Microprocessor and method of testing the same

Details Microprocessor and method of testing the same Microprocessor and method of testing the same

1997-12-05

1999-08-17

Barlow, John

Data processing: measuring, calibrating, or testing

Testing system

Of circuit

371 225, 371 226, 39518306, 39518312, G05B 1900

Patent

active

059407832

ABSTRACT:
A microprocessor includes an assign function for assigning ports to a mode identifying unit, test signal input unit, and test result signal output unit, a test implement function for sending test results to the test result signal output unit according to the test data signals input from the test signal input unit, and an activation control function for activating the test implement function upon identifying a test mode by the status of the mode identifying unit. When a test mode signal from test equipment is received at the test mode identifying unit assigned to one port of the microprocessor, the test signal input unit and the test result signal output unit are assigned to other ports of the microprocessor, and when the test data signals from the test equipment are received at the test data signal input unit, test result signals according the test data signals are output from the test result signal output unit.

REFERENCES:
patent: 4975641 (1990-12-01), Tanaka et al.
patent: 5101498 (1992-03-01), Ehlig et al.
patent: 5557558 (1996-09-01), Daito
patent: 5657330 (1997-08-01), Matsumoto
patent: 5742617 (1998-04-01), Warren

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