Circuit for sensing a communication state

Details Circuit for sensing a communication state Circuit for sensing a communication state

1996-08-26

1998-08-04

Hudspeth, David R.

Electronic digital logic circuitry

Signal sensitivity or transmission integrity

326 93, 370 851, H03K 1716

Patent

active

057899363

ABSTRACT:
A circuit for sensing a communication state equipped with a signal detecting circuit and a busy signal generating circuit for sensing different communication states accurately monitors the communication state of a communication network. The circuit includes a signal detecting section for detecting a start signal representing the initiation of data transmission and a stop signal informing of the finish of the data transmission from serial data and serial clock received via a bus, a busy signal generating section for determining a level of a busy signal according to levels of the start signal and stop signal of the signal detecting section, and a microprocessor for controlling the transmission/reception of the serial data and serial clock in accordance with the level of the busy signal of the busy signal generating section. Thus, when data is transmitted to other auxiliary device except the auxiliary devices under being communicated, the destroy of the communicating data is prevented.

REFERENCES:
patent: 5199107 (1993-03-01), Ozawa
patent: 5287458 (1994-02-01), Michael et al.
patent: 5559502 (1996-09-01), Schutte
patent: 5577260 (1996-11-01), Sakuma

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