is UART interface of WILC3000 mandatory?

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I plan to use WILC3000 in one of my designs, but I would really like not to have to use the UART interface for Bluetooth and do all the communication via SPI or SDIO interface instead. The datasheet is not clear in this aspect and I don't know if this is possible.

Can anyone help me and explain if using the BT-UART interface is mandatory for WILC3000, or can I use only SPI/SDIO common for both WiFi and Bluetooth?

Thanks and best regards,