Intel® Arria® 10 Hard Processor System Technical Reference Manual
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16.4.2. Data Slave Interface
The quad SPI flash controller uses the data slave interface for direct, indirect, and SPI legacy mode accesses.
The data slave interface is 32 bits wide and permits byte, half-word, and word accesses. For write accesses, incrementing burst lengths of 1, 4, 8 and 16 are supported. For read accesses, all burst types and sizes are supported.