Dedicated logic cells employing configurable logic and dedicated logic functions
US7439768B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 9, 2006 |
| Grant date | Oct 21, 2008 |
| Priority date | — |
| Expiry date | Oct 9, 2026 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K19/17728
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A dedicated logic cell in a programmable logic structure is described that comprises the following primary components: a configurable logic function or look-up table (LL), a dedicated logic function (DL), a sequential logic function (LS), and a control logic function (LC). In this illustration, the dedicated logic cell comprises two configurable logic functions, two sequential logic functions, a dedicate logic function, and a control logic function. In some embodiments, the configurable logic function comprises a plurality of look-up tables coupled to a multiplexer with configurable bits that is capable to perform a four 4-input look-up table, one 6-input look-up tables or a 4-to-1 multiplexer. In the first function that operates as the four 4-input look-up table, the dedicated logic cell has four look-up tables for receiving four inputs respectively. In the second function that operates as one 6-input look-up table, a fifth input from a multiplexer and a sixth input from a multiplexer are added to the four inputs. In the third function that operates as a 4-to-1 multiplexer, a multiplexer receives four inputs respectively from the four look-up tables with two select lines.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.