Detailed SDIO protocol Implementation
Reference: Wikipedia, https://www.sdcard.org/developers/overview/sdio/sdio_spec/Simplified_SDIO_Card_Spec.pdf SDIO cards are intended to provide high speed data Input/Output on our regular sd card slot. SDIO cards are compatible with any sd card slot and will not cause any physical damage to the host if it's not compatible with SDIO. When SDIO is plugged in a SDIO compatible host, in its early stage it is in low power mode and consumes very little current. Host identifies the SDIO card ,it's power requirement, it's I/O capabilities etc. If host finds that power requirement is manageable and there is driver for the I/O functionality card is offering it allows the SDIO card to power up completely and start it's I/O functions. SDIO card allows up to 7 different I/O functions along with 1 memory function. It's available in market in 2 form factors: miniSDIO and full size SDIO. For example http://www.spectec.com.tw/sdw-822..html is a miniSDIO wifi card by spectec. Typ...