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AR# 62616

7 Series GTX/GTH Transceivers: RXCDR_CFG setting for 8B10B unscrambled data at line rates > 6.6 Gbps

Description

( UG476) The 7 Series FPGA GTX/GTH Transceivers User Guide v1.11 provides RXCDR_CFG settings for GTX/GTH for different configurations.

The GTX and GTH tables (4-19 and 4-21) provide the settings for line rates of <= 6.6 Gbps only.

However, there are some protocols that require 8B10B encoding/decoding at line rates > 6.6 Gbps such as JESD204B or CPRI.

Solution

For applications that require > 6.6 Gbps with 8B10B data, with no pre-scrambling and no SSC, the same settings as scrambled/PRBS data can be used (tables 4-17 and 4-20). 
AR# 62616
Date Created 10/27/2014
Last Updated 04/28/2015
Status Active
Type General Article
Devices
  • Virtex-7
  • Kintex-7