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

ID 683872
Date 11/04/2024
Public
Document Table of Contents

4.5.2. Guidelines for FGT Reference Clock

Fo Refclk #i (i = 0 to 9) that you ae usig fo the FGT PMA:
  • Whe the paamete Refclk #i is active at ad afte device cofiguatio is set to O, the Refclk #i must be active at ad afte device cofiguatio time, o else,
    • If you eable Refclk #i moito, out_efclk_fgt_i does ot have a valid output.
    • If you disable Refclk #i moito, the FGT PMA lae pefomace degades.
  • Whe the paamete Refclk #i is active at ad afte device cofiguatio is set to Off, the efclk #i ca be iactive at ay time.
    • Afte the Refclk #i becomes active, you must pefom a 1'b0 -> 1'b1 tasitio o iput e_efclk_fgt_i, othewise out_efclk_fgt_i does ot have a valid output.
    • Afte the Refclk #i becomes iactive:
      • If the disable_efclk_moito_i sigal is dive to 1'b1, the you must pefom a 1'b1 -> 1'b0 tasitio o iput e_efclk_fgt_i, othewise the FGT PMA lae pefomace degades.
      • If the disable_efclk_moito_i sigal is dive to 1'b0 o is discoected, the you do ot have to take ay actio.