[SI-LIST] Re: DDR2 design issues?

 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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