But in DDR4 there is no voltage divider circuit at the receiver. It instead has an internal voltage reference which it uses to decide if the signal on data lines (DQ) is 0 or 1. This voltage reference is called VrefDQ. The VrefDQ can be set using mode registers MR6 and it needs to be set correctly by the memory controller during the VrefDQ calibration phase.
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This story was originally featured on Fortune.com