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AXEL ULite Hardware Manual
6.1.3
MMC/SD/SDIO
The processor provides 2 MMC/SD/SDIO ports through the Ultra
Secured Digital Host Controller (USDHC), compliant with MMC V4.41,
Secure Digital Memory Card Specification V3.00 and Secure Digital Input
Output (SDIO) V3.00 specifications. The controller supports 1-bit / 4-bit
SD and SDIO modes, 1-bit /4-bit / 8-bit MMC modes. High capacity SD
cards (SDHC) are supported.
6.1.3.1
MMC/SD/SDIO1
The following table describes the interface signals:
Pin Name
SD1_CMD
SD1_CLK
SD1_DATA0
SD1_DATA1
SD1_DATA2
SD1_DATA3
The others SD1 pins – like SD1_CD, SD1_WP, etc. – are multiplexed on
different balls/connector pins.
Even if this interface is the primary recovery boot interface (if the internal
storage device is corrupted), its pins are multiplexed to many other
interfaces (FLEXCAN1, FLEXCAN2, SAI1, USB power controls pins)
6.1.4
SPI
AXEL ULite provides up to four SPI ports connected to the i.MX6
integrated Enhanced Configurable SPI (ECSPI) controller, featuring:
● Full-duplex synchronous serial interface
● Master/Slave configurable
● Up to four Chip Select (SS) signals to support multiple
● Transfer continuation function allows unlimited length data
Pin
J2.83
J2.85
J2.75
J2.77
J2.79
J2.81
Tab. 18: SD1 interface signals
peripherals
v.1.0.2
Internal Connections
CPU.SD1_CMD
CPU.SD1_CLK
CPU.SD1_DATA0
CPU.SD1_DATA1
CPU.SD1_DATA2
CPU.SD1_DATA3
August, 2019
Ball/pin #
C2
C1
B3
B2
B1
A2
39/65
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