[SI-LIST] Re: DDR2 design issues?

Hello Icer,

 From the way you have phrased your question, referring to terminations 
as "pull-ups," I suspect that your background is digital design and not 
SI.  The design of something as complex as a DDR2 interface is not 
something that could be readily communicated in an email response, even 
to someone already skilled in the practice of SI.  I would suggest 
subcontracting out the design.  There are a number of folks on this list 
who may be in a position to take on additional work at this time, if 
that is a direction you wish to pursue.

Best regards,
     -Bill


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    / Advanced Electronic Concepts, LLC /
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icer world wrote:
> hello everyone:
>     I will use DDR2 in my design ,and the DDR2 controller surpport ODT 
> function  .I think if I take use of ODT function ,pull-up resistor connected 
>  to VTT (0.5VDD) will not be needed in all the signal pins.But I got a demo 
> design from chip applier that use 50ohm pull-up resistor connected 
>  to VTT in all the signal pins.Can anyone tell me whether pull-up resistor 
> connected  to VTT is needed in my design?If needed,please tell me how to 
> design it ,thanks!
> 
>       
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