Hi @diverger,
Please refer the below Answer Record for the timing constraints examples of SPI EMIO.
https://www.xilinx.com/support/answers/63174.html
Refer below link and go to page 89
https://www.xilinx.com/support/documentation/ip_documentation/axi_quad_spi/v3_2/pg153-axi-quad-spi.pdf
Best Regards
Abhinay PS
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