StarterWare MMC

Introduction

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 salient features of the aforementioned HS-MMC host controller are:

• Full Compliance with MMC4.3 and SD/SDIO 2.0 command/response sets as defined in the Specification.
• 1-bit, 4-bit and 8-bit MMC/SD/SDIO modes. ('Note:' 8-bit mode is only for MMC)
• 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
• Maximum operating frequency of 48MHz
• MMC/SD card hot insertion.

Programming

Following are the steps to follow to initialize the controller for device access ---

• Check the presence of the card using HSMMCSDIsCardInserted()., If card is present, follow the below steps for controller inittialization.
• Reset the controller using HSMMCSDSoftReset().
• Reset the controller lines using HSMMCSDLinesReset.
• Set the supported voltages using HSMMCSDSupportedVoltSet().
• Enable the AutoIdle mode using HSMMCSDSystemConfig().
• Set the bus width using HSMMCSDBusWidthSet().
• Set the bus voltage using HSMMCSDBusVoltSet().
• Power on the bus using HSMMCSDBusPower().
• Set the output bus frequency using HSMMCSDBusFreqSet()
• Send the INIT stream to the card using HSMMCSDInitStreamSend().
• Enable the command completion, command timeout, data timeout and transfer completion interrupt using HSMMCSDIntrEnable()