Speed Modes

Zynq UltraScale+ Device Technical Reference Manual (UG1085)

Document ID: UG1085
Release Date: 2023-12-21
Revision: 2.4 English

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 (F_MAX) 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.