http://referencedesigner.com/books/si/time-and-distance.php
this can explain to you your issues On 6/30/2016 6:28 AM, Gerald Coley wrote: > You use the PCB SW tools to give you the lengths of each trace. The > distance from one layer to the next is not that significant and is > well within the needed tolerance. > > Gerald > > > On Sat, Jun 25, 2016 at 6:16 PM, <[email protected] > <mailto:[email protected]>> wrote: > > Hello, > > I am designing my own board based on the am3358 and one ddr3 > chip. I looked at the bbb project to have a example of layout and > i have a question about length matching for the ddr3 interface. > How the length matching has been done if different layers are > used? The signal on the outer layers doesnt travel at the same > speed as the inner layers. > > -- > For more options, visit http://beagleboard.org/discuss > --- > You received this message because you are subscribed to the Google > Groups "BeagleBoard" group. > To unsubscribe from this group and stop receiving emails from it, > send an email to [email protected] > <mailto:beagleboard%[email protected]>. > To view this discussion on the web visit > > https://groups.google.com/d/msgid/beagleboard/0f800b4e-6e8d-4e20-962d-7efb1d709ec2%40googlegroups.com. > For more options, visit https://groups.google.com/d/optout. > > > > > -- > Gerald > > [email protected] <mailto:[email protected]> > http://beagleboard.org/ > [email protected] <mailto:[email protected]> > > -- > For more options, visit http://beagleboard.org/discuss > --- > You received this message because you are subscribed to the Google > Groups "BeagleBoard" group. > To unsubscribe from this group and stop receiving emails from it, send > an email to [email protected] > <mailto:[email protected]>. > To view this discussion on the web visit > https://groups.google.com/d/msgid/beagleboard/CAHK_S%2Be0PNUqUP1v48RB0NYGMapggiESACpxC5-jg9uKH34HcA%40mail.gmail.com > <https://groups.google.com/d/msgid/beagleboard/CAHK_S%2Be0PNUqUP1v48RB0NYGMapggiESACpxC5-jg9uKH34HcA%40mail.gmail.com?utm_medium=email&utm_source=footer>. > For more options, visit https://groups.google.com/d/optout. -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/beagleboard/84582216-992a-946f-2547-d0a093e0e3fe%40gmail.com. For more options, visit https://groups.google.com/d/optout.
