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AFE58JD18EVM: LVDS 16x serial data rate data recovery

Part Number: AFE58JD18EVM

Tool/software:

I'm interfacing the AFE with a Xilinx eval board.  I'm using the AFE58JD18EVM with LVDS 1X clk rate with the 16X serial data rate.  I'm using the data in Lsb first mode and I successfully recover the frame clock X"FF00" and have used a number of different test patterns out of the AFE but they don't always show up in the same place.  For a particular pattern they do but depending on the pattern it does not.  There is no timing diagram for the 16x serial data rate but I would assume that in Lsb first mode I'd receive bit o would arrive with the first '1' of the recovered frame clk and bit 15 would arrive with the last '0' of the frame clk.  

  • Hi,

    Your understanding is correct . Can you please share when are you getting correct data and when are you getting incorrect data ? Also can you please share the incorrect data and expected data in this case .

  • Thanks for confirming the above information.  It helped make one more unknown thing.. known.  I did end up figuring out after fixing multiple transcription errors(bit order out of SERDES and endianness into 10G).  Note to others troubleshooting. USE of all test patterns.  One confusing thing was the ramp pattern when using the demod is very different(I'm not using it) than the ramp pattern when not using demod.  Somehow I got stuck looking for the pattern out of demod in the datasheet.

  • Demod ramp pattern includes channel ID also as MSB bits . This is the difference between normal ramp and demod ramp.