公开(公告)号：US11843484B2

公开(公告)日：2023-12-12

申请号：US18046716

申请日：2022-10-14

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Suzanne Mary Vining ,  Amit S. Rane ,  Charles Michael Campbell

IPC: H04L25/03

CPC classification number: H04L25/03885 ,  H04L25/03828

Abstract: A system for selecting an equalizer setting of an equalizer to equalize signals received via a communications link. Starting with a first (e.g., minimum) equalizer setting and a threshold voltage near the mid-eye voltage of the equalized output signal, the system estimates the amplitude of the inner eye of the equalized output signal by comparing the equalized output signal to a series of threshold voltages. If the amplitude of the equalized output signal is less than ideal, the system dynamically increases the equalizer setting. The system quickly converges on the equalizer setting for the communication link because, rather than comparing the output signal at every voltage offset using every equalizer setting, the system only evaluates the equalizer settings necessary to select the equalizer setting for the communications link and uses only the voltage offsets necessary to evaluate each equalizer setting.

公开(公告)号：US11533205B2

公开(公告)日：2022-12-20

申请号：US17402118

申请日：2021-08-13

Applicant: Texas Instruments Incorporated

Inventor： Suzanne Mary Vining ,  Amit S. Rane ,  Charles Michael Campbell

IPC: H04L25/03

Abstract: A system for selecting an equalizer setting of an equalizer to equalize signals received via a communications link. Starting with a first (e.g., minimum) equalizer setting and a threshold voltage near the mid-eye voltage of the equalized output signal, the system estimates the amplitude of the inner eye of the equalized output signal by comparing the equalized output signal to a series of threshold voltages. If the amplitude of the equalized output signal is less than ideal, the system dynamically increases the equalizer setting. The system quickly converges on the equalizer setting for the communication link because, rather than comparing the output signal at every voltage offset using every equalizer setting, the system only evaluates the equalizer settings necessary to select the equalizer setting for the communications link and uses only the voltage offsets necessary to evaluate each equalizer setting.

公开(公告)号：US20150043628A1

公开(公告)日：2015-02-12

申请号：US14454420

申请日：2014-08-07

Applicant: Texas Instruments Incorporated

Inventor： Amit S. Rane

IPC: H04L25/03 ,  H04L7/00

CPC classification number: H04L25/03019 ,  H04L7/0087 ,  H04L7/10 ,  H04L25/0286 ,  H04L25/03261 ,  H04L25/03878 ,  H04L25/03885

Abstract: A SerDes corn link with a retiming receiver is operable in link training (LT) mode. A SerDes transmitter includes a TX FIR channel driver to transmit TX Data with TX pre-emphasis EQ based on TX FIR coefficients. The retiming receiver includes an RTE (retimer/reclocker) with an RT FIR driver outputting retimed RX Data based on RT FIR coefficients. A link training unit (LTU) adjusts RT FIR coefficients based on a comparison of impulse cursor information for RX Data signals received at the RTE input and re-timed RX Data signals output from the RT FIR, so that the adjusted RT FIR coefficients correspond to the TX FIR coefficients (including reflecting LT changes in TX pre-emphasis EQ). In effect, the LTU performs a linear FIR coefficient translation from the TX FIR to the RT FIR, propagating LT FIR coefficient changes from RTE input to output.

Abstract translation: 具有重定时接收器的SerDes玉米链路可在链路训练（LT）模式中操作。 SerDes发射机包括TX FIR信道驱动器，以基于TX FIR系数的TX预加重EQ发送TX数据。 重定时接收机包括具有RT FIR驱动器的RTE（重新定时器/重新锁定器），其基于RT FIR系数输出重新定时的RX数据。 链路训练单元（LTU）基于在RTE输入端接收到的RX数据信号的脉冲光标信息和从RT FIR输出的重新定时RX数据信号的比较来调整RT FIR系数，使得调整的RT FIR系数对应于 TX FIR系数（包括反映TX预加重EQ中的LT变化）。 实际上，LTU执行从FIR FIR到RT FIR的线性FIR系数转换，将LT FIR系数从RTE输入传播到输出。

公开(公告)号：US09210008B2

公开(公告)日：2015-12-08

申请号：US14454420

申请日：2014-08-07

Applicant: Texas Instruments Incorporated

Inventor： Amit S. Rane

IPC: H03H7/30 ,  H03H7/40 ,  H03K5/159 ,  H04L25/03 ,  H04L7/00 ,  H04L7/10

CPC classification number: H04L25/03019 ,  H04L7/0087 ,  H04L7/10 ,  H04L25/0286 ,  H04L25/03261 ,  H04L25/03878 ,  H04L25/03885

Abstract: A SerDes corn link with a retiming receiver is operable in link training (LT) mode. A SerDes transmitter includes a TX FIR channel driver to transmit TX Data with TX pre-emphasis EQ based on TX FIR coefficients. The retiming receiver includes an RTE (retimer/reclocker) with an RT FIR driver outputting retimed RX Data based on RT FIR coefficients. A link training unit (LTU) adjusts RT FIR coefficients based on a comparison of impulse cursor information for RX Data signals received at the RTE input and re-timed RX Data signals output from the RT FIR, so that the adjusted RT FIR coefficients correspond to the TX FIR coefficients (including reflecting LT changes in TX pre-emphasis EQ). In effect, the LTU performs a linear FIR coefficient translation from the TX FIR to the RT FIR, propagating LT FIR coefficient changes from RTE input to output.

Abstract translation: 具有重定时接收器的SerDes玉米链路可在链路训练（LT）模式中操作。 SerDes发射机包括TX FIR信道驱动器，以基于TX FIR系数的TX预加重EQ发送TX数据。 重定时接收机包括具有RT FIR驱动器的RTE（重新定时器/重新锁定器），其基于RT FIR系数输出重新定时的RX数据。 链路训练单元（LTU）基于在RTE输入端接收到的RX数据信号的脉冲光标信息和从RT FIR输出的重新定时RX数据信号的比较来调整RT FIR系数，使得调整的RT FIR系数对应于 TX FIR系数（包括反映TX预加重EQ中的LT变化）。 实际上，LTU执行从FIR FIR到RT FIR的线性FIR系数转换，将LT FIR系数从RTE输入传播到输出。