[SI-LIST] DDR2 on-die termination 75ohm and 50ohm

Hi,

I'd like to know the difference between DDR2 utilizing odt75 and
odt50. According to Micron's datasheet, odt50 is configured after 
667MHz. So alternatively, two odt schemes can be used. 

I've tried to simulate odt50 and odt75, but the waveforms of the two 
odt schemes are pretty identical. What's the advantage in odt50 over 
odt75?


Best Regards,
Danny
2005/05/27


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