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[SOLVED] DDR2/DDR3 query - Please explain

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sree205

sree205

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DDR2/DDR3 query

Hi,
DDR2 and DDR3 use double data rate, as in, they send data in both posedge and negedge of dqs. Now, when DDR2-800 is mentioned, the frequency or cycle time is specified as 400Mhz. I think this means only DQS frequency and the internal frequency of the clock is only 100 Mhz. Am i correct about this?

Thanks.
 

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