Test facilitating circuit of microprocessor
US6003142A · kind A · utility
44Cited by
7References
17Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Dec 10, 1997 |
| Grant date | Dec 14, 1999 |
| Priority date | — |
| Expiry date | Dec 10, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F11/2236
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A test facilitating circuit of a microprocessor has a mode register (11). If data stored in the mode register indicates a test mode, the test facilitating circuit uses a test mode function of a cache memory (1), to execute a test program written in the cache memory irrespective of the resetting of the microprocessor. The test program carries out a built-in test on internal circuits of the microprocessor. Results of the test are stored in the cache memory. After the test, an external tester reads the test results out of the cache memory and examines them.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.