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)
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
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