Isolation enable test coverage for multiple power domains
US11119153B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | May 29, 2020 |
| Grant date | Sep 14, 2021 |
| Priority date | — |
| Expiry date | May 29, 2040 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R31/318575
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method of testing a multiple power domain device includes sending a control signal from a test controller powered by a switchable power domain to a non-scan test data register powered by an always on power domain. The method further includes setting, using the control signal, a test data register value of the register to enable scan mode by bypassing an isolation cell between an output of the switchable domain and an input of the always on domain and, while the register value continuously enables scan mode: shifting a test pattern into a scan chain including a flip-flop coupled to the isolation cell, capturing a test result from the scan chain, and shifting the test pattern out of the scan chain to observe the test result. The isolation cell is configured to allow or disallow propagation of a signal from the output to the input.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.