In normal mode, the CDR (Clock and Data Recovery) is locked to incoming data. In some cases (i.e., when the receiver is used as a simple oversampler, or when NIDRU is needed), the CDR must be locked to local oscillator.
To lock the CDR to the local reference clock, read-modify-write through the DRP interface and set RX_CDR_CTRL2_LANE[7] = '1'. The recovered clock will now be locked to thelocal reference clock. References: Dynamically Programmable DRU for High-Speed Serial I/O Application Note (XAPP875):
This overrides the Phase Interpolator code.
http://www.xilinx.com/support/documentation/application_notes/xapp875.pdf
| AR# 40810 | |
|---|---|
| Date | 02/08/2013 |
| Status | Active |
| Type | General Article |
| Devices | |