If possible, can you elaborate more on the project that you're going to develop to better understand the requirements?
You can also share the details via personal message if not in the open forum.
Okay. I understand that you want to interface the WiFi module with the FX3S. Correct me, if I am wrong. For this, you need to use the host specific SDIO driver, in this case it is FX3S SDIO driver and you need to port the WiFi Host Driver (WHD) on the host side. WHD provides a set of APIs to interact with the Cypress WLAN chips. It's platform independent and you can choose your own set of network stack and RTOS.
You can find the below Github link that provides the guideline for WHD porting and also provides the reference manual for the APIs.-->
As of now the WHD supports only CYW4343W & CYW43012 & the modules derived form these 2 base parts. So, you can select the WiFi module accordingly.