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:
Feb. 04, 1997
Filed:
Jun. 06, 1995
Applicant:
Inventors:
Thomas A Kean, Edinburgh, GB;
William A Wilkie, Edinburgh, GB;
Assignee:
Xilinx, Inc., San Jose, CA (US);
Attorneys:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G11C / ;
U.S. Cl.
CPC ...
36518908 ; 326 38 ; 377 28 ;
Abstract
In an FPGA having registers which are part of a user's logic functions and a configuration memory which is read and written through an addressing structure, a register protect circuit controllably protects the contects of these user logic registers from being modified by signals from the user's logic, allows these registers to be written by a microprocessor through the configuration memory addressing structure, and allows both the user's registers and lines which provide combinational signals to be read by a microprocessor through the configuration memory addressing structure.