TN-41-02: DDR3 ZQ Calibration - Micron Technology
https://www.micron.com/-/media/client/global/Documents/Products/Technical%20Note/DRAM/TN4102.pdf
TN-41-02: DDR3 ZQ Calibration ZQ Calibration Commands line to the reference voltage set at V DDQ/2. This process generates the VOL codes and updates the pull-down devices at the appropriate time, completing the calibration process. ZQ Calibration Commands Two new commands relating to ZQ calibration are introduced in DDR3. The ZQ CALI-
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