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Document No. 002-14949 Rev. *E
Page 62 of 113
PRELIMINARY
CYW43353
12.3 WLAN GPIO Signals and Strapping Options
The pins listed in
are sampled at power-on reset (POR) to determine the various operating modes. Sampling occurs a few
milliseconds after an internal POR or deassertion of the external POR. After the POR, each pin assumes the GPIO or alternative
function specified in the signal descriptions table. Each strapping option pin has an internal pull-up (PU) or pull-down (PD) resistor
that determines the default mode. To change the mode, connect an external PU resistor to VDDIO or a PD resistor to GND, using a
10 k
Ω
resistor or less.
Note:
Refer to the reference board schematics for more information.
Table 16. WLAN GPIO Functions and Strapping Options
Pin Name
WLBGA
Pin #
Default
Function
Description
GPIO_7
D4
1
SDIO_SEL
1
1.
and
GPIO_8
H1
0
SDIO_PADVDDIO
SDIO_CLK
B11
1
CPU-LESS
SDIO_DATA_2
D10
1
Table 17. SDIO/gSPI I/O Voltage Selection
SDIO_SEL
SPI_SEL
SDIO_PADVDDIO
Mode
1
X
0
1.8V I/O
1
X
1
3.3V I/O
0
1
0
1.8V I/O
0
1
1
3.3V I/O
0
0
X
3.3V I/O
Table 18. Host Interface Selection (WLBGA Package)
SDIO_SEL
SPI_SEL
CPULESS
Mode
1
X
X
SDIO Mode (3.3V or 1.8V I/O)
0
1
X
gSPI Mode (3.3V or 1.8V I/O)
0
0
0
Unsupported
0
0
1
Unsupported