Features Of The Sd/Mmc Controller - Altera cyclone V Technical Reference

2016.10.28
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The hard processor system (HPS) provides a Secure Digital/Multimedia Card (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) non-removable flash devices.
The SD/MMC controller is based on the Synopsys DesignWare Mobile Storage Host (SD/MMC controller)
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
SD Association
To learn more about how SD technology works, visit the SD Association website (www.sdcard.org).

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
• Supports various types of multimedia cards, MMC version 4.41
• MMC: 1-bit data bus
• Reduced-size MMC (RSMMC): 1-bit and 4-bit data bus
• MMCPlus: 1-bit, 4-bit, and optional 8-bit data bus
• MMCMobile: 1-bit data bus
• Embedded MMC (eMMC): 1-bit and 4-bit data bus
• Integrated descriptor-based direct memory access (DMA)
• Internal 4 KB receive and transmit FIFO buffer
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