Method and control device for launch-off-shift at-speed scan testing
US9709629B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 8, 2013 |
| Grant date | Jul 18, 2017 |
| Priority date | — |
| Expiry date | Jan 8, 2033 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R31/318575
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The invention provides a method for launch-off-shift at-speed scan testing for at least two scan chains of an integrated circuit comprises iteratively shifting set values for functional elements of a first one of the scan chains clocked with a shift clock, iteratively shifting set values for functional elements of a second one of the scan chains clocked with the shift clock, launching an at-speed scan test clocked with a functional clock for the first one of the scan chains at a last shift cycle of the first one of the scan chains, delaying the last shift cycle for the second one of the scan chains for a predetermined time span, launching an at-speed scan test clocked with a functional clock for the second one of the scan chains at the last shift cycle of the second one of the scan chains, capturing the sample values of the functional elements of the first and second scan chains after the last shift cycle of the scan chains.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.