Hello Sivahari
Good day!
I recommend you take a look at:
AN13322 NXP SBC solution for Infineon AURIX TC2xx/TC3xx series MCU
FS26 Product Datasheet 4.5
These documents are located in the FS26 secure files; they don't cover it directly, but they give a general idea. I also found a couple of cases in the community that might be useful.
https://community.nxp.com/t5/Other-NXP-Products/FS26-FS-STATES-amp-SPI-Communication/m-p/2019073
I hope this information has helped you, please let me know if you need help with anything else.
Have a great day and best of luck.