There are many different aspects of SD and MMC interfacees and this white paper organize them into a very easy to understand format. One must understand the different characteristics of these ...

The iWave SD v2.0 Controller interfaces a SD/MMC/SDIO card to any processor with a generic interface. The interface towards the SD card is realized by the SD protocol implemented in the controller. ..

His solution? The Raspberry Pi series of chips has a special function on a bunch of the GPIO pins that make it easier to talk to SDIO devices. SDIO is an extension of the SPI-like protocol that ...