超量程信号表示溢出状况，可由最高有效位来确定是下溢还是上溢。
An out-of-range signal indicates an overflow condition, which can be used with the most significant bit to determine low or high overflow.
超量程(otr)信号表示溢出状况，可由最高有效位来确定是下溢还是上溢。
An out-of-range signal (OTR) indicates an overflow condition which can be used with the most significant bit to determine low or high overflow.
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