kicad-developers team mailing list archive

[Pierre Parent <pierre.parent@xxxxxxxxxxxxx>]

Hi,

Well, someone reported to me that he could ran a board only in slower DDR 
timing because he did not do any  length matching.

Also olimex has done length matching in their board olinuxino maxi (enclosed 
image), and we can find plenty of design guidelines about DDR(2,3) routing 
speaking of length matching. Eagle and Altium include length matching tool. So 
I'm not an expert but it is probably not just a joke when it comes to Ram 
(don't know about USB).

Pierre.



Le mercredi 16 avril 2014, 22:01:06 Lorenzo Marcantonio a écrit :
> On Wed, Apr 16, 2014 at 08:33:45PM +0200, Pierre Parent wrote:
> > I've sent to production my first length matched board, here is a picture!
> > I
> > hope it will work!
> 
> I did a board which contained an USB high speed hub (and an USB camera,
> too). Didn't measure the impedance or looked at the eye pattern (no
> equipment :P) but it worked. Luckily both TVS and common mode chokes
> where designed to work with it, so no big meandering to do...
> 
> So it should work your too.

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