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DDR3 Trace Length

Question asked by Joseph Alejandro on Nov 19, 2015
Latest reply on Nov 19, 2015 by igorpadykov

Hello,

 

I am designing a board with the i.MX6Q and (4) 2GBIT 800MHZ FBGA modules on board.  I have read the Hardware Development Guide from Freescale regarding keeping the trace lengths as equal in length as possible.  My question though is as follows:  The guide requests that I keep my clock traces to a max length of 2.25 inches and every other trace group smaller than that.  In my design, I can't keep my Address lines smaller than 4.5 inches in length for the group.  Where can I compromise the recommendations?  Do I make my clock lines at least 4.5 inches in length, or leave the clock lines as is and the address lines would just be longer than the clock?

 

Thanks in advance,

Joseph

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