Two-Dimensional Scan Architecture
AssigneeMentor Graphics Corporation
InventorsYu Huang, Wu-Tung Cheng, Ruifeng Guo, Manish Sharma, Liyang Lai
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Abstract
Aspects of the invention relate to techniques of using two-dimensional scan architecture for testing and diagnosis. A two-dimensional scan cell network may be constructed by coupling input for each scan cell to outputs for two or more other scan cells and/or primary inputs through a multiplexer. To test and diagnose the two-dimensional scan cell network, the two-dimensional scan cell network may be loaded with chain patterns and unloaded with corresponding chain test data along two or more sets of scan paths. Based on the chain test data, one or more defective scan cells or defective scan cell candidates may be determined.
Claims13
A method of scan chain diagnosis, comprising:
- loading a two-dimensional scan cell network with chain patterns along a first set of scan paths;
- unloading the two-dimensional scan cell network along the first set of scan paths to collect first chain test data;
- loading the two-dimensional scan cell network with chain patterns along a second set of scan paths;
- and
- unloading the two-dimensional scan cell network along the second set of scan paths to collect second chain test data.
A circuit design comprising a two-dimensional scan cell network, the two-dimensional scan cell network comprising primary input scan cells and core scan cells, input for each of the core scan cells being coupled to outputs for two or more other scan cells in the two-dimensional scan cell network through a multiplexer, input for each of the primary input scan cells being coupled to at least one primary input.
Dependencies are inferred from the claim text.