ADLINK Technology SMARC NXP LEC-IMX8M, User Manual

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LEC-iMX8M User’s Guide SGET SMARC Rev 2.1
Page 37 copyright © 2021 ADLINK Technology Inc.
4.3.9 SDIO
Name Pin # Description I/O
Type I/O
Level Power
Domain PU / PD Comments
SDIO_D0
SDIO_D1
SDIO_D2
SDIO_D3 P39
P40
P41
P42 SDIO Data lines. These signals operate in push-pull
mode. I/O
CMOS 1.8V or
3.3V Runtime SDIO controller will detect SD Cards voltage
level (1.8V for UHS-I and 3.3V for standard)
and adjust its I/O voltage level accordingly
SDIO_WP P33 SDIO Write Protect. This signal denotes the state
of the write-protect tab on SD cards. I OD
CMOS 3.3V Runtime PU 10k Pulled up on module
SDIO_CMD P34 SDIO Command/Response. This signal is used for
card initialization and for command transfers. During
initialization mode this signal is open drain. During
command transfer this signal is in push-pull mode. I/O
CMOS 1.8V or
3.3V Runtime SDIO controller will detect SD Cards voltage
level (1.8V for UHS-I and 3.3V for standard)
and adjust its I/O voltage level accordingly
SDIO_CD# P35 SDIO Card Detect.
This signal indicates when a SDIO/MMC card is
present. I OD
CMOS 3.3V Runtime PU 10k Pulled up on module
SDIO_CK P36 SDIO Clock. With each cycle of this signal a one-bit
transfer on the command and each data line occurs. O
CMOS 1.8V or
3.3V Runtime
SDIO_PWR_EN P37 SDIO Power Enable. This signal is used to
enable the power being supplied to a SD/MMC card
device. O
CMOS 3.3V Runtime should be driven low in STB Mode by the
module