Zynq UltraScale+ Devices Register Reference > Module Summary > SDIO Module > reg_powercontrol (SDIO) Register

reg_powercontrol (SDIO) Register

reg_powercontrol (SDIO) Register Description

Register Namereg_powercontrol
Relative Address0x0000000029
Absolute Address 0x00FF160029 (SD0)
0x00FF170029 (SD1)
Width 8
TyperwNormal read/write
Reset Value0x00000000
DescriptionSD Bus Power and Voltage Level.

reg_powercontrol (SDIO) Register Bit-Field Summary

Field NameBitsTypeReset ValueDescription
emmc_hwreset 4rwNormal read/write0x0Hardware reset signal is generated for eMMC card when this bit is set 1 - Drives the hardware reset pin as ZERO (Active LOW to eMMC card) 0 - Deassert the hardware reset pin.
pwrctrl_sdbusvoltage 3:1rwNormal read/write0x0By setting these bits, the HD selects the voltage level for the SD card. Before setting this register, the HD shall check the voltage support bits in the capabilities register. If an unsupported voltage is selected, the Host System shall not supply SD bus voltage.
000- 100 Reserved
101 1.8V(Typ.)
110 3.0V(Typ.)
111 3.3V(Flattop.)
pwrctrl_sdbuspower 0rwNormal read/write0x0Before setting this bit, the SD host driver shall set SD Bus Voltage Select. If the HC detects the No Card State, this bit shall be cleared.
0 Power Off
1 Power On