公开(公告)号：US20180294802A1

公开(公告)日：2018-10-11

申请号：US15480283

申请日：2017-04-05

Applicant: Xilinx, Inc.

Inventor： Richard W. Swanson ,  Terence J. Magee ,  Qi Zhang ,  Srinivas Vura

IPC: H03K5/06 ,  G11C11/4076 ,  H04L7/00

Abstract: An example method of calibrating a source-synchronous system includes: performing initial calibration of a source-synchronous receiver, which is configured to receive data signals and a strobe, to determine an initial strobe delay and initial data delays; setting a strobe delay circuit that delays the strobe to have the initial strobe delay and data delay circuits that delay the data signals to have the initial data delays; measuring first data eye margins of the data signals at a first time; calculating metrics for the data signals based on the first data eye margins; and measuring second data eye margins of the data signals at a second time; and updating the data delay circuits and the strobe delay circuit based on the second data eye margins and the metrics.

公开(公告)号：US10103718B1

公开(公告)日：2018-10-16

申请号：US15480283

申请日：2017-04-05

Applicant: Xilinx, Inc.

Inventor： Richard W. Swanson ,  Terence J. Magee ,  Qi Zhang ,  Srinivas Vura

IPC: G11C11/407 ,  G11C7/22 ,  H03K5/134 ,  G11C7/00 ,  G11C7/10 ,  H03K5/06 ,  G11C11/4076 ,  H04L7/00 ,  H03K5/00

Abstract: An example method of calibrating a source-synchronous system includes: performing initial calibration of a source-synchronous receiver, which is configured to receive data signals and a strobe, to determine an initial strobe delay and initial data delays; setting a strobe delay circuit that delays the strobe to have the initial strobe delay and data delay circuits that delay the data signals to have the initial data delays; measuring first data eye margins of the data signals at a first time; calculating metrics for the data signals based on the first data eye margins; and measuring second data eye margins of the data signals at a second time; and updating the data delay circuits and the strobe delay circuit based on the second data eye margins and the metrics.