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DDR3 Clock Trace Length

Question asked by Shoumin Liu on Apr 12, 2016
Latest reply on Apr 19, 2016 by jiri-b36968

The Hardware Development Guide for Vybrid, Rev. 1, 05/2015 says in Table 20 on page 36 that the reference length for the DDR_CLK differential pair is 3 inches. Do they have to be this long? The Guide recommended that the traces be as short as possible in other places. Can we route the DDR_CLK differential pair 1 inch or 800 mils?


Also, what strategy does Table 22 on page 39 show, same-length or by-byte group? Thank you.