块按收到的顺序排队。如果中断驱动块已经在队列中了，调用程序块的其他中断会被屏蔽掉。

优先级程序块时序

优先级时序允许你为每一个触发指定一个优先级。优先级数值范围为1~16，1优先级高。单个模块可以有多个优先级不同的中断，也可以有多个优先级相同的中断。

将接收到的中断级别和正在执行的程序块的中断级别进行比较后，会按如下方式执行程序块:

■如果接收到的中 断级别高于正在执行的程序块的中断级别，则停止执行当前程序块，转而执行和新收到的中断相关的程序块。

■如果接收到的中断级别等同于正在执行的程序块的中断级别，则继续执行当前程序块。将新收到的中断放入队列中。

■如果接收到的中断级别低于正在执行的程序块的中断级别，则将新收到的中断放入队列中。

CPU执行完一一个中断程序块后，将执行和队列中级别最高的中断相关联的程序块。如果CPU在执行某个中断程序块的过程中接收到更高级别的中断，则在执行完和该中断相关的程序块后，继续执行未执行完的那个程序块。

如果队列中的多个程序块有相同的中断优先级，则执行顺序不确定。

注意:某些函数， 如DOIO, BUS_ RD, BUS_WRT, COMMREQ和某些SVC_ REQ函数会产生一些具有相同优先级的其他队列程序块。

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