Communication control circuit

Details Communication control circuit Communication control circuit

2005-07-05

2005-07-05

Phunkulh, Bob (Department: 2661)

Multiplex communications

Diagnostic testing

Loopback

C370S251000

Reexamination Certificate

active

06914884

ABSTRACT:
The invention provides a communication control device that includes a self-diagnostic test circuit capable of executing an operation test. The communication control circuit includes a PHY circuit on an LSI with little trouble, and at a operating speed that is equivalent to actual operation. The self-diagnostic test circuit includes: test data creation circuit for creating test data; expected value data creation circuit for creating expected values of the test data after processing; an arbitration signal switching circuit that switches arbitration signals such that test data supplied from the output driver can be received by a receiver of the same twisted-pair drive block as the output driver; and a comparison circuit that compares test data supplied from an output driver and received by a receiver of the same twisted-pair drive block as the output driver with the expected value data and creates match flags.

REFERENCES:
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patent: 6560200 (2003-05-01), Shinozuka
patent: 6578095 (2003-06-01), Tanaka et al.
patent: 9-214502 (1997-08-01), None
patent: 10-170606 (1998-06-01), None
patent: 11-4240 (1999-01-01), None
Motohiko Inad “An Introduction to IEEE Standard 1394”, Second Edition, Chapter 2, Gijyutsu-Hyoron Co. Ltd.

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