Parallelized borrow look ahead subtractor

Details Parallelized borrow look ahead subtractor Parallelized borrow look ahead subtractor

1993-09-16

1995-01-31

Malzahn, David H.

Boots, shoes, and leggings

G06F 750

Patent

active

053863771

ABSTRACT:
Therefore, according to the present invention, borrow look ahead circuitry suitable for use in a FIFO memory allows the difference between two values to be quickly generated and this difference compared to a third value. A borrow look ahead element generates a plurality of borrow signals which are supplied to CORRESPONDING full subtractors of a subtractor section in a parallel fashion. This parallel propagation reduces gates delays between the subtractors, resulting in faster operation. Thus, the time required to supply the difference to a comparator is minimized. Adding additional levels to the borrow look ahead element further increases the speed of the borrow look ahead circuitry.

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