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. 13, 1998
Filed:
Apr. 01, 1996
Applicant:
Inventors:
Hagop Nazarian, San Jose, CA (US);
Donald A Krall, Cupertino, CA (US);
S Babar Raza, Sunnyvale, CA (US);
Assignee:
Cypress Semiconductor Corp., San Jose, CA (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H03K / ;
U.S. Cl.
CPC ...
327298 ; 327 29 ; 327296 ; 327407 ;
Abstract
The present invention provides a clocking circuit allowing individual macrocells in a particular macrocell block of a CPLD to use different polarities of the same clock. The input clock pin can now drive all the macrocells directly, which can eliminate additional buffering states and improve the clock to out timing, Tco, by (for example) 300 ps. The clocks are presented directly to the clock selection multiplexers for each macrocell. Additional functioning may be realized by implementing additional configuration bits inside the clocking architecture.