當(dāng)FIFO_RD接收能量流，表的第一-個存儲單元的數(shù)據(jù)被復(fù)制到輸出Q。接著，表中的每一項往下移動到下一個更低的存儲單元。這從表中的第二項開始，它被移動到存儲單元1。最后，指針減1。如果最終指針位置變?yōu)?,輸出EM設(shè)為ON，也就是說，EM表示表是否為空。如果指示器大于零并且小于LEN指定的數(shù)值，F(xiàn)IFO_ RD向右傳遞能流。注意:–個FIFO表是-一個隊列。–個LIFO表是-一個堆棧。

 

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