3.4.6.2 M.2 Wireless Interface
The SAMA7D65 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 SDMMC2, for the Wi-Fi® component of the add-on card. An optional SPI interface is also multiplexed with the SDMMC2 pins and is available after reworking the resistor switches named J5, J95, J96 and J98.
The M.2 slot also features an UART interface with hardware flow control for the Bluetooth® component of the add-on card.
An external oscillator (Y4) 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 (U30).
The MODE select header J46, present near the J43 slot, is reserved for future use.
|
PIO |
Signal Name |
Signal Description |
|---|---|---|
|
PC28 |
SDMMC2_0.SDMMC_CLK |
SDMMC2 clock signal |
|
PC27 |
SDMMC2_0.SDMMC_CMD |
SDMMC2 command line |
|
PC29 |
SDMMC2_0.SDMMC_DATA0 |
SDMMC2 data line 0 |
|
PC30 |
SDMMC2_0.SDMMC_DATA1 |
SDMMC2 data line 1 |
|
PC31 |
SDMMC2_0.SDMMC_DATA2 |
SDMMC2 data line 2 |
|
PD00 |
SDMMC2_0.SDMMC_DATA3 |
SDMMC2 data line 3 |
|
PD05 |
M2_BT_IO0_0.M2_BT_CTS |
Bluetooth UART clear to send signal |
|
PD03 |
M2_BT_IO0_0.M2_BT_RTS |
Bluetooth UART ready to send signal |
|
PD06 |
M2_BT_IO0_0.M2_BT_RX |
Bluetooth UART receive data signal |
|
PD07 |
M2_BT_IO0_0.M2_BT_TX |
Bluetooth UART transmit data signal |
|
PD01 |
M2_WIFI_IO0_0.M2_WIFI_IRQ |
M.2 device interrupt line |
|
PC28 |
M2_WIFI_IO0_0.M2_WIFI_MISO |
M.2 device serial data input |
|
PC27 |
M2_WIFI_IO0_0.M2_WIFI_MOSI |
M.2 device serial data output |
|
PD20 |
M2_WIFI_IO0_0.M2_WIFI_NRST |
M.2 device reset line |
|
PC29 |
M2_WIFI_IO0_0.M2_WIFI_SCK |
M.2 device serial clock signal |
|
PD02 |
M2_WIFI_IO0_0.M2_WIFI_TW_IRQ |
M.2 TWI host interrupt line |
|
PC06 |
M2_WIFI_IO0_0.M2_WIFI_TWCK |
M.2 device TWI clock signal |
|
PC07 |
M2_WIFI_IO0_0.M2_WIFI_TWD |
M.2 device TWI data signal |
|
PD04 |
M2_WIFI_IO0_0.M2_WIFI_WAKE |
M.2 host wake-up signal |
|
PIOBU2 |
AUX_IO0_0.PIOBU2 (M2_PIOBU_WAKE) |
M.2 host backup wake-up signal |