F-tile Architecture and PMA and FEC Direct PHY IP User Guide

ID 683872
Date 6/26/2023
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4.5.2. Guidelines for FGT Reference Clock

For Refclk #i (i = 0 to 9) that are being used by the FGT PMA only:
  • When the parameter Refclk #i is active at and after device configuration is set to On, the refclk #i must be active at and after device configuration time.
  • When the parameter Refclk #i is active at and after device configuration is set to Off, the refclk #i can be inactive at any time. You must drive en_refclk_fgt_i to 2'b00 when refclk #i is inactive, and drive en_refclk_fgt_i to 2'b01 when refclk #i is active.