当FIFO_RD接收能量流,表的第一-个存储单元的数据被复制到输出Q。接着,表中的每一项往下移动到下一个更低的存储单元。这从表中的第二项开始,它被移动到存储单元1。最后,指针减1。如果最终指针位置变为0,输出EM设为ON,也就是说,EM表示表是否为空。如果指示器大于零并且小于LEN指定的数值,FIFO_ RD向右传递能流。注意:–个FIFO表是-一个队列。–个LIFO表是-一个堆栈。
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