SPRUI30H November 2015 – May 2024 DRA745 , DRA746 , DRA750 , DRA756
There are two types of data transfer:
There are specific commands for each type of operation (sequential or block-oriented).
For information about commands and programming sequences supported by the MMC, SD, and SDIO cards, see the Multimedia Card System Specification, SD Memory Card Specifications, and SDIO Card Specification (Part E1).
Figure 25-3 and Figure 25-4 show how sequential operations are defined. Sequential operation is only for 1-bit transfer and initiates a continuous data stream. The transfer terminates when a stop command follows on the mmci_cmd line.
Stream commands are supported only by MMC cards.
Figure 25-5 and Figure 25-6 show how multiple block-oriented operations are defined. A multiple block-oriented operation sends a data block plus CRC bits. The transfer terminates when a stop command follows on the mmci_cmd line. These operations are available for all kinds of cards.