Bit masking compare circuit
US5059942A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 3, 1990 |
| Grant date | Oct 22, 1991 |
| Priority date | — |
| Expiry date | Jan 3, 2010 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F9/30021
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A masked compare circuit for comparing a first N-bit dataword to a second N-bit dataword, the circuit including a decoder for receiving an M-bit mask code and generating an output signal identifying a bit position, K, derived from the M-bit mask code, M and K being positive integers; and a comparator module responsive to the decoder output signal for comparing the N-K+1 most significant bits of the first dataword to corresponding bits of the second dataword, the comparator module generating an output signal having a first value when all of the compared bits are the same and having a second value when any of the compared bits are different.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.