Multiply-divide unit

Details Multiply-divide unit Multiply-divide unit

1976-10-15

1977-12-27

Smith, Jerry

Boots, shoes, and leggings

364766, G06F 754

Patent

active

040656667

ABSTRACT:
Apparatus and method for selectively multiplying or dividing operands by combined add-shift right operations or subtract-shift left operations, the latter preceded and followed by a pre-shift to the left and post-shift to the right. An array of register stages, including an adder, is arranged to shift the register contents and adder output signals selectively right or left, depending on the operation and the value of the least significant bit of the controlling operand. The loading of operands and retrieval of results can be accomplished as if the unit were a memory device, making it especially useful for small computers and microprocessors. The array is structured to permit cascading identical units in a regular manner to handle operands of any desired length. Any unit can be the left most, right most, or intermediate unit when cascaded.

REFERENCES:
patent: 3795880 (1974-03-01), Singh et al.
patent: 3803393 (1974-04-01), Wang
patent: 3956621 (1976-05-01), Booth
patent: 3961750 (1976-06-01), Dao

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