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. 18, 2013
Filed:
Jun. 25, 2010
Vivek Chickermane, Ithaca, NY (US);
Brion Keller, Binghamton, NY (US);
Karishna Chakravadhanula, Vestal, NY (US);
Vivek Chickermane, Ithaca, NY (US);
Brion Keller, Binghamton, NY (US);
Karishna Chakravadhanula, Vestal, NY (US);
Cadence Design Systems, Inc., San Jose, CA (US);
Abstract
A method and system for reducing switching activity of a spreader network during a scan-load operation is disclosed. According to one embodiment, a spreader network receives a plurality of scan input signals from a tester. A linear feedback shift register of the spread network is updated using the plurality of scan input signals. Each bit of the linear feedback shift register is shifted at each shift cycle for a plurality of shift cycles. The linear feedback shift register outputs a nonlinear gating signal using a first set of outputs and a data value feeding one or more scan chains of the spreader network using a second set of outputs. The pipeline clock of a pipeline element of the scan chains is gated using the nonlinear gating signal, and the data value is fed to the scan chains based on the pipeline clock. The scan chains are fed with updated values at the pipeline stage.