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Cannot assign VTT rail necessary for DDR3 Simulation

Question asked by ivan.blackford on Oct 27, 2014
Latest reply on Oct 31, 2014 by agxinmj

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

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