I'm using AD-FMCADC2-EBZ Eval board wich carries an AD9625 ADC which transfers data to an FPGA using JESD204B link.
After power up I get synchronisation K characters until I generate a SysRef pulse which triggers SYNC to go High after some periods.
Just after that ADC send ILAs frames (4 frames) and everything looks good. Then I get user data wich looks OK.
BUT, JESD IP core into my FPGA detects unexpected K-Character which induces SYNC to go low for one clock period (most of the time).
And times to time, SYNC is going low for a longer period of time which causes ADC to restarts Synchronization process.
By disabling SCRAMBLING into ADC I checked that unexpected K-character are received (For instance K31.7=0xFF or K30.3=0x7D).
Why this errors occurs ? Could it comes from faulty ADC ? Is it a known issue ?
Or does something else can cause this type of errors (wrong ADC configuration)
Thanks in advance for your help.