Method of checking connections between each of a plurality of ci

Details Method of checking connections between each of a plurality of ci Method of checking connections between each of a plurality of ci

1996-10-30

1999-08-17

Chung, Phung M.

Excavating

371 221, H04B 1700

Patent

active

059404140

ABSTRACT:
A logic circuit has a first circuit block, a second circuit block, and a test circuit composed of a first multiplexer and a second multiplexer. In normal operation mode, the first multiplexer connects the output terminal of the first circuit block to the input terminal of the second circuit block on the basis of the first test signal, and the second multiplexer disconnects the input terminal of the second circuit block from the external output terminal on the basis of the second test signal; in a first test mode for outputting a signal outputted by the first circuit block through the external output terminal, the first multiplexer connects the output terminal of the first circuit block to the input terminal of the second circuit block on the basis of the first test signal, and the second multiplexer connects the input terminal of the second circuit block to the external output terminal on the basis of the second test signal; and in a second test mode for inputting a signal inputted to the second circuit block through the external input terminal, the first multiplexer connects the external input terminal to the input terminal of the second circuit block on the basis of the first test signal, and the second multiplexer disconnects the input terminal of the second circuit block from the external output terminal on the basis of the second test signal. Therefore, the test circuit can inspect whether there exists any erroneous connection relationship in the normal operation mode of the logic circuit, after the test circuit has been connected.

REFERENCES:
patent: 5491699 (1996-02-01), Scheuermann et al.
patent: 5557573 (1996-09-01), McClure
patent: 5729553 (1998-03-01), Motohara

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