System and method for performing logic failure diagnosis using multiple input signature register output streams
US7487420B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Feb 15, 2006 |
| Grant date | Feb 3, 2009 |
| Priority date | — |
| Expiry date | Jun 15, 2026 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R31/318547
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A logic failure diagnosis system for performing logic failure diagnosis and methods for manufacturing and using same. The logic failure diagnosis system includes a signature register system and a space compaction system and, during testing, receives data values from a predetermined number of scan chains. During each scan cycle, the signature register system combines a set of data values with a set of recirculated data values to provide a set of data signature values. The signature register system recirculates the data signature values from the preceding scan cycle to provide the recirculated data values. The space compaction system compresses the data signature values to provide a compressed scan chain signature for the scan chains. The compressed scan chain signature can be compared with a set of expected values to determine whether the scan chains include any erroneous values and, if so, to identify a source of the erroneous values.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.