Scan compression circuit and method of design therefor
US7814444B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 25, 2007 |
| Grant date | Oct 12, 2010 |
| Priority date | — |
| Expiry date | Mar 2, 2029 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F30/333
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A scan-based circuit includes a selector that is implemented by multiple observation logics. Each observation logic is coupled to a scan chain to receive data to be supplied to a combinational compressor. Each observation logic is also coupled to a single input line in a corresponding group of input lines of the combinational compressor, to selectively supply data from the coupled scan chain. Each observation logic may be coupled to additional input lines (if present) in the corresponding group. The selector is operable on a per-shift basis in (a) transparent mode wherein data is supplied to all input lines and (b) several direct modes wherein data from only one scan chain is supplied at each compressor output without overlap.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.