PM375_D00_Allegro_layout PCB stack up question - L3 DQS (W/S 5/8 mil) Impedance

Your PCB stack up points out DQS trace in L3 (Ref L2/L5 ; W/S 5/8 mil)impedance is 80 ohm.
Becase our PCB stack up is copy yours, but PCB vendor points out DQS trace in L3
Ref L2/L5 ; W/S 5/8 mil) impedance is 94 ohm.
Could you check it again or pase your Impendacne form to formus?


Hi Owenc,

These impedance are auto-calculated by Allegro, you can find the related reference parameters in ‘Constraint Manager’ of board file.