[SI-LIST] Re: DDR1 without VTT termination
- From: Scott McMorrow <scott@xxxxxxxxxxxxx>
- To: Kathiresan K <k.kathir@xxxxxxxxx>
- Date: Mon, 31 Mar 2008 10:44:16 -0400
Kathir
Unfortunately, there are no easy ways out. It is impossible to know
what will work without simulation or previous experience with that
particular processor and the memory device. The size of the processor
package can make or break the design.
Scott
Scott McMorrow
Teraspeed Consulting Group LLC
121 North River Drive
Narragansett, RI 02882
(401) 284-1827 Business
(401) 284-1840 Fax
http://www.teraspeed.com
Teraspeed® is the registered service mark of
Teraspeed Consulting Group LLC
Kathiresan K wrote:
> Hi,
> I need to have a single chip DDR1 (160 MHz, 16-Bit) memory for a processor.
> I don't want to provide VTT terminations. I'll keep the trace length as
> minimum as possible. I may provide series termination but I haven't done
> pre-layout simulation yet.
> Can somebody please clarify whether it can be designed without VTT
> termination? If yes, what can be the maximum trace length I go for? If I'm
> providing series termination, should I provide at both the ends for
> bi-directional signals?
>
> Regards,
> Kathir
>
>
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