International Business Machines Corporation

Xiao Di Xing

Xu Guang Sun

Yang Xiao

Zhen Peng Zuo

A example receiver includes analog circuitry configured to equalize and amplify an input signal and provide an analog signal as output; clock data recovery (CDR) circuitry configured to recover data clocks and edge clocks from the analog signal; a plurality of eye height optimization circuits, each of the plurality of eye height optimization circuits configured to, based on a respective data pattern of a plurality of data patterns, sample the analog signal based on the data clocks and the edge clocks, feed back first information to the analog circuitry for adjusting the eye amplitude, and feed back second information to the CDR circuitry for adjusting the data clocks; and an eye width optimization circuit configured to receive data and edge samples from the plurality of eye height optimization circuits, feed back third information to the CDR circuitry to adjust the edge clocks, and feed back fourth information to the analog circuitry to adjust the equalization.

Real-time eye diagram optimization in a high speed IO receiver

Embodiments of the present disclosure relate to a computer-implemented method. According to the method, a series of valid control codes for a calibration stage in a channel corresponding to a plurality of calibration cycles are acquired from the calibration logic. The acquired valid control codes are analyzed to obtain changing characteristics for the calibration stage in the channel. The calibration logic for the calibration stage in the channel is adjusted in one or more subsequent calibration cycles based on the changing characteristics.

Calibration on high-speed IO interfaces

Techniques and systems for performing calibration. A method includes: creating a common calibration pool for performing a calibration operation for two or more communication links, wherein the calibration operation is common to the two or more communication links; and performing a calibration on each of the two or more communication links using the common calibration pool by receiving a calibration request associated with the common calibration operation via a link calibration interface, wherein the calibration request is from at least one of the two or more communication links, upon determining the calibration agent is available to handle the calibration request, retrieving a calibration engine from at least one of the plurality of calibration clusters corresponding to the calibration operation, retrieving a calibration engine from at least one of the plurality of calibration clusters corresponding to the calibration operation, and performing the common calibration based on the retrieving.

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Beijing, China

Xiao Di Xing