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PGA970: Enabling SPI without Internal MCU

Part Number: PGA970

Hi,

I want to use this device without using internal MCU. I will use external another MCU or FPGA. I'm plannig to use only SPI connection. However, there is a section in datasheet page 41 and it requires writing 1 to SPI_EN bit. How can I enable SPI communication of PGA970?

Thanks in advance