Testing synchronous bus system - feeding parallel cyclically phase-shifted pseudo-random data stream to inputs of bus system, reversing data stream at output of bus system, and comparing data stream with original quasi-random sequence

摘要

The data of a quasi-random data stream is processed into n parallel identical data streams. The n parallel data streams are cyclically shifted in time relative to each other and are fed to the n inputs of the bus system (2) to be tested. The data streams at the outputs of the bus system (2) are further serialised (3). The previously-carried-out cyclic time shift is then carried out in reverse. By comparing (5) the original quasi-random stream with the serialised data stream taken from the bus output data streams, an error or fault can be determined. The data and time information of a quasi-random stream are fed to a first n stage shift register (1). The data at the outputs of the bus system (2) may then be fed to the parallel inputs of a second shift register (3).