Cypress FM4 Series - Preset Value Registers

CHAPTER 15: SD Card Interface
880 FM4 Peripheral Manual, Doc. No. 002-04856 Rev. *E
2.31 Preset Value Registers
The Preset Value Registers consist of the following registers for different speed modes as shown below.
Offset
Preset Value Register
Signal Voltage
0x060
Preset Value for Initialization
3.3 V or 1.8 V
0x062
Preset Value for Default Speed
3.3 V
0x064
Preset Value for High Speed
3.3 V
0x066
Preset Value for SDR12
1.8 V
0x068
Preset Value for SDR25
1.8 V
0x6A
Preset Value for SDR50
1.8 V
0x06C
Preset Value for SDR104
1.8 V
0x06E
Preset Value for DDR50
1.8 V
Each of the 8 Preset Value Registers has the following bit configuration.
D15 D14
D13 D11
D10
D09 D00
Driver Strength Select
Value
Rsvd
Clock Generator Select
Value
SDCLK Frequency Select Value
For details of this register, refer to SD Specifications Part A2.