User's Guide

xE922-3GR Hardware User Guide
1VV0301272 Rev.0.8 2017-01-05
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Reserved. Page 74 of 112
12.3. SDMMC/SDIO
SDIO: SD 3.0, 1x 4bit, speed up to DDR50 (clk 48MHz) / SDR50 (clk 96MHz), only 1.8V supported
SDMMC: SD 3.0, 1x 4bit, default mode 26MHz, including power supply VDD_SD (fixed to 2.9V) and card
detect
Note:
In case SDMMC 1.8V support is needed, an external 3.0V voltage regulator should be added (ENABLE pin
controlled by VDD_SD line), to supply card VDD pin of the card holder.
PAD
Signal
I/O
descriptions Type
SD/MMC Card Interface
AP15
VDD_SD
-
Power supply out for SDMMC card
2.9V
J2
SD_CARD_DET
I
MMC card detect(active low)
CMOS_1.8V
F1
SD_DAT0
I/O
MMC card data 0
CMOS_1.8/3V
H1
SD_DAT1
I/O
MMC card data 1
CMOS_1.8/3V
K1
SD_DAT2
I/O
MMC card data 2
CMOS_1.8/3V
M1
SD_DAT3
O
MMC card data3
CMOS_1.8/3V
E2
SD_CLK
O
MMC card clock
CMOS_1.8/3V
G2
SD_CMD
I/O
MMC card command
CMOS_1.8/3V
SDIO Interface
L4
SDIO_CLK
I/O
CLK
CMOS 1.8V
P3
SDIO_CMD
I/O
CMD
CMOS 1.8V
P1
SDIO_DAT0
I/O
SD0
CMOS 1.8V
N2
SDIO_DAT1
I/O
SD1
CMOS 1.8V
M3
SDIO_DAT2
I/O
SD2
CMOS 1.8V
N4
SDIO_DAT3
I/O
SD3
CMOS 1.8V