公开(公告)号：US09036757B1

公开(公告)日：2015-05-19

申请号：US14493652

申请日：2014-09-23

Applicant: ORACLE INTERNATIONAL CORPORATION

Inventor： Jianghui Su ,  Francis Schumacher ,  Zuxu Qin ,  Dawei Huang

IPC: H04L7/00

CPC classification number: H04L7/10 ,  H04L7/0062

Abstract: Embodiments include systems and methods for applying post-cursor locking point adjustment to an at-rate clock data recovery (CDR) system. Some embodiments operate in context of a CDR circuit of a serializer/deserializer (SERDES). In one embodiment, a training routine is used to determine an optimal post-cursor target level. Increasing or decreasing the post-cursor target level can cause the CDR clocking to shift right or left, which can be seen as a shift of the channel impulse response with respect to the CDR sampling locations. In some implementations, the post-cursor can be locked to the determined target level. In other implementations, the determined target level can be compared to a fully-adapted post-cursor to tune adaptations performed by transmitter and/or receiver equalizers.

Abstract translation: 实施例包括用于将速度锁定点调整应用于速率时钟数据恢复（CDR）系统的系统和方法。 一些实施例在串行器/解串器（SERDES）的CDR电路的上下文中操作。 在一个实施例中，使用训练例程来确定最佳的后视标目标水平。 增加或减少后视标目标水平可能导致CDR时钟向右或向左移动，这可以被看作是信道脉冲响应相对于CDR采样位置的移位。 在一些实现中，后视标可以被锁定到确定的目标级别。 在其他实施方式中，可以将确定的目标水平与完全适配的后置光标进行比较，以调谐由发射机和/或接收机均衡器执行的适配。