Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – With rotor
Patent
1990-12-13
1993-10-19
Karlsen, Ernest F.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
With rotor
371 225, G01R 3128
Patent
active
052549402
ABSTRACT:
A technique of gaining direct access to the inputs and outputs of an embedded microprocessor, otherwise buried behind additional logic, is disclosed. Multiplexers are provided for at least the embedded microprocessor inputs and outputs. In a test mode, the multiplexers connect device input and output pads directly to the embedded microprocessor inputs and outputs. In a normal operating mode, the multiplexers connect the additional logic to the input and output pads. Preferably, in order to standardize design criteria, multiplexers are provided on all of the inputs and outputs of the microprocessor which may become embedded behind additional logic. Additionally, it is possible in the test mode to control the additional logic to a well defined state. The invention provides a simple way to isolate the embedded microprocessor from the rest of the logic and test it thoroughly using test vectors that have already been developed for the stand-alone microprocessor.
REFERENCES:
patent: 3961252 (1976-06-01), Eichelberger
patent: 3961254 (1976-06-01), Cavaliere et al.
patent: 4698588 (1987-10-01), Hwang et al.
patent: 4743841 (1988-05-01), Takeuchi
patent: 4931722 (1990-06-01), Stoica
patent: 4970454 (1990-11-01), Stambaugh et al.
Cummings, II Russell E.
Gavrielov Nachum M.
Oke Timothy P.
Karlsen Ernest F.
Linden Gerald E.
LSI Logic Corporation
Rostoker Michael D.
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