This application report and associated code implements the interfacing of Secure Digital (SD) or Multi-Media Card (MMC) types of Flash memory cards with the TMS320F28xxx digital signal controllers (DSCs). These cards can use serial peripheral interface (SPI) or parallel (SD) interface to connect to the host. This application report demonstrates the SPI mode and includes the schematics showing the interconnections and the software routines. This is basic driver software, providing basic functionality. You can add the SD/MMC commands and additional functions required per application. This document covers SD versions 1.10 and the new 2.00 specifications, meant for SD high capacity (SDHC) cards.