SD Interface


Pin Signal type I/O Description
36 SD_CD 3V3 I SD Card Detect – connected to a GPIO
38 SD_D0 3V3 I/O SD Data bidirectional signals
37 SD_D1
42 SD_D2
41 SD_D3
40 SD_CMD 3V3 I/O SD Command bidirectional signal
39 SD_CLK 3V3 O SD Output Clock.

The QS standard pinout provides one dedicated SD interface.

SD-Card example diagram

Either the use of the processor internal pullups or the use of pullups on the baseboard is possible.

SDIO Design Recommendations

Parameter MIN TYP MAX
Operating Speed (Ultra-High Speed SD, SDR104)     208 MHz
Operating Speed (MMCplus, eMMC)     52 MHz
Signal Trace Length     10 cm
Data/Clock group skew (Ultra-High Speed SD, SDR104)     20 ps
Data/Clock group skew (MMCplus, eMMC)     100 ps
Trace Impedance   50 Ω  

QS Standard Contact Group Index

Pins Function Pins Function Pins Function Pins Function
1-4 SPI 5-10 I2C 11-14 CAN 15-18 SAI
19-35 Ethernet 36-42 SD Interface 43-48 USB 49-52 Power Supply, Reset and Boot mode
53-76 18-bit RGB Display Interface 77-78 Backlight and Display Control 53-72 Camera 79-88 MIPI DSI Display
89-96 UART 97-100 SPI 1A,75A,76A,100A PCIe 25A,26A,50A,51A USB3 Super Speed