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:
Dec. 21, 2004
Filed:
Feb. 15, 2000
Applicant:
Inventor:
William Lloyd McNeil, Apex, NC (US);
Assignee:
International Business Machines Corporation, Armonk, NY (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G06F 1/04 ;
U.S. Cl.
CPC ...
G06F 1/04 ;
Abstract
An on-chip clock generation system used the Serial Interface in an on-chip JTAG facility to write bit patterns in a shift register. The bit patterns are applied to control inputs of a clock generation circuit whose clock outputs are varied in accordance with changes to the bit patterns. By using the same facility to provide JTAG and clock functions the output clocks provided by clock generation circuit on the chip can be varied without using additional pins or the output clocks themselves.