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US 2002/0172315 A1Published application
Data rate calibration for asynchronous serial communications
AssigneeBluebrook Associates LLC
InventorTerence Sean Sullivan
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AssigneeBluebrook Associates LLC
InventorTerence Sean Sullivan
Estimating the term…
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.
A method for matching an apparent data rate of an asynchronous serial data communication, comprising the steps of
A data communications apparatus for matching an apparent data rate of a remote source of asynchronous serial data communications, comprising
Dependencies are inferred from the claim text.