Sd/Mmc Controller; Features Of The Sd/Mmc Controller - Altera Cyclone V Device Handbook

2013.12.30
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The hard processor system (HPS) provides a Secure Digital/MultiMediaCard (SD/MMC) controller for
interfacing to external SD and MMC flash cards, secure digital I/O (SDIO) devices, and Consumer Electronics
Advanced Transport Architecture (CE-ATA) hard drives. The SD/MMC controller enables you to store
boot images and boot the processor system from the removable flash card. You can also use the flash card
to expand the on-board storage capacity for larger applications or user data. Other applications include
interfacing to embedded SD (eSD) and embedded MMC (eMMC) nonremovable flash devices.
The SD/MMC controller is based on the Synopsys
(DWC_mobile_storage) controller.
This document refers to SD/SDIO commands, which are documented in detail in the Physical Layer Simplified
Specification, Version 3.01 and the SDIO Simplified Specification Version 2.00 described on the SD Association
website.
Related Information
www.sdcard.org
To learn more about how SD technology works, visit the SD Association website.

Features of the SD/MMC Controller

The HPS SD/MMC controller offers the following features:
• Supports HPS boot from mobile storage
• Supports the following standards or card types:
• SD, including eSD version 3.0
• SDIO, including embedded SDIO (eSDIO) version 3.0
• CE-ATA version 1.1
• MMC, including eMMC
MMC Support Matrix)
• Integrated descriptor-based direct memory access (DMA)
• Internal 4 KB receive and transmit FIFO buffer
The SD/MMC controller does not directly support voltage switching, card interrupts, or back-end power
control of eSDIO card devices. However, you can connect these signals to general-purpose I/Os (GPIOs).
The SD/MMC controller does not contain a reset output as part of the external card interface. To reset the
flash card device, consider using a general purpose output pin.
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