Speed Modes

Zynq UltraScale+ Device Technical Reference Manual (UG1085)

Document ID
UG1085
Release Date
2022-09-15
Revision
2.3 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 (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.