Stratix V Device Handbook: Volume 2: Transceivers

ID 683779
Date 11/23/2021
Document Table of Contents Manual Lock Mode

The PPM detector and phase relationship detector reaction times can be too long for some applications that require faster CDR lock time. You can manually control the CDR to reduce its lock time using two optional input ports (rx_set_locktoref and rx_set_locktodata).

Table 3.  Relationship Between Optional Input Ports and the CDR Lock Mode
rx_set_locktoref rx_set_locktodata CDR Lock Mode
0 0 Automatic
1 0 Manual-RX CDR LTR
X 1 Manual-RX CDR LTD