Embedian, Inc.
56
SMARC-iMX8MM Computer on Module User’s Manual
v. 1.2
2.1.11
SD/SDMMC
Interface
SMARC
‐
iMX8MM
is
configured
to
support
two
MMC
controllers.
One
is
used
for
on
‐
module
8
‐
bit
eMMC
support,
and
the
other
one
is
used
for
external
SDHC/SDIO
interface.
The
SMARC
‐
iMX8MM
module
supports
one
4
‐
bit
SDIO
interface,
per
the
SMARC
2.0
specification.
The
SDIO
interface
uses
3.3V
signaling,
per
the
SMARC
spec
and
for
compatibility
with
commonly
available
SDIO
cards.
The
following
figure
shows
the
SDIO
block
diagram.
Figure
8.
SD/SDIO/eMMC
Interface
Block
Diagram