US 8,427,457 B2 · Display driver and built-in-phase-calibration circuit thereof

Abstract

A phase-calibration circuit including a pattern generator, a phase adjuster, a rotate register unit, a detector unit, and an optimization unit is disclosed. The pattern generator generates a clock pattern and a data pattern for a target circuit. The phase adjuster adjusts a phase between a first clock and a first data output from the target circuit according to a control data for outputting a second clock and a second data. The rotate register unit provides the control data to the phase adjuster. The detector unit detects phase relationship between the second clock and the second data for outputting a detection result. The optimization unit records the control data output from the rotate register unit in accordance with the detection result, and selects one of the control data as a calibration control data, and controls the rotate register unit to output the calibration control data to the phase adjuster.

Claims20

Dependent claims

A phase-calibration circuit for calibrating a target circuit, comprising:

a pattern generator, for generating a clock pattern and a data pattern for the target circuit;
a phase adjuster, for receiving a first clock and a first data output from the target circuit, and adjusting a phase relationship between the first clock and the first data according to a control data, so as to output a second clock and a second data;
a rotate register unit, for providing the control data to the phase adjuster and changing the control data according to a predetermined timing;
a detector unit, coupled to the phase adjuster, for detecting a phase relationship between the second clock and the second data to output a detection result;
and
an optimization unit, coupled to the detector unit and the rotate register unit, for recording the control data output from the rotate register unit according the detection result to select one of the control data as a calibration control data, and controlling the rotate register unit to output the calibration control data to the phase adjuster.

3 more elements

A display driver, comprising:

a receiver, for receiving an external signal;
and
a phase-calibrating circuit, built in the display driver, for calibrating the receiver, the phase-calibrating circuit comprising:
a pattern generator, for generating a clock pattern and a data pattern for the receiver;
a phase adjuster, for receiving a first clock and a first data output from the receiver, and adjusting a phase relationship between the first clock and the first data according to a control data, so as to output a second clock and a second data;
a rotate register unit, for providing the control data to the phase adjuster and changing the control data according to a predetermined timing;
a detector unit, coupled to the phase adjuster, for detecting a phase relationship between the second clock and the second data to output a detection result;
and
an optimization unit, coupled to the detector unit and the rotate register unit, for recording the control data output from the rotate register unit according the detection result to select one of the control data as a calibration control data, and controlling the rotate register unit to output the calibration control data to the phase adjuster.

6 more elements

Dependencies are inferred from the claim text.

Display driver and built-in-phase-calibration circuit thereof

Life of this patent

Display driver and built-in-phase-calibration circuit thereof

Life of this patent

Abstract

Claims20