SD/MMC SPI

"Features
Supports MultiMedia Card (MMC) and Secure Digital (SD) card in serial peripheral interface (SPI) mode
Variable data rate up to 20 Mbps
Hardware assisted cyclic redundancy check (CRC) calculation
Low-level hardware abstraction layer (HAL) drivers included
Windows utility for raw data read/write access on PC platform
Includes prototyping adapter for Altera® and El Camino Nios® II development boards
Optional file allocation tables FAT12/FAT16 stand-alone Nios II file system

Description
The SD/MMC SPI core with Altera Avalon® bus interface allows the designer to easily connect SOPC Builder systems to standard MMC and SD card flash-based memory devices. The MMC and SD cards are universal, low-cost data storage and communication media widely used in consumer products such as digital cameras and cellular phones. The SD/MMC SPI core is fully compliant with SOPC Builder and integrates easily into any SOPC Builder-generated system.

For the Nios II processor, El Camino provides low-level driver routines for the SD/MMC SPI core. The drivers provide universal access routines for MMC and SD memory devices, eliminating the need for additional low-level code to read or write raw data from or to the SD/MMC cards."