From Texas Instruments Embedded Processors Wiki

Contents 1 MMC Driver 1.1 Introduction 1.1.1 References 1.1.2 Acronyms & Definitions 1.1.3 Features

MMC Driver

Introduction

TI DM35x/37x/AM3517 has an multimedia card high-speed/secure data/secure digital I/O (MMC/SD/SDIO) host controller, which provides an interface between microprocessor and either MMC, SD memory cards, or SDIO cards. The current version of the user guide talks about the MMC/SD controller. The MMC driver is implemented on top of host controller as a HS-MMC controller driver and supports MMC, SD, SD High Speed and SDHC cards. The salient features of the aforementioned HS-MMC host controller are:

• Full compliance with MMC/SD command/response sets as defined in

the Specification.

• Support:

1-bit or 4-bit transfer mode specifications for SD and SDIO cards 1-bit, 4-bit, or 8-bit transfer mode specifications for MMC cards

• Built-in 1024-byte buffer for read or write
• 32-bit-wide access bus to maximize bus throughput
• Single interrupt line for multiple interrupt source events
• Two slave DMA channels (1 for TX, 1 for RX)
• Designed for low power and Programmable clock generation

References

1. MMCA Homepage [http://www.mmca.org/home]
2. SD ORG Homepage [http://www.sdcard.org/home]

Acronyms & Definitions

Audio Driver: Acronyms

Acronym	Definition
MMC	Multimedia Card
HS-MMC	High Speed MMC
SD	Secure Digital
SDHC	SD High Capacity
SDIO	SD Input/Output

Features

The MMC/SD/SDIO driver supports following features

• The driver is built in-kernel (part of vmlinux).
• MMC cards including High Speed cards.
• SD cards including SD High Speed and SDHC cards
• Uses block bounce buffer to aggregate scattered blocks

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