Method and apparatus for controlling a plurality of systems via

Details Method and apparatus for controlling a plurality of systems via Method and apparatus for controlling a plurality of systems via

1993-12-23

1996-07-09

Canney, Vincent P.

Excavating

371 251, G01R 3128

Patent

active

055352227

ABSTRACT:
A plurality of individual systems (12.sub.o -12.sub.n) are controlled during testing via a test value present on a four-wire Boundary-Scan port (17). To accomplish such control, the test value present at the Boundary-Scan port is shifted through at least one buffer (16.sub.A) which generates a control signal on its output lines (S.sub.o -S.sub.7 ) in accordance with the test value. The control signal from the buffer controls at least one multiplexer (18.sub.A) and demultiplexer (18.sub.A') that collectively operate to select one of the systems in accordance with the buffer control signal.

REFERENCES:
patent: 5198759 (1993-03-01), Ohnesorge
patent: 5400345 (1995-03-01), Ryan, Jr.
patent: 5416783 (1995-05-01), Broseghini et al.
IEEE Standard Test Access Port and Boundary-Scan Architecture, IEEE Std. 1149.1-1990, Ch. 1, pp. 1-1 thru 1-5.

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