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. 13, 2005
Filed:
Mar. 10, 2005
Naren K. Sahoo, Carrollton, TX (US);
Naren K. Sahoo, Carrollton, TX (US);
STMicroelectronics, Inc., Carrollton, TX (US);
Abstract
A self test for a counter system in an integrated circuit includes a clock coupled to counters in a plurality of counters. A first counter in the plurality of counters has a first counter output and a first counter rollover. A second counter in the plurality of counters has a second counter output, a second counter rollover less than the first counter rollover, and a second counter rollover signal that is active when the second counter has rolled over. A comparison circuit having inputs coupled to the first and second counter outputs, compares the first and second counter outputs to produce a counter error output signal. A latch latches the counter error output signal in response to the second counter rollover signal being inactive and the counter error output signal indicating a difference in the first and second counter outputs. Counters may be segmented to reduce a number of digits.