AXI4-Lite Interface Dual/Quad SPI Mode — Optional FIFO Depth - 3.2 English

PG153 AXI Quad SPI Product Guide

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3.2 English

When the core is configured in dual or quad SPI mode, the FIFO is always present and there is the option to choose its depth. The depth of this FIFO can be either 16 or 256. The width of the FIFO in this mode is always 8 bits.