Neoway N75 - Figure 3-21 SD Connection; Table 3-3 SD Card Feature Parameters

N75
Hardware User Guide
Copyright © Neoway Technology Co., Ltd
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SD is a dual-voltage SD3.0 interface, which supports a read rate up to 104 MB/s and ordinary SD card.
Table 3-3 SD card feature parameters
Mode
IO Level (V)
Max Clock Frequency (MHz)
Timing Mode
SDR
1.8/2.85
200
DS, HS, SDR12, SDR25, SDR50, SDR104
DDR
50
DDR50
Figure 3-21 shows SD connection.
Figure 3-21 SD connection
SDC_CLK
SDC_CMD
SDC_DATA0
SDC_DATA1
N75 module
SD
connector
SDC_DATA2
SDC_DATA3
SDC_DET
SDC_PWR_EN VCC
CLK
CMD
DATA0
DATA1
DATA2
DATA3
DET
VDD_SDC_IO
VDD_1P8
10k
Ω
47kΩ
SDC
Power
10k
Ω
10k
Ω
10k
Ω
10k
Ω
R1 R2 R3 R4 R5
R7
C1 C2
1uF
0.1uF
ESD1 ESD2
4 5
1 2
3
4 5
1 2
3
20Ω
R6
Schematic Guidelines
⚫
Note that the logic level of SD interface does not match 3.3V.
⚫
VDD_SDC_IO is the power supply to which the DATA and AMD signals of SDC connect through
a pull-up resistor. The power source is determined by the IO level of SD chipset. If the IO level is