Platform forum

"closest groups" vs. "outside groups" in routing DDR3?

miner_tom , 11-13-2016, 02:13 PM
I was reading your paper on "How to route DDR3 and fan out" and I saw the designations "outside groups" and "closest groups". I am not sure that I know what you mean by those expressions.

BTW, I am having a great time with your routing course.

Thank You
robertferanec , 11-14-2016, 09:53 AM
Wow! Good catch!

Did you read the article at Altium page, this one: How to Route DDR3 Memory and CPU fan-out
Because it looks like they re-done the pictures wrong Here is what I have on my website: Do you plan ahead when working on CPU DDR3 fanout?

miner_tom , 11-14-2016, 12:55 PM
Thank You, I did read the article but it did not clear up the definition of "outside group" and "closest group". Outside of what? Closest to what?

robertferanec , 11-14-2016, 01:28 PM
Closest to the ADDR/CTRL/CMD signals, out of the ADDR/CTRL/CMD signals.
gyuunyuu1989 , 10-27-2023, 08:00 PM
This link is broken:
Page not found. You have landed in the wrong place. You will not find FEDEVEL educational courses on this page.

Could you elaborate a bit more on what this "outside group" and "closest group" means and why this is required? I read the article on the Altium website and I am confused since the term "closest group" is not defined anywhere. I am also confused as to why we are trying to use TH-Via since such via will have a stub and that can be very bad for high speed signals.
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