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DDRx Batch JEDEC results understanding

Question asked by human_being on Jun 21, 2016

Hello everyone!

 

While conducting DDRx batch simulation I have encountered some problems with JEDEC results interpretation. For DQ signals I obtained a "Fail" mark in Monotonic column and some Vref Treshold Multicross. I understand that the Monotonic is "“Fail” if the waveform at the receiver reverses direction while between VILac and VIHac.". I inspect waveform in ocsillocscope and did not find any big reverses in it. Should I consider it seriously? I attach DQ0 write to DRAM with the problem encircled.

 

Thank you

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