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:
Jun. 17, 2008
Filed:
Feb. 28, 2005
Thomas Arthur Almy, Tualatin, OR (US);
Arnold M. Frisch, Portland, OR (US);
Thomas Arthur Almy, Tualatin, OR (US);
Arnold M. Frisch, Portland, OR (US);
Credence Systems Corporation, Milpitas, CA (US);
Abstract
A triggering circuit asserts a trigger signal in response to edges of a digital signal conveying a repetitive pattern of edges. The triggering circuit generates first data having a value identifying a position within the pattern of a last occurring edge of the digital signal and generates second data having a value identifying a position of a particular edge within the pattern that is to initiate a next assertion of the trigger signal. The triggering circuit asserts the trigger signal when the first and second data values match and de-asserts the trigger signal when the first and second data do not match. In a repetitive mode of operation, the triggering circuit keeps the second data value constant so that it always asserts the trigger signal in response to the same edge of the pattern. In a sequential mode of operation, the triggering circuit changes the value of the second data each time it asserts the trigger signal so that successive assertions of the trigger signal occur in response to differing edges of the digital signal pattern.