FreeLists / si-list / [SI-LIST] Re: DDR2 IMPEDANCE

["tao xu" <helen.tao.xu@xxxxxxxxx>]

kenny, what kind of impedance did you ask? Buffer output impedance for
interface or normal trace impedance on board?

On 12/1/06, Jory McKinley <jory_mckinley@xxxxxxxxx> wrote:
> Hello Kenny,
> Are you designing this type interface?  If so then take a look at the AMCC 
> spec:
> https://www.amcc.com/MyAMCC/retrieveDocument/PowerPC/440EP/PPC440EP_DS2002_v1_24.pdf
>
> There should be some board guideline information for the DDR interface.  You 
> will have to simulate.
>
> Simulating an existing interface?  If you can obtain a board file then the 
> traces (impedances) can be extracted for the interface.
>
> -Jory
>
>
>  Kenny Frohlich <kenny_frohlich@xxxxxxxxx> wrote: Hi All,
> Can someone please tell me where I can find information on DDR2 impedances 
> (ie. what is the impedance of CLK? Data? Address? Command?)?
> We use PowerPC PPC440EP and on-board DDR2 SDRAMs.
>  Thank you.
>
>  Regards,
> Kenny
>
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