Diagnostic circuit for digital systems
US4476560A · kind A · utility
21Cited by
6References
18Claims
0Family size
Assignees
Inventors
Key dates
| Filing date | Sep 21, 1982 |
| Grant date | Oct 9, 1984 |
| Priority date | — |
| Expiry date | Sep 21, 2002 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R31/318555
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An improved circuit for serial scan diagnosis is provided. A state register in the signal path of the digital system under diagnosis is coupled to a diagnostic shift register. Test data is introduced and removed through the diagnostic shift register through a serial input terminal and serial output terminal. For certain operations the serial input terminal becomes a control terminal whereby a minimum number of control lines is required.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.