Hard Processor System Technical Reference Manual: Agilex™ 5 SoCs
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5.4.6.7.1.1. Tuning Sequence for SD
The SD tuning sequence is shown in the figure below. The software sends CMD19 40 times, and the hardware adjusts data sampling point (PHY DLL settings) and gathers pass/fail statistics. Based on these statistics, the host either applies sampling point in the middle of the widest passing iterations set, or reports failure when none of iterations passed.