User's Manual

Doc No.
Rev
1.0
Document released Date.
15/8/25
Page
15
Description
WM-BN-BM-26_A User Manual
12 SDIO_DATA_0 I/O SDIO Data line 0, external pull-up resistor needed(10-100K ohm)
14 SDIO_DATA_1 I/O SDIO Data line 1 or interrupt, external pull-up resistor needed (10-
100K ohm)
10 SDIO_DATA_2 I/O SDIO Data line 2, external pull-up resistor needed(10-100K ohm)
13 SDIO_DATA_3 I/O SDIO Data line 3, external pull-up resistor needed(10-100K ohm)
1 bit mode
Pin# Symbol I/O Description
8 SDIO_CLK I SDIO Input Clock from Host (up to 50 MHz), external loader
capacitor is optional
11 SDIO_CMD I/O SDIO Command Line, external pull-up resistor needed(10-100K
ohm)
12 SDIO_DATA I/O SDIO Data line, external pull-up resistor needed(10-100K ohm)
14 SDIO_IRQ I/O IRQ interrupt, external pull-up resistor needed(10-100K ohm)
10 N/C I/O Not used
13 N/C I/O Not used
SPI Signals Default Status
The SPI interface (slave mode) is multiplexed with SDIO lines, and behaves similarly to
the SDIO interface on functionality, register, and addressing level. The below table
describes the SPI slave mode pins.
SPI Slave Mode Pins Description
Pin# Symbol SPI Type SPI Mode Description
8 SDIO_CLK I SPI_CLK SPI Serial Clock, Output from master; can range
to 50 MHz
11 SDIO_CMD I SPI_DI Master Output, Slave Input Output from master
12 SDIO_DATA_0 O SPI_DO Master Input, Slave Output from slave
14 SDIO_DATA_1 O SPI_IRQ SPI Interrupt from WIFI chip to Host
10 SDIO_DATA_2 O N/C Not used
13 SDIO_DATA_3 I SPI_CS Slave Select Output from master
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