SPRUJ55D September 2023 – July 2025 AM263P2 , AM263P2-Q1 , AM263P4 , AM263P4-Q1
There are two types of data transfer:
There are specific commands for each type of operation (sequential or block-oriented). See the Multimedia Card System Specification, the SD Memory Card Specifications, and the SDIO Card Specification.
Stream commands are supported only by MMC cards.
Figure 13-120 and Figure 13-121 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 mmc_cmd line.
Figure 13-120 Sequential Read Operation (MMC Cards Only)
Figure 13-121 Sequential Write Operation (MMC Cards Only)Figure 13-122 and Figure 13-123 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 mmc_cmd line. These operations are available for all kinds of cards.
Figure 13-122 Multiple Block Read Operation (MMC Cards Only)
Figure 13-123 Multiple Block Write Operation (MMC Cards Only)