Zynq UltraScale+ Devices Register Reference > Module Summary > SDIO Module > reg_powercontrol (SDIO) Register
Register Name | reg_powercontrol |
---|---|
Relative Address | 0x0000000029 |
Absolute Address |
0x00FF160029 (SD0) 0x00FF170029 (SD1) |
Width | 8 |
Type | rwNormal read/write |
Reset Value | 0x00000000 |
Description | SD Bus Power and Voltage Level. |
Field Name | Bits | Type | Reset Value | Description |
---|---|---|---|---|
emmc_hwreset | 4 | rwNormal read/write | 0x0 | Hardware 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 | 3:1 | rwNormal read/write | 0x0 | By 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 | 0 | rwNormal read/write | 0x0 | Before 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 |