>> Do I need to really carefully examine PCB trace lengths and timing, or
>> can I assume no issues?
>
> Personally, I'd certainly keep trace lengths and impedance issues in
> mind.
>
> DDR is a parallel bus. Any time you see the word "parallel bus" length
> matching should be something to be concerned about.

Sure, but I'm wondering if things have to be matched within 0.1" or 1", or ?
The memory speed is 180MHz, I forgot to mention that earlier.
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