[SI-LIST] DDR2 ODT options

DDR2 ODT has a lot of different termination value options. 

120, 80, 60, 40 , 20 are all possible options. It is reasonable that we have 
options 80/60/40 for tuning the PCB impedance, however, I guess these many 
options have some other usage than matching various PCB traces. Anyone can 
suggest some inputs?

thanks,
Han


                
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