IGEP
TM
SMARC iMX6
Hardware Reference Manual
ISEE 2007 S.L. All rights reserved, IGEP is a registered trademark from ISEE 2007 S.L. The following is provided for informational purposes only.
NIF:ESB64377005 Document:
MAN-IGEP0046-001
/ Revision:
1.3
/ Date:
23/06/2016
24
4.9
MMC: MULTI MEDIA CARD INTERFACE
The IGEP
TM
SMARC iMX6 has three MMC (Multi Media Card) interfaces. The first one (MMC1) is connected to
SDIO SMARC pins (as it is shown in Table 13 MMC pins), the second one (MMC2) is used into on-board WiFi
module and the third one (MMC3) is used into on-board eMMC flash.
The next example shows how to connect a uSD card reader to SDIO pins (page 78 of SMARC Design Guide).
Figure 17 MMC example: uSD card reader
Pin
Volt
Level
Dev
Pin
Main Function
Main
MUX
Type
Fixed
Function
Comments
P33
3V3
T2
SDIO_WP
6
IN
YES
MMC1 Write Protect. This signal has a 3K3 PU resistor.
P34
3V3
B21
SDIO_CMD
0
IO
NO
MMC1 Command
P35
3V3
T4
SDIO_CD#
6
IN
YES
MMC1 Card Detect. This signal has a 3K3 PU resistor.
P36
3V3
D20
SDIO_CK
0
IO
NO
MMC1 Clock
P37
3V3
F22
SDIO_PWR_EN
5
OUT
NO
MMC1 Card Power Enable
P39
3V3
A21
SDIO_D0
0
IO
NO
MMC1 Data Bus 0
P40
3V3
C20
SDIO_D1
0
IO
NO
MMC1 Data Bus 1
P41
3V3
E19
SDIO_D2
0
IO
NO
MMC1 Data Bus 2
P42
3V3
F18
SDIO_D3
0
IO
NO
MMC1 Data Bus 3
Table 13 MMC pins