Maintenance registers with Boundary Scan interface
US6052808A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Oct 31, 1997 |
| Grant date | Apr 18, 2000 |
| Priority date | — |
| Expiry date | Oct 31, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R31/318569
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Concurrent Fault Detector Circuits (CFDCs) are test components of a main system, e.g. an Application Specific Integrated Circuit, and provide the results of the tests in parallel to at least one Error Source Register (ESR). Instead of reading out the ESR in parallel, its contents are copied to a serial shadow register so the contents can be read out in series to an error correcting application, thus reducing the number of output pins and the burden on resources of the main system. The ESR's receipt and transfer of information is under the control of a Boundary Scan Interface. In one embodiment, the test results are prioritized and compared to data in a mask register so that only important errors create a system interrupt which causes the read out of data from the shadow register.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.