Patent ID: 7814444
Filing Date: 2010-10-12
Classification: G06F,H03M

Abstract:
1. An electronic device comprising a circuit, wherein: said circuit comprises a decompressor, a plurality of scan chains coupled to the decompressor, a selector coupled to the plurality of scan chains, and a compressor coupled to the selector; the selector comprises a plurality of observation logics; each observation logic in the plurality of observation logics comprises a single-fanout logic; at least one observation logic in the plurality of observation logics further comprises a multi-fanout logic; the selector further comprises a control logic coupled to each single-fanout logic and each multi-fanout logic; each observation logic is coupled to a scan chain among the plurality of scan chains; the compressor comprises a plurality of groups of input lines; each group of input lines comprises a first input line coupled to said single-fanout logic in an observation logic; at least one group of input lines among said plurality of groups comprises a plurality of second input lines coupled to said multi-fanout logic in said at least one observation logic; each input line in each group is selectively coupled by the each observation logic coupled thereto, to the scan chain coupled to the observation logic, in response to signals from the control logic.