1.FIFO_ RD复制表的顶部存储单元的值到输出参数Q中。然后必须有另外的逻辑程序输入数据到输入存储单元中。2.表中剩余的项复制到表中更低的位置。3.FIFO_ _RD将指针减1.4.FIFO_ RD执行时,步骤1,2和3重复执行,直到表为空(PTR=0)。当表满时指针首尾不重合。
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