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Automotive Module Series
AG35 Hardware Design
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3.14. SDIO Interfaces
AG35 provides two SDIO interfaces which support SD 3.0 protocol.
3.14.1. SDIO1 Interface
SDIO1 interface is used for WLAN function. More details are provided in Chapter 3.16.
3.14.2. SDIO2 Interface
SDIO2 interface supports SD card.
The following tables show the pin definition of SDIO2 interface.
Table 20: Pin Definition of SDIO2 Interface
Pin Name
Pin No.
I/O
Description
Comment
SDC2_DATA3
48
IO
SDIO data signal (bit 3)
SDIO signal level can be
selected according to the
one supported by SD card.
Please refer to SD 3.0
protocol for more details.
SDC2_DATA2
47
IO
SDIO data signal (bit 2)
SDC2_DATA1
50
IO
SDIO data signal (bit 1)
SDC2_DATA0
49
IO
SDIO data signal (bit 0)
SDC2_CLK
53
DO
SDIO bus clock
SDC2_CMD
51
IO
SDIO command signal
VDD_SDIO
46
PO
SDIO pull up power source
1.8V/2.85V configurable
output. Cannot be used for
SD card power supply.
SD_INS_DET
52
DI
Insertion detection for SD card
The following figure shows a reference design of SD card interface.