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. 09, 1994
Filed:
Aug. 13, 1993
Gregg R Josephson, Aloha, OR (US);
Ju Shen, San Jose, CA (US);
Roy D Darling, Forest Grove, OR (US);
Chan-Chi J Cheng, San Jose, CA (US);
Lattice Semiconductor Corporation, Hillsboro, OR (US);
Abstract
A structure and method for in-system programming of a programmable logic device are provided. The in-system programming structure provides one dedicated pin for in-system programming function, additional in-system programming pins are multiplexed with programmable input/output pins used in functional operations. When an enable signal is received at the dedicated pin, the multiplexed pins relinquish their roles as programmable input/output pin to become in-system programming pins. A state machine controls the programming steps. The in-system programming structure can be cascaded in a 'daisy chain' fashion.