G - Physics – 06 – F
Patent
G - Physics
06
F
G06F 11/34 (2006.01) G01R 31/3185 (2006.01) G06F 11/267 (2006.01) G06F 11/27 (2006.01)
Patent
CA 2124991
SYSTEM AND METHOD FOR PERFORMING IMPROVED PSEUDO-RANDOM TESTING OF SYSTEMS HAVING MULTIDRIVER BUSES ABSTRACT OF THE DISCLOSURE A digital system includes a number of digital subsystems interconnected by a shared bus structure that is mutually exclusively accessible for communicating data between the subsystems. The system is structured to be tested by pseudo-random scan test methodology. Each subsystem includes a counter that, during scan test periods, provides an enable signal to the bus access or driver circuitry of the associated subsystem. A scan test operation is preceded by pre-loading each counter with a predetermined state 90 that, initially, and throughout the test period, one and only one digital subsystem will drive the shared data bus. Each scan sequence (comprising a scan in, an execution cycle, and a scan out of the pseudo-random test strings) will result in the counters being clocked once so that a new subsystem will be enable to drive the bus the next sequence, permitting the bus access circuitry of each subsystem, and the bus itself, to be tested.
Gibson Walter E.
Sprouse Jeffrey A.
Smart & Biggar
Tandem Computers Incorporated
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