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:
Oct. 07, 1997
Filed:
Oct. 26, 1995
Khue Duong, San Jose, CA (US);
Stephen M Trimberger, San Jose, CA (US);
Bernard J New, Los Gatos, CA (US);
Xilinx, Inc., San Jose, CA (US);
Abstract
A fast carry-out scheme in a field programmable logic array. The configurable logic blocks (CLBs) are arranged in columns. The carry-out signals are routed from the bottom CLB of a column to the top CLB of that column. The carry-out from the top-most CLB is then multiplexed onto a clock line that is normally used to conduct clocking signals to the CLBs. Instead of conducting clocking signals, the existing clock line is now used to route the carry-out signal onto a vertical longline spanning the entire height of the column. Eventually, the carry-out signal is routed from the longline to its destination CLB of the adjacent column via local interconnect resources.