Stratix V Device Handbook: Volume 2: Transceivers

ID 683779
Date 11/23/2021
Document Table of Contents Clock Data Recovery (CDR) Control

The CDR control feature is used for Rx.L0s fast exit when operating in PIPE/PCIe Gen3 mode. After detecting an Electrical Idle Ordered Set (EIOS), it takes manual control of the CDR by forcing it into a lock-to-reference (LTR) mode. When an exit from electrical idle is detected, this feature moves the CDR into lock-to-data (LTD) mode to achieve fast data lock.