"Apparatus for storing ""Don't Care"" in a content addressable memory cell"
US5319590A · kind A · utility
62Cited by
1References
12Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Dec 4, 1992 |
| Grant date | Jun 7, 1994 |
| Priority date | — |
| Expiry date | Dec 4, 2012 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11C15/04
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A content addressable memory cell is able to store a state representing "Don't Care", by storing two bits of data. The "Don't Care" state is indicated by storing two identical bits corresponding to a predetermined value, so that the cell indicates a match regardless of the match data. When the cell is not in the "Don't Care" state, two complementary bits are stored, so that the cell indicates a match only when the match data matches the state of the first of the two bits.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.