TPS65994AD: Power State Notification to Burnside Bridge

Hi,

PD controller should inform Burnside Bridge (Bit 24 of Connection State Register) when system entry Sx. On my DUT's PD Controller (FW based from FW509.04.11), I23M signals write "0" to Connection State Register during S3 entry. I'm expecting bit 24 to be "1".

How the PD controller know the system is in Sx entry? 

P/S: My design is EC-less.

Thanks.