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3.12. SD Card Interface
SA800U-WF supports two SDIO interfaces (SDC2 and SDC4). The SDIO function of SDC4 is not
supported by default. As the SD card interface, SDC2 complies with SD 3.0 specifications. The pin
definition is shown below.
Table 14: Pin Definition of SD Card Interface
Pin Name
Pin No.
J1-151,
SD_LDO21A
J1-153,
J1-155
SD_LDO13A
J4-11
SD_CLK
J1-45
SD_CMD
J1-47
SD_DATA0
J1-51
SD_DATA1
J1-53
SD_DATA2
J1-57
SD_DATA3
J1-55
SD_DET
J1-49
SDC4_CLK
J1-86
SDC4_CMD
J1-92
SDC4_DATA0
J1-82
SDC4_DATA1
J1-84
SDC4_DATA2
J1-88
SDC4_DATA3
J1-90
SA800U-WF_Hardware_Design
I/O
Description
PO
SD card power supply
1.8/2.95 V output power for SD card
PO
pull-up circuits
DO
SD card clock
DO
SD card command
DIO
SDIO data bit 0
DIO
SDIO data bit 1
DIO
SDIO data bit 2
DIO
SDIO data bit 3
DI
SD card hot-plug detect
DO
SDIO clock
DO
SDIO command
DIO
SDIO data bit 0
DIO
SDIO data bit 1
DIO
SDIO data bit 2
DIO
SDIO data bit 3
Smart Module Series
SA800U-WF Hardware Design
Comment
Vnom = 2.95 V
I
max = 800 mA
O
Vnom = 1.8/2.95 V
I
max = 50 mA
O
Control
characteristic
impedance as 45 Ω.
Active low.
SDIO function is not
supported by default.
Can
be
multiplexed
into GPIOs.
57 / 106
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