Programmable gate array with logic cells having configurable out

Details Programmable gate array with logic cells having configurable out Programmable gate array with logic cells having configurable out

1990-04-02

1993-02-09

Trans, Vincent N.

Boots, shoes, and leggings

364488, 34082583, 307465, H01L 2710

Patent

active

051857065

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.

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"The Programmable Gate Array Design Handbook"; 1st Ed.; published by Xilinx; pp. 1--1 to 1-31.
"XC3000 Logic Cell Array Family"; Published by Xilinx; p. 1-31 (FIG. 15b).

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