PXA3xx Design Guide - Marvell

12 MultiMediaCard/SD/SDIO Card ControllerThis section describes guidelines to interface the MultiMediaCard (MMC)/Secure Digital(SD)/Secure Digital IO (SDIO) controller of PXA3xx processor family to MMC/SD/SDIO sockets foruse with MMC, SD, and SDIO card devices.12.1 Overview12.2 SignalsThe PXA3xx processor family has two MMC/SD/SDIO controllers that perform the following tasks:• Act as links between the software used to access the PXA3xx processor family and theMMC/SD/ SDIO devices• Supports:• MultiMediaCard• Secure Digital• Secure Digital I/O• SPI communication protocolsThe MMC/SD/SDIO controller supports:• MMC, SD, and SDIO card systems• Low-cost data storage and communications systems1The PXA3xx processor family MMC/SD/SDIO controller is based on the standards outlined in thesespecifications:• MultiMediaCard System Specification, Version 3.3.1• SD Memory Card Specification, Version 1.1• SDIO Card Specification, Version 1.0The MMC/SD/SDIO controller supports the translation protocol from a standard MMC/SD/SDIO orserial peripheral interface (SPI) bus to the MMC/SD/SDIO card devices. The software used toaccess the PXA3xx processor family must indicate whether to use MMC, SD card, SDIO card, orSPI protocol to communicate with the MMC/SD/SDIO controller.See Table 36 for the description of MMC/SD/SDIO card controller signal functions.Table 36:Multimedia Card/SD/SDIO Card Controller Interface Signal SummarySignalDirection(MMC/SD/SDIO Mode)Direction(SPI Mode)DescriptionMMC/SD/SDIO Card Controller #1MM1_CLK Output Output MultiMediaCard and SD Card Bus Clock—MMC/SD/SDIOController #1Copyright © 2009 MarvellDoc. No. MV-S301368-00 Rev. AApril 6, 2009, Released Page 95