3.4.8.2 M.2 Wireless Interface
The SAM9X75 Curiosity Pro board features one M.2 interface for connecting compatible wireless add-on cards.
Only wireless cards compatible with the PCIe M.2 Key E slot (J43) are supported.
The main interface integrated in the M.2 slot is SDMMC1, for the Wi-Fi® component of the add-on card. An optional SPI interface is also multiplexed with the SDMMC1 pins and is available after reworking the resistor switches.
The M.2 slot also features a UART interface with hardware flow control for the Bluetooth® component of the add-on card.
An external oscillator provides the 32.768 kHz clock.
Other miscellaneous signals are present for reset, host interrupts and wake-up, device wake-up, TWI and PTA.
Power is provided by the auxiliary 3.3V supply.
The MODE select header, near the J43 slot, is reserved for future use.
| PIO | Signal Name | Signal Description |
|---|---|---|
| PA11 | SDMMC1_0.SDMMC_CLK | SDMMC1 clock signal |
| PA10 | SDMMC1_0.SDMMC_CMD | SDMMC1 command line |
| PA6 | SDMMC1_0.SDMMC_DATA1 | SDMMC1 data line 0 |
| PA7 | SDMMC1_0.SDMMC_DATA2 | SDMMC1 data line 1 |
| PA8 | SDMMC1_0.SDMMC_DATA3 | SDMMC1 data line 2 |
| PA11 | SDMMC1_0.SDMMC_CLK | SDMMC1 data line 3 |
| PA14 | M2_BT_IO0_0.M2_BT_CTS | Bluetooth UART clear to send signal |
| PA30 | M2_BT_IO0_0.M2_BT_RTS | Bluetooth UART ready to send signal |
| PA15 | M2_BT_IO0_0.M2_BT_RX | Bluetooth UART receive data signal |
| PA16 | M2_BT_IO0_0.M2_BT_TX | Bluetooth UART transmit data signal |
| PA13 | M2_WIFI_IO0_0.M2_WIFI_CS | M.2 device interrupt line |
| PC17 | M2_WIFI_IO0_0.M2_WIFI_IRQ | M.2 device serial data input |
| PA9 | M2_WIFI_IO0_0.M2_WIFI_MISO | M.2 device serial data output |
| PA10 | M2_WIFI_IO0_0.M2_WIFI_MOSI | M.2 device reset line |
| PA21 | M2_WIFI_IO0_0.M2_WIFI_NRST | M.2 device serial clock signal |
| PA11 | M2_WIFI_IO0_0.M2_WIFI_SCK | M.2 TWI host interrupt line |
| PA20 | M2_WIFI_IO0_0.M2_WIFI_TW_IRQ | M.2 device TWI clock signal |
| PC1 | M2_WIFI_IO0_0.M2_WIFI_TWCK | M.2 device TWI data signal |
| PC0 | M2_WIFI_IO0_0.M2_WIFI_TWD | M.2 host wake-up signal |
| PC16 | M2_WIFI_IO0_0.M2_WIFI_WAKE | M.2 host back-up wake-up signal |