Re: Gnd plane coupling with DDR routing from FPGA <-> DDR?
- From: "David Spencer" <davidmspencer@xxxxxxxxxxx>
- Date: Thu, 29 Nov 2007 16:41:30 GMT
"Didi" <diditgi@xxxxxxxxx> wrote in message
news:0fb44a5a-ceba-4643-87ad-4ea2f1ed60f2@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
It's not the frequency that matters, but rather the edge rate. It is the
Again, 120 MHz is nearly DC nowadays. You don't need any
fancy SI tools to do it.
Dimiter
behavior of the edges that are altered by the characteristics of a
transmission line. The frequency just indicates how often such edges occur.
This is why many older designs fail when a manufacturer introduces a faster,
die-shrunk, version of a part. Although the application is using the part in
the same way, the unavoidable change in edge rate can break a previously
working board.
.
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