Digital dividing apparatus using a look-up table

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G06F 752

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057294860

ABSTRACT:
The digital dividing apparatus includes a comparator for comprising a first input signal A with a second input signal B; a selector responsive to an output from the comparator for selecting a larger one out of the first and the second input signals; a priority encoder for outputting a priority signal in which only a bit corresponding to the most significant bit out of bits having a value of "1" of the selected input signal is set to a value "1"; a bit difference encoder responsive to the priority signal for producing a bit difference between the most significant bit of the selected input signal and the most significant bit out of bits having a value of "1" of the selected input signal; a first shifter for shifting the first input signal A to an upper side by the bit difference; a second shifter for shifting the second input signal B to an upper side by the bit difference; a first round-down circuit for rounding down lower bits of the signal shifted by the first shifter to produce a first m-bit round-down signal .alpha.; a second round-down circuit for rounding down lower bits of the signal shifted by the second shifter to produce a second n-bit round-down signal .beta.; a LUT memory for pro-storing a look-up table; and an LUT control circuit for controlling the LUT memory.

REFERENCES:
patent: 3917935 (1975-11-01), Lazecki
patent: 5020017 (1991-05-01), Ooms et al.
patent: 5339267 (1994-08-01), Ito
K.K. Maass, "Alignment of Operands Before and After 2-Bit Divide Loop", IBM Technical Disclosure Bulletin, vol. 23, No. 1, Jun. 1980, 249-251.
D.D. Sarma et al., "Measuring the Accuracy of ROM Reciprocal Tables", IEEE Computer Society/IEEE Technical Committee on VLSI, 11th Symposium on Computer Arithmetic, Jun. 29-Jul. 2, 1993, Windsor, Ontario, Canada, 95-102.
*EPO Communication dated Dec. 15, 1995 also supplied.
*European Search Report also supplied.

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