SD_BUS_PWR_VDD1=Val_0x0, SD_BUS_PWR_VDD2=Val_0x0, SD_BUS_VOL_VDD2=Val_0x0
Power Control Register
| SD_BUS_PWR_VDD1 | SD Bus Power for VDD1. It can be used to control the VDD1 power supply of the card. Before setting this bit, the SD Host Driver sets the SD Bus Voltage Select bit. If the Host Controller detects a No Card state, this bit is cleared. In SD mode, if this bit is cleared, the Host Controller stops the SD clock by clearing the SDMMC_CLK_CTRL_R[SD_CLK_IN] bit. 0 (Val_0x0): Power off 1 (Val_0x1): Power on |
| SD_BUS_VOL_VDD1 | SD Bus Voltage Select for VDD1/eMMC Bus Voltage Select for VDD. These bits enable the Host Driver to select the voltage level for an SD or eMMC card. Before setting these bits, the Host Driver checks the Voltage Support bits in the Capabilities register (SDMMC_CAPABILITIES1_R and SDMMC_CAPABILITIES2_R). If an unsupported voltage is selected, the Host System does not supply the SD Bus voltage. The value set in this field is available on the SDMMC output signal, which is used by the voltage switching circuitry. SD Bus Voltage Select options: 0x0 - 0x4: Reserved 0x5: 1.8 V (Typical) for Embedded 0x6: 3.0 V (Typical) 0x7: 3.3 V (Typical) eMMC Bus Voltage Select options: 0x0 - 0x4: Reserved 0x5: 1.2 V (Typical) 0x6: 1.8 V (Typical) 0x7: 3.3 V (Typical) |
| SD_BUS_PWR_VDD2 | SD Bus Power for VDD2. This is irrelevant for SD and eMMC card. 0 (Val_0x0): Power off 1 (Val_0x1): Power on |
| SD_BUS_VOL_VDD2 | SD Bus Voltage Select for VDD2. This is irrelevant for SD and eMMC card. 0 (Val_0x0): VDD2 Not Supported 5 (Val_0x5): 1.8 V 6 (Val_0x6): Not used 7 (Val_0x7): Not used |