Stratix V Device Handbook: Volume 2: Transceivers

ID 683779
Date 11/23/2021
Document Table of Contents GT Channel Receiver Clocking

The CDR in the PMA of the GT receiver channel recovers the serial clock from the incoming data and is driven by an input reference clock or clock from the reference clock network in the same GT transceiver bank.

The CDR also divides the serial clock (recovered) to generate the parallel clock (recovered). Both clocks are used by the deserializer. The parallel clock (recovered) is forwarded to the FPGA fabric to interface the FPGA fabric with the transceiver. All PCS functions, such as word alignment, rate matching, decoding, and byte ordering, must be implemented in the FPGA core because the PCS is unavailable in the GT receiver channel.

Figure 69. GT Channel Receiver Clocking