UM0851 datasheet(94/245 Pages) STMICROELECTRONICS

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Communication device drivers

UM0851

94/245

Doc ID 16604 Rev 2

Features of the SD host controller

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Compliant to SD host controller, SDIO card and SD memory card standard

specification version 2.0

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Compliant to SD memory card security specification version 1.01

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Compliant to MMC specification version 3.31 and 4.2

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Supports both DMA (SDMA & ADMA) and Non-DMA mode of operation

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Supports MMC Plus and MMC Mobile

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Host clock rate variable between 0 and 52 MHz

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Supports 1 bit, 4 bit and 8 bit SD modes and SPI mode

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Up to 100 Mbits per second data rate using 4 parallel data lines (sd4 bit mode)

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Upto 416 Mbits per second data rate using 8 bit parallel data lines (sd8 bit mode)

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Cyclic redundancy check CRC7 for command and CRC16 for data integrity

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Error correction code (ECC) support for MMC4.2 cards.

4.7.2

Software overview

The SDIO host controller provides interface between the core driver layer of Linux MMC

stack and the underlying SDIO host controller. The SDIO host controller driver is present at

the drivers/mmc/host/spr_sdio_arasan.c file. The SDIO core driver layer is present in the

drivers/mmc/core folder in Linux. This layer provides an interface to card or function drivers,

which can use it to communicate with the SD/MMC/SDIO card. Card drivers are present in

the drivers/mmc/card folder in Linux. This layer can provide its own interface to the user, for

example the MMC card driver implemented in Linux provides a block driver interface to the

user. After inserting the card on the slot, you can access the MMC device nodes

(/dev/mmcblkp1, /dev/mmcblkp2, etc).

The following examples demonstrate how a card driver can access the functionalities

provided by the core driver layer.

Note:

The device nodes /dev/mmcblkp1 and /dev/mmcblkp2 are created because the disk has

partitions. If you use a generic disk or a disk without partitions then the generic dev node

/dev/mmcblk[0,1,2 ] are created.

The driver does not support ADMA feature of SDIO host controller.

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