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QoriQ DDR controller input AC timing

Question asked by Franck JULLIEN on Mar 15, 2013
Latest reply on Mar 18, 2013 by Franck JULLIEN

Hi,

 

In the P1020 datasheets, the only AC parameter regarding the input timings is tDISKEW (and tCISKEW which is almost the same).

This parameter gives the amount of skew consumed by the controller between MDQS and MDQ/MECC.

It says this value should be substracted from the total timing budget. However, don't we need the input setup and hold time to

determine the timing budget at the controller input ?

 

I can't find any information about the timing relationship between MCK and DQS (like tDQSS and tDQSCK on the memory side).

Is this something we don't need to know ? Am I missing something ?

 

Thanks in advance for your help.

 

Franck.

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