Browse Prior Art Database

Parity Predict Lookahead

IP.com Disclosure Number: IPCOM000067555D
Original Publication Date: 1979-Aug-01
Included in the Prior Art Database: 2005-Feb-20

Publishing Venue

IBM

Related People

Authors:
Elmergreen, JA Wottreng, AH [+details]

Abstract

The parity predict circuit set forth in the IBM Technical Disclosure Bulletin 17, 2068 (December 1974) generates transmitted carries for each bit position. The transmitted carries are then exclusive ORed to form odd and even carry signals. These carry signals are then used to form the predicted parity for the specific arithmetic or logical operation. An improvement is provided in the present arrangement by not using the carry in signal for generating the transmitted carries so as to enable the exclusive OR of the transmitted carries to be generated earlier in time.