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TPS65994AD: Tiger Lake BB Re-timer Compliance Mode

Part Number: TPS65994AD

We are developing a Tiger Lake notebook with Thunderbolt . In order to pass the Thunderbolt compliance test, Burnside Bridge Re-timer is necessary to be set by PD to a special mode called compliance mode. Could you advice what is the exact command sent from EC to TPS64994AD for executing the function mentioned? Thanks.