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 should be set carefully, and the maximum clock
frequencies supported by all the external SPI slave devices should
be taken into account.