SPRUI30H November 2015 – May 2024 DRA745 , DRA746 , DRA750 , DRA756
The eMMC/SD/SDIO1 controller can operate with two types of card voltages: 1.8 V and 3.3 V. For this reason, dual voltage pads are implemented on this interface. For technological concerns, those pads must have an internal bias voltage reference to operate. The PBIAS module supplies this bias voltage, depending on the settings of the CTRL_CORE_CONTROL_PBIAS register.
For more information about the PBIAS cell, see PBIAS Cell And MMC1 I/O Cells Control Registers, in Control Module.
Figure 25-48 shows how to configure the MMC1 controller to fit with power switching sequence.
Figure 25-48 eMMC/SD/SDIO Power Switching Procedure| Register Name | Register Name |
|---|---|
| MMCHS_STAT | MMCHS_PSTATE |
| MMCHS_CMD | MMCHS_CON |
| Subprocess Name | Cross-Reference |
|---|---|
| Send a READ_DAT_UNTIL_STOP command (CMD11). | See Section 25.5.1.2.1.7.1, Command Transfer Flow. |