SPRUI30H November 2015 – May 2024 DRA745 , DRA746 , DRA750 , DRA756
With UHS cards, the gap timing between two successive cards is extended from two cycles to four cycles. It provides more flexibility for the host Auto CMD12 arrival to receive the last complete and reliable block. The MMCHS controller follows only the left border case defined by the SD UHS specification.
Figure 25-29 shows Auto CMD12 timings during read transfer.
The Auto CMD12 arrival sent by the host controller is not sensitive to the MMC/SD bus configuration, whether it is a DDR or standard transfer and whether it is a 1-, 4-, or 8-bit bus width transfer.