Diagnostic circuit

Details Diagnostic circuit Diagnostic circuit

1984-06-20

1987-10-20

Fleming, Michael R.

Excavating

371 25, 371 69, G06F 1100, G01R 3128

Patent

active

047019174

ABSTRACT:
A diagnostic circuit is used to test the operation of a complex digital system by transferring operands to and from a plurality of registers (12, 14, 16). In a typical application the registers (12, 14, 16) in operation utilize parallel data transfers. For diagnostic purposes the registers (12, 14, 16) are connected serially and, in response to selected shift commands, data can be shifted either right or left through the registers (12, 14, 16). First and second buses (18, 20) provide serial, bidirectional paths for data transfer between the group of registers (12, 14, 16) and a service processing unit (26). In response to commands generated by the service processing unit (26) the registers (12, 14, 16) can be loaded right or left and read right or left. Whenever data is being read from the registers (12, 14, 16) the output data is recirculated back into the registers such that a complete cycle results in the original state being restored in the registers (12, 14, 16).

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Frechette, T. J. & Tanner, F., Electronics, "Support Processor Analyzes Errors Caught by Latches", Nov. 8, 1979, pp. 116-118.

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