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    • 32. 发明授权
    • FOD (first-one-detector) circuit
    • FOD(第一检测器)电路
    • US06195673B1
    • 2001-02-27
    • US09154098
    • 1998-09-16
    • Sung-Soo Park
    • Sung-Soo Park
    • G06F700
    • G06F7/74
    • A FOD (First-One-Detector) circuit for detecting the number of leading zeros counted from a most significant bit to a first one in a binary number includes a plurality of sub-FODs respectively having a plurality of unit blocks connected in cascade, when a fraction input is less than 16 bits, depending on the number of bits and respectively provided with a plurality of transmission transistors. When the fraction input is more than 16 bits, the plurality of sub-FODs respectively output the number of leading zeros with regard to predetermined bits of fraction inputs, and a determinative signal for determining whether the fraction inputs are all zeros. The sub-FODs respectively further include an encoding circuit for encoding the number of leading zeros outputted from the plurality of sub-FODs and the determinative signal and outputting the resultant number of leading zeros. The FOD circuit employs a fewer number of transistors and realizes a faster normalization by a quick detection of leading zeros.
    • 用于检测以二进制数从最高有效位计数到前一个的前导零数的FOD(第一检测器)电路包括分别具有串联连接的多个单位块的多个子FOD, 分数输入小于16位,这取决于位数,并分别设置有多个传输晶体管。 当分数输入大于16位时,多个子FOD分别输出关于分数输入的预定位的前导零的数量,以及用于确定分数输入是否全为零的确定信号。 子FOD还包括编码电路,用于对从多个子FOD输出的前导零的数量和确定信号进行编码,并输出合成的前导零数。 FOD电路使用较少数量的晶体管,并通过快速检测前导零来实现更快的归一化。