Wi-Fi&Bluetooth Module Series
FC905A_Hardware_Design 23 / 51
SDIO link). SDIO interface definition is as follows:
Table 8: Pin Definition of SDIO Interface
The following figure shows the SDIO interface connection between FC905A and host.
SDIO_CLK
SDIO_CMD
SDIO_DATA0
SDIO_DATA1
SDIO_DATA2
SDIO_DATA3
HOST
FC905A
SDIO_D0
SDIO_D1
SDIO_D2
SDIO_D3
SDIO_CLK
SDIO_CMD
1
0
K
VIO
N
M
_
1
0
K
N
M
_
1
0
K
N
M
_
1
0
K
N
M
_
1
0
K
NM
NM
NM
NM
NM
NM
N
M
_
1
0
K
Figure 4: SDIO Interface Connection
To ensure that the interface design complies with the SDIO 3.0 specification, the following principles are
recommended to be adopted:
Pin Name
Pin No.
1-bit Mode
4-bit Mode
SDIO_DATA2
14
NC
SDIO data bit 2
SDIO_DATA3
15
NC
SDIO data bit 3
SDIO_CMD
16
SDIO command
SDIO command
SDIO_CLK
17
SDIO clock
SDIO clock
SDIO_DATA0
18
SDIO data bit 0
SDIO data bit 0
SDIO_DATA1
19
IRQ
SDIO data bit 1
