Don't.sub.-- care logic
US5892687A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 12, 1997 |
| Grant date | Apr 6, 1999 |
| Priority date | — |
| Expiry date | Mar 12, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F30/327
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A form of symbolic logic gate, referred to as don't.sub.-- care logic, provides a construct that does not have a technology primitive correspondent, and that is useful for carrying valuable additional information to logic synthesis and/or logic optimization processes. Thus, a logic optimization process may proceed more effectively when presented with such don't.sub.-- care information because, e.g. overlapping combinational logic is simplified (but not always eliminated) and dependency (i.e. shared combinational logic) is resolved between the data input and the enable input. The don't.sub.-- care gate is readily generalized, such that it can be applied for any technology primitives that have an enable line input, where there is potential shared combinational logic between the data input (or any inputs) and the enable input. Such category may include technology primitives, such as a latch, a D.sub.-- flip.sub.-- flop, and a tri-state element.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.