Test circuitry for printer memory

Details Test circuitry for printer memory Test circuitry for printer memory

1996-03-15

1996-11-26

Beausoliel, Jr., Robert W.

39518316, G06F 1100

Patent

active

055794777

ABSTRACT:
A printer has test circuitry external to its processor to test memories used inside the printer. The test is initiated by the processor by signalling the test circuitry. The test circuitry stores a first sequence in each memory then reads the sequence from the memory and compares the memory's data to the original sequence. The test is repeated with a second sequence which is the logical inverse of the first sequence. If an error occurs, a flag is set. When the test is complete, the processor is notified. The processor can check the error flag to determine whether the test was successful.

REFERENCES:
patent: 4646259 (1987-02-01), Lincoln et al.
patent: 4742483 (1988-05-01), Morrell
patent: 4757503 (1988-07-01), Hayes et al.
patent: 4846597 (1989-07-01), Bryant et al.

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