所有的位都向右移。LSB和数据位进行XOR运算，结果是:和位1原来的内容XOR(结果放在位0)，和位14原来的内容XOR(结果放在位13)，最后LSB被移进位15。这样重复执行，直到一个信息里的所有数据位都被处理完。CRC-16软件执行将在下一节中叙述。
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