Sd/Sdio/Mmc; Mmc/Sd/Sdio1 - Dave Embedded Systems AXEL LITE Hardware Manual

AXEL LITE Hardware Manual
JTAG_TMS
JTAG_TCK
JTAG_VREF
JTAG_nTRST
DGND
CPU_PORn
J7.8 and J7.9 pin are not connected.
7.11

SD/SDIO/MMC

The processor provides 4 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.
Three MMC/SD/SDIO interfaces are available on AXEL LITE SOM.
7.11.1

MMC/SD/SDIO1

The following table describes the interface signals:
SD1_CD
SD1_CLK
SD1_CMD
SD1_DATA0
SD1_DATA1
Pin name Conn.
Pin
J7.3
J7.2
J7.10
J7.6
J7.1
J7.7
Pin name
Function
JTAG TMS
JTAG clock
JTAG VREF
JTAG TRST
Ground
Please refer to Section 5.2.1.
Conn. Function
Pin
J2.28 Card detection pin
J2.85 Clock for
MMC/SD/SDIO card
J2.83 CMD line
J2.75 DATA0 line in all
modes
J2.77 DATA1 line in 4/8-bit
mode
October, 2016
v. 0.9.5
Notes
On board connector
On board connector
On board connector
On board connector
On board connector
Notes
If not used(for the
embedded
memory),tie low to
indicate there is a
card attached.
Also used to detect
busy state
Also used to detect
interrupt in 1/4-
bit mode
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