The SD card speed modes are listed in Table: SD Card Speed Modes(1). The eMMC speed modes are listed in Table: eMMC Speed Modes. Table 26-1: SD Card Speed Modes(1) SD Speed Mode Data Rate Bus Width SD_CLK Frequency in MHz Throughput in MB/s SD Interface Voltage I/O Interface Support Default speed(2) Single 1, 4 25 12.5 3.3V MIO and EMIO High speed Single 1, 4 50 25 3.3V MIO SDR12 Single 4 25 12.5 1.8V MIO and EMIO SDR25 Single 4 50 25 1.8V MIO DDR50 Double 4 50 50 1.8V MIO SDR50 Single 4 100 50 1.8V MIO SDR104 Single 4 200 100 1.8V MIO Notes: 1.SD line selection is based on the SD 2.0 or 3.0 compliance. Refer to the Zynq UltraScale+ MPSoC Processing System Product Guide (PG201) [Ref 5]. 2.In the SD default speed mode with level shifter, the maximum frequency (FMAX) is 19 MHz. Table 26-2: eMMC Speed Modes eMMC Speed Mode Data Rate Bus Width Frequency in MHz Throughput in MB/s Voltage MIO/EMIO Support Legacy MMC speed(1)(2) Single 1, 4, 8 25 25 3.3V and 1.8V MIO and EMIO High-speed SDR Single 4, 8 50 50 3.3V and 1.8V MIO High-speed DDR Double 4, 8 50 100 3.3V and 1.8V MIO HS200 Single 4, 8 200 200 1.8V MIO Notes: 1.Legacy MMC speed relates to default eMMC speed. 2.The default eMMC boots in legacy MMC speed mode only. Your application must switch to the high-speed modes.