3 Replies Latest reply on Oct 31, 2014 8:40 PM by agxinmj

    Cannot assign VTT rail necessary for DDR3 Simulation

    ivan.blackford

      Hi All,

       

      I'm using BoardSim 9.1 to simulate a DDR3 interface. I have collected all my .ibs models correctly and have run a sim, however, my VTT rail is assigned as 0V, which I believe is causing the problem that my signals terminated to VTT have an incorrect offset. This results in false fails.

       

      How can I assign the VTT rail to the correct voltage? (0.75V). Setup-->Power Supplies won't let me pick a fractional voltage. Is there another way to do this? I'm using mostly resistor packs with the odd single resistor to terminate my signals.

       

      Thanks, Ivan