Programmable logic device including bi-directional shift register
US6646465B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Feb 7, 2002 |
| Grant date | Nov 11, 2003 |
| Priority date | — |
| Expiry date | Feb 7, 2022 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K19/17736
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A programmable logic device may include a programmable interconnect structure and a plurality of configurable logic elements including data latches interconnected by the interconnect structure. At least one of the configurable logic elements may be configurable as both a shift register and a lookup table. Also, the shift register may be enabled to operate as a bi-directional shift register by the inclusion of a first circuit for configuring the data latches either as series-connected inverters during a shift operation or as data latches after each shift operation. A second circuit for selecting a direction of shifting may also be included, as well as a third circuit for supplying data to the input of the shift register as determined by the direction of shifting.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.