The controller's I/O clocking modes are listed in the following table.
| Controller Mode | Clock Rate (MHz) | Data Rate | Clock Source | Tuning Method | |
|---|---|---|---|---|---|
| SD | Default speed | 25 | Single | DIV_CLK | ~ |
| SDR-12 | 25 | Single | DIV_CLK | ~ | |
| High speed | 50 | Single | DLL Clocks | Manual | |
| SDR-25 | 50 | Single | DLL Clocks | Manual | |
| DDR-50 | 50 | Double | DLL Clocks | Manual | |
| SDR-50 | 100 | Single | DLL Clocks | Auto-tuning | |
| SDR-104 | 200 | Single | DLL Clocks | Auto-tuning | |
| eMMC | Legacy MMC | 25 | Single | DIV_CLK | ~ |
| HS-SDR | 50 | Single | DLL Clocks | Manual | |
| HS-DDR | 50 | Double | DLL Clocks | Manual | |
| HS-200 | 200 | Single | DLL Clocks | Auto-tuning | |