The AXI Quad SPI core is tested in hardware
with SPI slave devices such as Micron, Winbond, Macronix, and Spansion Flash memories in
standard SPI mode. Standard, dual, and quad modes are tested with Winbond, Micron,
Spansion, and Macronix SPI flash memories. Read the data sheet of the targeted SPI slave
flash memory or EEPROMs for the maximum speed of operation. Ensure that the correct
values are used when deciding on the AXI clock and selecting the Frequency Ratio
parameter. The AXI clock and the Frequency Ratio parameter determine the clock frequency
at the SCK pin of the core. While using different
external SPI slave devices, the Frequency Ratio parameter must be set carefully, and the
maximum clock frequencies supported by all the external SPI slave devices must be taken
into account.