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    • 35. 发明授权
    • Fixed-point data/floating-point data converting apparatus
    • 定点数据/浮点数据转换装置
    • US4631696A
    • 1986-12-23
    • US573347
    • 1984-01-24
    • Tsutomu Sakamoto
    • Tsutomu Sakamoto
    • G06F7/00G06F7/74G06F7/76H03M7/24G06F7/38G06F5/00
    • G06F7/74H03M7/24
    • A fixed-point data/floating-point data converting apparatus has: a priority encoder with input terminals respectively receiving output signals from logic gates (first logic gates) for use in detecting whether or not all of the digits fixed-point data are "0", to obtain a number of continuous "zero" digits from the most significant digit of the fixed-point data, in accordance with the contents of the signals received thereby; a shifter for shifting the fixed-point data to the left by the number of digits of continuous "zero" digits, thereby obtaining a mantissa part; an adder for subtracting the number of continuous "zero" digits from a reference value, thereby obtaining an exponent part; and a data selector for generating the floating-point data in accordance with the subtraction results from the adder, the shift results from the shifter, all-zero data, and an output signal from the logic gate (first logic gate) for detecting whether or not all digits of the fixed-point data are "0", in response to the output signals from the logic gates (second logic gates). In this converting apparatus, the data selector selects the all-zero data, as floating-point data, when all of the digits of the fixed-point data are "0". Otherwise, the data selector selects, as floating-point data, data including the subtraction results supplied from the adder and the shift results supplied from the shifter.
    • 定点数据/浮点数据转换装置具有:优先编码器,其输入端分别接收来自逻辑门​​(第一逻辑门)的输出信号,用于检测所有数字定点数据是否为“0” “,根据由此接收到的信号的内容,从定点数据的最高有效位获得多个连续的”零“数字; 移位器,用于将定点数据向左移动连续“零”数字的位数,从而获得尾数部分; 一个加法器,用于从参考值中减去连续的“零”数字的数目,从而获得指数部分; 和用于根据加法器的减法结果产生浮点数据的数据选择器,来自移位器的移位结果,全零数据以及来自逻辑门​​(第一逻辑门)的输出信号,用于检测是否 响应于来自逻辑门​​(第二逻辑门)的输出信号,定点数据的全部数字都不是“0”。 在该转换装置中,当定点数据的所有数字为“0”时,数据选择器选择全零数据作为浮点数据。 否则,数据选择器选择包括从加法器提供的减法结果和从移位器提供的移位结果的数据作为浮点数据。