3.4.6.2 M.2 Wireless Interface
The SAMA7D65-Curiosity Kit 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 (J11) are supported.
The main interface integrated in the M.2 slot is SDMMC2, for the WiFi component of the add-on card. An optional SPI interface is also multiplexed with the SDMMC2 pins and is available by changing the JP5 jumper position on the J12 header.
The M.2 slot also features a UART interface with hardware flow control for the Bluetooth component of the add-on card.
An external 32.768-kHz 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 ensured by the auxiliary 3.3V supply (U1).
The MODE select header J12, near the J11 slot, is reserved for future use.
| PIO | Signal Name | Signal Description |
|---|---|---|
PC28 | SDMMC2_CK_PC28 | SDMMC2 Clock signal |
PC27 | SDMMC2_CMD_PC27 | SDMMC2 command line |
PD20 | WIFI_RSTN_PD20 | M.2 device reset line |
PC29 | SDMMC2_DAT0_PC29 | SDMMC2 data line 0 |
PC30 | SDMMC2_DAT1_PC30 | SDMMC2 data line 1 |
PC31 | SDMMC2_DAT2_PC31 | SDMMC2 data line 2 |
PD0 | SDMMC2_DAT3_PD0 | SDMMC2 data line 3 |
PC7 | WIFI_TWD_PC7 | M.2 device TWI Data signal |
PC6 | WIFI_TWCK_PC6 | M.2 device TWI Clock signal |
PD4 | WIFI_WAKE_HOST_PD4 | M.2 host Wake-up signal |
PD1 | WIFI_IRQN_PD1 | M.2 device interrupt line |
PD2 | WIFI_TWI_IRQ_PD2 | M.2 TWI host interrupt line |
PD7 | BT_TXD_PD7 | Bluetooth UART Transmit Data signal |
PD6 | BT_RXD_PD6 | Bluetooth UART Receive Data signal |
PD5 | BT_CTS_PD5 | Bluetooth UART Clear to Send signal |
PD3 | BT_RTS_PD3 | Bluetooth UART Ready to Send signal |
PC27 | WIFI_SPI_MOSI_PC27 | M.2 device serial data input |
PC28 | WIFI_SPI_MISO_PC28 | M.2 device serial data output |
PC29 | WIFI_SPI_SCK_PC29 | M.2 device serial Clock signal |
PIOBU0 | PIOBU0_WAKE | M.2 host back-up Wake-up signal |