SD Interface¶

Signals¶

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.

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