Rambus Inc.

Glenn Chiu

Wayne S Richardson

Jun Y Kim

A method for calibrating a communication channel coupling first and second components includes transmitting a data signal from the first component to the second component on the communication channel, and sensing a characteristic, such as phase, of the data signal on the second component. Information about the sensed characteristic is fed back to the first component using an auxiliary channel. An adjustable parameter, such as phase, for the transmitter is adjusted on the first component in response to the information. Also, a characteristic of a data signal received from the transmitter on the second component is sensed and used to adjust an adjustable parameter for the receiver on the first component.

Communication channel calibration using feedback

A system is provided with clock skew measurement and correction technology. A first circuit or memory controllerincludes measuring circuits to measure relative timing or phase offsets of multiple clock signals of a second circuit or memory. One measuring circuit is configured for incremental changing of the phase of a transmitted test data sequence to measure and correct timing of a memory receiver circuit's quadrature clocks based on results of a data comparison of transmitted and received test data. Another measuring circuit is configured to scan a received test data sequence for data transitions to measure and correct timing of a memory transmitter circuit's quadrature clocks based on spacing or timing between detected transitions. Individual memory clock generatorsare controlled with adjustable delay circuitsfor changing phase of different clock signals of the memory to set the clock signals based on the measurements of the controller.

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San Bruno, CA, United States of America

Glenn Chiu