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DDR3 ZQ calibration, memory controller

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weva_84

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hi, i'm learning ddr3 spec and would like to design a ddr3 memory controller.
could anyone provide me some help about my question?
1. is the ZQ calibration function must supported in memory controller?
ZQ calibration is used to calibration Ron and Rtt, is there any condition that the Ron&Rtt not need to calibration sucn as DDR2?
2. is the predefined pattern for MPR can be modified by controller ? or the predefined pattern is fixed with the device ?
3. why ddr3 have two reference voltage? one for DQ and the other for CTRL ?

4. could anyone provide some materials ？thanks a lot

thanks
best regards!
weva
 

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