Intel® 400 Series Chipset On-Package Platform Controller Hub
Online Register Database
Power Control Register (powercontrol) – Offset 29
This register is used to program the Bus power and voltage level
Bit Range | Default | Access | Field Name and Description |
---|---|---|---|
6:5 | - | - | Reserved
|
4 | 0h | RW | eMMC HW Reset (emmc_hwreset) Hardware reset signal is generated for eMMC card whenthis bit is set |
3:1 | 0h | RW | SD Bus Voltage Select (pwrctrl_sdbusvoltage) By setting these bits, the HC selects the voltage level for the SD card. Before setting this register, the HC shall check the voltage support bits in the capabilities register. If unsupported voltage is selected, the Host System shall not supply SD bus voltage |
0 | 0h | RW | Bus Power (pwrctrl_sdbuspower) Before setting this bit, the SD host driver shall set SDBus Voltage Select. If the HC detects the No Card State,this bit shall be cleared. |