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US 4,208,722 AGranted
Floating point data processing system
AssigneeData General Corporation
InventorsEdward J. Rasala, Charles J. Young
Life of this patent
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Abstract
A digital data multiplier, particularly useful in floating point processing systems, wherein a first digital word representing a first value is multiplied by successive groups of bits of a second digital word representing a second value to form successive partial products which are combined to form successive partial sums, the final sum of all such combined partial sums producing a digital word representing the final product of the first and second values.
Claims9
A digital data multiplier for providing the product of two values expressed in digital form comprising
- means for providing a first digital data word representing a first of said two values;
- means for providing a second digital data word representing a second of said two values;
- means for providing successive groups of data bits of said second data word;
- control logic means responsive to said successive groups of data bits for providing successive multiplier control signals;
- shifter means for successively shifting the data bits of said first data word by a first selected number of positions to produce a first shifted data word and by a second selected number of positions to produce a second shifted data word, the selection of said first and second selected number of positions being successively controlled by said successive multiplier control signals;
- first combining means responsive to said first and second shifted words for producing a single word which represents successive partial products of said first data word and said successive groups of bits of said second data word;
- second combining means responsive to said successive partial products for producing an intermediate product word which represents the sum of the successive partial products produced by said first combining means, said second combining means providing a final intermediate product word which directly represents the final product of said two values.
4 more elements
Dependencies are inferred from the claim text.