Programmable gate array with logic cells having configurable output enable
US5185706A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 2, 1990 |
| Grant date | Feb 9, 1993 |
| Priority date | — |
| Expiry date | Apr 2, 2010 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K19/17736
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A configurable logic array, includes a plurality of configurable logic cells which include a tristate output buffer, having an input receiving a logic signal from within the configurable logic cell, an output connected to the configurable interconnect structure and an output enable input. A plurality of selectors, controlled by the configuration memory, supply output enable signals for controlling corresponding tristate output buffers. The inputs to the plurality of selectors include a "common output enable signal," and at least a second logic signal, such as a constant high or constant low logic level. A circuit responsive to program data in the configuration memory and input signals from the interconnect structure generates the common output enable signal. One input of the selector is provided by an invertor connected from the input of the tristate output buffer to the selector for connecting an output signal to a long line in a wired-AND configuration.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.