18.3.2.3.1 Direct Calibration

In this mode, the user sets the value for ODT (DDR3PHY_ZQ0CR1.ZPROG[7:4]) and of output impedance (DDR3PHY_ZQ0CR1.ZPROG[3:0]) independently. The calibration sequence is run by writing DDR3PHY_PIR (ZCAL and INIT fields must be set to '1'). Each time DDR3PHY_ZQ0CR1.ZPROG is modified, a new calibration must be triggered.

Note: Calibration of the pull-down/pull-up is done regardless of the programmed value.

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