uhs_reg
UHS-1 Register
| Module Instance | Base Address | Register Address |
|---|---|---|
| sdmmc | 0xFF704000 | 0xFF704074 |
Offset: 0x74
Access: RW
Important: To prevent indeterminate
system behavior, reserved areas of memory must not be accessed by software or
hardware. Any area of the memory map that is not explicitly defined as a register
space or accessible memory is considered reserved.
| Bit Fields | |||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 31 | 30 | 29 | 28 | 27 | 26 | 25 | 24 | 23 | 22 | 21 | 20 | 19 | 18 | 17 | 16 |
Reserved |
ddr_reg RW 0x0 |
||||||||||||||
| 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
Reserved |
volt_reg RW 0x0 |
||||||||||||||
uhs_reg Fields
| Bit | Name | Description | Access | Reset | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
| 16 | ddr_reg | Determines the voltage fed to the buffers by an external voltage regulator.
|
RW | 0x0 | ||||||
| 0 | volt_reg | Determines the voltage fed to the buffers by an external voltage regulator. These bits function as the output of the host controller and are fed to an external voltage regulator. The voltage regulator must switch the voltage of the buffers of a particular card to either 3.3V or 1.8V, depending on the value programmed in the register.
|
RW | 0x0 |