Boundary test cell with self masking capability

Details Boundary test cell with self masking capability Boundary test cell with self masking capability

1992-04-30

1996-06-18

Beausoliel, Jr., Robert W.

Excavating

371 226, 324 7611, 3241581, G01R 3128

Patent

active

055286100

ABSTRACT:
Boundary scan cells including mask circuitry having a mask latch for storing a mask flag that is serially scanned into the cell via a scan flip-flop. In a boundary scan cell having an output function, control circuitry responsive to the mask flag forces or holds the output of the cell at a state determined by one or more values scanned into the cell via the scan flip-flop if the mask flag is of a predetermined state that indicates the cell is masked. In a boundary scan cell having an input function, control circuitry responsive to the mask flag connects the output of the scan flip-flop to the input of the scan flip-flop if the mask flag is of a predetermined state that indicates the cell is masked.

REFERENCES:
patent: 4441075 (1984-04-01), McMahon
patent: 5008886 (1991-04-01), Chinnaswamy et al.
patent: 5084874 (1992-01-01), Whetsel, Jr.
patent: 5206584 (1993-04-01), Nishimori
patent: 5220281 (1993-06-01), Matsuki
patent: 5230000 (1993-07-01), Mozingo et al.
patent: 5252917 (1993-10-01), Kadowaki
patent: 5252971 (1993-10-01), Franz et al.
patent: 5260948 (1993-11-01), Simpson et al.
patent: 5319646 (1994-07-01), Simpson et al.

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