4.3.4. AFI Calibration Status Timing Diagram
At power-up, the PHY holds afi_cal_success and afi_cal_fail 0 until calibration is done, when it asserts afi_cal_success, indicating to controller that the PHY is ready to use and afi_wlat and afi_rlat signals have valid values.
At recalibration, the controller asserts afi_cal_req, which triggers the same sequence as at power-up, and forces recalibration of the PHY.
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