Appeal No. 96-0166
Application 08/083,419
This is a decision on appeal under 35 U.S.C. § 134 from
the examiner's final rejection of claims 1-20. The amendment
received March 27, 1995, (Paper No. 12) has been entered.
We reverse.
BACKGROUND
The disclosed invention is directed to a system and
method for performing pseudo-random scan testing of systems
that have individual subsystems interconnected by a shared
bus.
Claim 1 is reproduced below.
1. Apparatus for permitting scan testing of a
digital system of a type having at least two digital
units coupled to a bus means that is shared by the two
digital units for communication of information
therebetween on a mutually exclusive basis during a
normal mode of operation, each one of the two digital
units including bus enable means coupling each of the two
digital units to the bus means, the scan testing being
conducted during a test mode of operation by a scan
control means coupled to the digital system for placing
the digital system in a pseudo-random state, the
apparatus comprising:
circuit means associated with each of the two
digital units, and coupled to the scan control means, for
receiving a predetermined test pattern;
means coupled to the scan control means and
responsive to a test signal from the scan control means
to couple the circuit means to the bus enable means to
ensure that only one of the bus enable means is coupled
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