edge and center aligned data

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hulk789

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What is the difference between edge aligned and center aligned data.
 

hulk789 said:
What is the difference between edge aligned and center aligned data.
Click to expand...

The difference is a 90 degree phase shift between clock and data for DDR and 180 degree phase shift for SDR.
i.e. clock edge alligned with data chnges or in the middle between data changes when the data is stble
 

ads-ee said:
The difference is a 90 degree phase shift between clock and data for DDR and 180 degree phase shift for SDR.
i.e. clock edge alligned with data chnges or in the middle between data changes when the data is stble
Click to expand...

What is SDR and DDR here
 

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