Connect the STM32U575 OCTOSPI interface to fm25w256 in single SPI mode. Configure OCTOSPI as shown in the following figure

fm25w256 read and write function is realized by the conventional command protocol, the timing is as follows:

How is the software implemented, please provide reference or guidance。

thank you

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Regarding to this OCTOSPI application, you can refer to aplication note AN5050 and AN4760.

But, the fm25w256 is a standard SPI interface chip, why don't you use the SPI directly?