SPI Read and Write Transactions
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As with all SPI communications, transactions start when the -CS line goes LOW and end when the -CS line goes HIGH.
SPI write transaction
SPI read transaction
Register address sent in bytes 2 and 3 of every SPI transaction will auto-increment with each data byte send to or received from the FPGA.
This allows you to write or read multiple registers within the span of a single transaction.