公开(公告)号：US20150067209A1

公开(公告)日：2015-03-05

申请号：US14013634

申请日：2013-08-29

Applicant: Advanced Micro Devices, Inc.

Inventor： Xin Liu ,  Hai Nguyen

IPC: G06F13/42 ,  H03K5/22

CPC classification number: H03K5/22 ,  H03K5/156 ,  H03K5/2481

Abstract: A system and method for efficient detection of Low Frequency Periodic Signaling (LFPS) input signals. A receiver receives two input differential signals that are LFPS input signals. The receiver increases the common-mode voltage for each of the two input differential signals and determines two polarity opposite differences between the level shifted intermediate differential signals. The differences are used to generate two series of relatively narrow pulses by comparisons with a given threshold. A wide continuous pulse is asserted when an initial pulse among the two series of pulses is detected. The wide continuous pulse is deasserted when a final pulse among the two series of pulses is detected. While the wide continuous pulse is asserted, control logic is awakend and performs a Universal Serial Bus (USB) protocol for processing data on the input differential signals.

Abstract translation: 一种有效检测低频周期信号（LFPS）输入信号的系统和方法。 接收器接收两个输入差分信号，这些信号是LFPS输入信号。 接收器增加两个输入差分信号中的每一个的共模电压，并确定电平移位中间差分信号之间的两极性相反的差异。 差异用于通过与给定阈值进行比较来产生两系列相对较窄的脉冲。 当检测到两个脉冲序列之间的初始脉冲时，会产生一个较宽的连续脉冲。 当检测到两个脉冲串中的最后一个脉冲时，宽连续脉冲被断言。 当宽连续脉冲被断言时，控制逻辑唤醒并执行用于处理输入差分信号数据的通用串行总线（USB）协议。

公开(公告)号：US09490791B2

公开(公告)日：2016-11-08

申请号：US14013634

申请日：2013-08-29

Applicant: Advanced Micro Devices, Inc.

Inventor： Xin Liu ,  Hai Nguyen

IPC: G06F13/42 ,  H03K5/22 ,  H03K5/156 ,  H03K5/24

CPC classification number: H03K5/22 ,  H03K5/156 ,  H03K5/2481

Abstract: A system and method for efficient detection of Low Frequency Periodic Signaling (LFPS) input signals. A receiver receives two input differential signals that are LFPS input signals. The receiver increases the common-mode voltage for each of the two input differential signals and determines two polarity opposite differences between the level shifted intermediate differential signals. The differences are used to generate two series of relatively narrow pulses by comparisons with a given threshold. A wide continuous pulse is asserted when an initial pulse among the two series of pulses is detected. The wide continuous pulse is deasserted when a final pulse among the two series of pulses is detected. While the wide continuous pulse is asserted, control logic is awakened and performs a Universal Serial Bus (USB) protocol for processing data on the input differential signals.

Abstract translation: 一种有效检测低频周期信号（LFPS）输入信号的系统和方法。 接收器接收两个输入差分信号，这些信号是LFPS输入信号。 接收器增加两个输入差分信号中的每一个的共模电压，并确定电平移位中间差分信号之间的两极性相反的差异。 差异用于通过与给定阈值进行比较来产生两系列相对较窄的脉冲。 当检测到两个脉冲序列之间的初始脉冲时，会产生一个较宽的连续脉冲。 当检测到两个脉冲串中的最后一个脉冲时，宽连续脉冲被断言。 当宽连续脉冲被断言时，控制逻辑被唤醒并执行用于处理输入差分信号数据的通用串行总线（USB）协议。