The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 16, 1994
Filed:
Mar. 26, 1992
Keiichi Kawana, Tokyo, JP;
Kawasaki Steel Corporation, Kobe, JP;
Abstract
A semiconductor integrated circuit capable of electrically writing functions according to this invention comprises a plurality of logical blocks capable of electrically writing functions and wire elements capable of programmably connecting the logical blocks to each other. Each of the logical blocks includes a gate element as an output buffer having a control terminal. The gate element assumes a high impedance state when inputting a control signal to the control terminal. An output of the logical block is thereby made unable; or the respective logical blocks are directly wired-connectable to effect logical sum outputting. Alternatively, the gate element assumes two output states of an open drain output and a totem-pole output. Hence, in the semiconductor integrated circuit of this invention, it is possible to improve a gate using efficiency of the small-sized programmable logical blocks and attain a high-density and high-integrated programmable logic device.