[SI-LIST] Re: DDR2 design issues?

sreekanthn, ODT is disabled by default.  The answers to the questions 
you have been asking are available in the DDR2 spec available from 
JEDEC.  You really should obtain a copy.  I also think you would be well 
served to follow Bill Wurst's advice about seeking some experienced help.

Steve

sreekanthn wrote:
>  Hi,
>
>     In my Understanding, OnDieTermination(ODT) is the option given in DDR2
> in which 50/75/150 Ohms can be configured. We can disable the ODT and use
> external termination, if our simulation demands value other than the above
> specified.
>
> Best Regards,
> Sreekanth N Nampoothiri
>
> -----Original Message-----
> From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On
> Behalf Of icer world
> Sent: Tuesday, March 25, 2008 5:31 PM
> To: SI LIST
> Subject: [SI-LIST] DDR2 design issues?
>
> 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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