Advanced Micro Devices Corporation

Ati Technologies Ulc

Gurunath Dollin

Gerald Robert Talbot

Milam Paraschou

Michael J Tresidder

Hanwoo Cho

Jeffrey Cooper

Damon Tohidi

Thomas H Likens, Iii

Varun Gupta

Chad S Gallun

Eric Ian Carpenter

Scott F Dow

Edoardo Prete

Ryan J Hensley

Edward Wade Thoenes

Systems, apparatuses, and methods for implementing a periodic receiver clock data recovery scheme with dynamic data edge paths are disclosed. An IQ link calibration scheme performs a non-destructive data and edge path switch to determine an IQ offset without disturbing the data. A data path and an edge path pass through multiple stages of deserializers to widen the data path, with the deserializers clocked by clock divided versions of the original data and edge clocks. To initiate a calibration routine, the edge clock is aligned with the data clock, and then data and edge paths are swapped at a common point in a slower clock domain. The data path is then calibrated while the edge path carries the data signal. After the data path is calibrated, the edge and data paths are swapped back to the original configuration.

Periodic receiver clock data recovery with dynamic data edge

Systems, apparatuses, and methods for implementing a deskewing method for a physical layer interface on a multi-chip module are disclosed. A circuit connected to a plurality of communication lanes trains each lane to synchronize a local clock of the lane with a corresponding global clock at a beginning of a timing window. Next, the circuit symbol rotates each lane by a single step responsive to determining that all of the plurality of lanes have an incorrect symbol alignment. Responsive to determining that some but not all of the plurality of lanes have a correct symbol alignment, the circuit symbol rotates lanes which have an incorrect symbol alignment by a single step. When the end of the timing window has been reached, the circuit symbol rotates lanes which have a correct symbol alignment and adjusts a phase of a corresponding global clock to compensate for missed symbol rotations.

Deskewing method for a physical layer interface on a multi-chip module

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San Jose, CA, United States of America

Gurunath Dollin