Continuous, automatic reset of synchronous data receiver upon de

Details Continuous, automatic reset of synchronous data receiver upon de Continuous, automatic reset of synchronous data receiver upon de

1984-05-03

1986-09-23

Bookbinder, Marc E.

Pulse or digital communications

Spread spectrum

Direct sequence

375112, H04L 710

Patent

active

046139796

ABSTRACT:
Recovery from loss of synchronization of a synchronous serial receiver is assured by automatic reset circuitry described herein. In a synchronous serial data receiver, synchronization, data and fill characters are received from a synchronous signal transmitter. The synchronization character is provided at the beginning of each data record to establish receiver synchronization before control data is received. The fill character is used to maintain synchronization during data reception when no useful data is available for transmission. Detection of either of these characters indicates receiver synchronization with the received data. Failure to detect either of these characters during a predetermined time interval is sensed as an error indicating that the receiver has lost synchronization with the received data. The reset signal sequence is provided to the synchronous serial data receiver to reinitialize receiver operation to an initial set of conditions in order to re-synchronize the receiver with the received serial data. The reset signal sequence also resets automatic reset signal generating circuitry to permit detection of the next synchronization or fill character. The reset signal sequence is provided as long as is necessary to accomplish receiver resynchronization.

REFERENCES:
patent: 4316284 (1982-02-01), Howson
AMI American Microsystems, Inc. spec sheet "Universal Synchronous Receiver/Transmitter" S2350 pp. 5.119-5.126.

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