STM32U595AI datasheet(91/377 Pages) STMICROELECTRONICS

91 / 377 page

DS13633 Rev 1

91/377

STM32U59xxx

Functional overview

SD memory card and SD I/O card system specifications are available through the SD card

Association website at www.sdcard.org.

The SDMMC features include the following:

•

Compliance with Embedded MultiMediaCard System Specification Version 5.1

Card support for three different databus modes: 1-bit (default), 4-bit and 8-bit

(HS200 SDMMC_CK speed limited to maximum allowed I/O speed) (HS400 is not

supported).

•

Full compatibility with previous versions of MultiMediaCards (backward compatibility).

•

Full compliance with SD memory card specifications version 6.0

(SDR104 SDMMC_CK speed limited to maximum allowed I/O speed, SPI mode and

UHS-II mode not supported).

•

Full compliance with SDIO card specification version 4.0

Card support for two different databus modes: 1-bit (default) and 4-bit

(SDR104 SDMMC_CK speed limited to maximum allowed I/O speed, SPI mode and

UHS-II mode not supported).

•

Data transfer up to 208 Mbyte/s for the 8-bit mode

(Depending maximum allowed I/O speed).

•

Data and command output enable signals to control external bidirectional drivers

•

IDMA linked list support

The MultiMediaCard/SD bus connects cards to the host.

The current version of the SDMMC supports only one SD/SDIO/e•MMC card at any one

time and a stack of e•MMC.

When SDMMC peripherals are used simultaneously:

•

Only one can be used in e•MMC with 8-bit bus width.

•

The SDMMC1 SDIO voltage switch use is mutually exclusive with SDMMC2 interfacing

e•MMC with 8-bit bus width, as follows:

–

If SDMMC1 has to support SDIO UHS-I modes (SDR12, SDR25, SDR50,

SDR104 or DDR50), SDMMC2 cannot support e•MMC with 8-bit bus width.

–

if SDMMC2 has to support e•MMC with 8-bit bus width, SDMMC1 supports only

SDIO default mode and high-speed mode.

Table 24. SDMMC features

SDMMC modes/features(1)

1. X = supported.

SDMMC1

SDMMC2

Variable delay (SDR104, HS200)

SDMMC_CKIN

SDMMC_CDIR, SDMMC_D0DIR

SDMMC_D123DIR

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