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i.MX28 DDR length matching discrepancy between AN4215 and EVK

Question asked by Matt Young on Apr 30, 2019
Latest reply on May 1, 2019 by gusarambula

I have a i.MX28 design in layout right now, and the layout engineer imported the EVK layout to start with the DDR routing. On the EVK, the WE, RAS, CAS, CE0, and ODT signals are mismatched by up to 670 mils. AN4215 states these signals should be matched to within 200 mils. Should we modify the known good layout to match AN4215, or is it overly conservative?

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