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about AFE5808 deserialize test

Other Parts Discussed in Thread: AFE5808

hi~
  i have a qustion for AFE5808 about  "deserialize"
  we  used  Xilinx FPGA EVM -ML605 (vritex6)  and  AFE5808 EVM  to test deserialize
 
  when  i used TI's EVM GUI  to set  command  " Custom patten" for  test patten
            => deserialize  result  is   correct
 
  but   when i set  command " Ramp" for  test patten
  => deserialize  result  have noise  , like bitslip ...

  so i don't understand  if my FPGA deserialize module is right
  why  "Custom patten "  is  correct
  but "Ramp patten " is error ?