Programmable logic expander
US4967107A · kind A · utility
35Cited by
17References
23Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | May 12, 1989 |
| Grant date | Oct 30, 1990 |
| Priority date | — |
| Expiry date | May 12, 2009 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K19/17708
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A programmable logic device that provides an AND gate array connected to an OR gate array connected to a third logic level, a logic expander module. The module provides programmable selection of any of 16 one- and two-variable logic functiosn or any of 256 one-, two- and three-variable logic functions. In one embodiment, the invention uses logic function gates such as AND, OR, XOR and inverter gates to form the logic functions. In a second embodiment and a third embodiment, a look-up table and an array of pass transistors, respectively, are used to form the logic functions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.