Rom-based parallel digital arithmetic device

Details Rom-based parallel digital arithmetic device Rom-based parallel digital arithmetic device

G - Physics

06

F

354/151

G06F 7/552 (2006.01) G06F 1/035 (2006.01) G06F 7/52 (2006.01)

Patent

CA 1157160

79E69 A ROM-BASED PARALLEL DIGITAL ARITHMETIC DEVICE ABSTRACT OF INVENTION A fully-parallel digital arithmetic device for obtaining the square, C2, of a value, C, via parts of the value C and involving a reduction in memory requirements. Three square function ROM's are employed, one responsive to the most significant-bits half of a parallel input, the second ROM responsive to the least-significant bits half of the parallel input, and the third one responsive to the sum of said most significant bits and least-significant bits. The outputs of the square function ROM's are then combined and scaled to effect a square by parts of the applied input value, C. A pair of such arithmetic devices may be advantageously combined to economically effect the product AB of two values, A and B, in the manner of a quarter square multiplier.

363763

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