[SI-LIST] why 75/150 ohms in ODT?
- From: Canes Venatici <starsilic@xxxxxxxxx>
- To: si-list@xxxxxxxxxxxxx
- Date: Tue, 18 Sep 2007 05:15:12 -0700 (PDT)
Hi all,
I am trying to simulate the DDR2 interface, which is connected to component
type of memories (no DIMM).
The question I have is, will there be a usage for ODT options 75/150 ohms. If
the typical PCB transmission lines are 50ohms, is there a need for bringing
75/150 ohms in the options for ODT normally found in drivers. I thought this
75/150 is applicable only if DIMM is the type of the end-memory. Am I right?
Could anyone clarify on this.
thanks
Canes
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