SDIO

From HwB

SDIO=Secure Digital Input/Output

Version of Secure Digital used to connect peripherals.

Three different modes are supported:

  • SD 4-bit mode (mandatory on high-speed cards)
  • SD 1-bit mode (mandatory on all cards)
  • SPI mode (mandatory on all cards)

Contents

Pinout

SD 4-bit mode

Pin Name Description
1 CD/DAT[3] Data line 3
2 CMD Command line
3 VSS1 Ground
4 VDD Supply voltage
5 CLK Clock
6 VSS2 Ground
7 DAT[0] Data line 0
8 DAT[1] Data line 1
9 DAT[2] Data line 2

SD 1-bit mode

Pin Name Description
1 n/c Not used
2 CMD Command line
3 VSS1 Ground
4 VDD Supply voltage
5 CLK Clock
6 VSS2 Ground
7 DATA Data line
8 IRQ Interrupt
9 RW Read/Write (optional)

SPI mode

Pin Name Description
1 CS Card Select
2 DI Data input
3 VSS1 Ground
4 VDD Supply voltage
5 CLK Clock
6 VSS2 Ground
7 DO Data output
8 IRQ Interrupt
9 n/c Not used

Related connectors

Links