Test facilitating circuit of microprocessor

Details Test facilitating circuit of microprocessor Test facilitating circuit of microprocessor

1997-12-10

1999-12-14

Palys, Joseph E.

Error detection/correction and fault detection/recovery

Data processing system error or fault handling

Reliability and availability

714 47, 714 48, 714718, G06F 1100

Patent

active

060031425

ABSTRACT:
A test facilitating circuit of a microprocessor has a mode register (11). If data stored in the mode register indicates a test mode, the test facilitating circuit uses a test mode function of a cache memory (1), to execute a test program written in the cache memory irrespective of the resetting of the microprocessor. The test program carries out a built-in test on internal circuits of the microprocessor. Results of the test are stored in the cache memory. After the test, an external tester reads the test results out of the cache memory and examines them.

REFERENCES:
patent: 4967387 (1990-10-01), Shibasaki et al.
patent: 5250895 (1993-10-01), Hariai
patent: 5497459 (1996-03-01), Tanihira et al.
patent: 5530804 (1996-06-01), Edgington et al.
patent: 5673275 (1997-09-01), Garcia et al.
patent: 5712822 (1998-01-01), Petrosino et al.
patent: 5825738 (1996-11-01), Momohara

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