Data rate calibration for asynchronous serial communications

Details Data rate calibration for asynchronous serial communications Data rate calibration for asynchronous serial communications

2005-09-13

2005-09-13

Chin, Stephen (Department: 2634)

Pulse or digital communications

Synchronizers

Frequency or phase control using synchronizing signal

C375S225000

Reexamination Certificate

active

06944248

ABSTRACT:
A method and apparatus for determining the appropriate timing interval for each bit or data symbol in serial data communications. A sending device transmits a predetermined bit sequence, such as a binary pattern corresponding to one byte, either on its own initiative or in response to an action of a receiving device. A microprocessor in the receiving device measures a calibration time interval between the leading edge of a start bit and a subsequent marker transition, either between subsequent data bits or between the final data bit and the stop bit. This measured interval may be mathematically converted to units useful to calibrate a function or device that conducts input/output operations. Optionally, the process may be repeated periodically to compensate for clock rate drift. This invention may be used for autobaud data rate detection, or matching the actual data rate of a remote serial device, and permits accurate communications without precision timing references.

REFERENCES:
patent: 4208650 (1980-06-01), Horn
patent: 4761763 (1988-08-01), Hicks et al.
patent: 4761800 (1988-08-01), Lese et al.
patent: 5008902 (1991-04-01), Key et al.
patent: 5072407 (1991-12-01), Gutz et al.
patent: 5359605 (1994-10-01), Urbansky et al.
patent: 5490209 (1996-02-01), Kennedy et al.
patent: 5635911 (1997-06-01), Landers et al.
patent: 5654983 (1997-08-01), Sauser
patent: 5956648 (1999-09-01), Brennan et al.
patent: 6157689 (2000-12-01), Petty et al.
patent: 6163586 (2000-12-01), Hongbin Hao et al.
patent: 6198785 (2001-03-01), Flynn
patent: 6704350 (2004-03-01), Ryu et al.

Affiliated with

Also associated with

Rating

Data rate calibration for asynchronous serial communications does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Data rate calibration for asynchronous serial communications, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Data rate calibration for asynchronous serial communications will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3428332