LSI system with a plurality of LSIs having different scan system

Excavating

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364579, 364580, 371 225, G05B 2302

Patent

active

054652596

ABSTRACT:
An LSI system in which a plurality of LSIs having different scan systems are provided on an identical printed circuit board. The LSI system includes a common scan data-in terminal commonly provided for the plurality of LSIs on the printed circuit board, and a common scan data-out terminal commonly provided for the plurality of LSIs on the printed circuit board. The plurality of LSIs are classified into a plurality of groups, each group including at least one LSI having an identical scan system. Each LSI has a scan data-in pin and a scan data-out pin. Each group is connected in series or in parallel with each other, by way of the scan data-in pin and the scan data-out pin of the corresponding LSI, between the common scan data-in terminal and the common scan data-out terminal. By the above constitution, it is possible to decrease the number of external terminals to be provided on the printed circuit board for the scan operation. Also, it is possible to systematically take procedures for effecting the scan operation and thereby reduce time for the scan operation.

REFERENCES:
patent: 4931722 (1990-06-01), Stoica
patent: 5029166 (1991-07-01), Jarwala et al.
patent: 5054024 (1991-10-01), Whetsel
patent: 5056093 (1991-10-01), Whetsel
patent: 5068603 (1991-11-01), Mahoney
patent: 5254942 (1993-10-01), D'Souza et al.
patent: 5312277 (1994-06-01), Sparks et al.

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