Introduction

What is SDIO?

• A SDIO (Secure Digital Input Output) card is an extension of the SD specification to cover I/O functions.
• Host devices that support SDIO can use the SD slot to support:
  1. GPS receivers.
  2. digital cameras.
  3. RFID readers.
  4. FM radio tuners.
  5. TV tuners.
  6. Wi-Fi.
  7. Bluetooth.

Many other SDIO devices have been proposed, but it is now more common for I/O devices to connect using the USB interface. - SDIO cards support most of the memory commands of SD cards. SDIO cards can be structured as 8 logical cards, although currently, the typical way that an SDIO card uses this capability is to structure itself as one I/O card and one memory card.

.. image:: /sdio1.png .. image:: /sdio2.png

Difference of SD/MMC/SDIO

Speed class rating

Reference

• Secure Digital wiki<http://en.wikipedia.org/wiki/Secure_Digital#SDIO>_
• SDIO接口介绍<http://en.wikipedia.org/wiki/Secure_Digital#SDIO>_
• Linux（open source）的 SD/MMC/SDIO 支援現況概要<http://en.wikipedia.org/wiki/Secure_Digital#SDIO>_
• SD/MMC/SDIO概念區分<http://en.wikipedia.org/wiki/Secure_Digital#SDIO>_
• STM32 控制 SD 卡<http://www.360doc.com/content/12/0411/15/9707346_202767012.shtml>_
• STM32 + SDIO + FATFS 文件系统 直讀 SD 卡<http://ntn314.blog.163.com/blog/static/16174358420112263456948/>_