What are the functional differences among FX3S, SD3, and SD2 and their reference designs?
FX3S, SD3, and SD2 supports two storage cards. However, these devices have variants that support only one storage card too.
There are two FX3S-based reference designs available in the Kits section here. Because SD3 and SD2 are the variants of FX3S, you can refer to the reference designs of FX3S.
1. FX3S RAID-on-Chip USB Dongle - The kit uses CYUSB3035 and is used to demonstrate the RAID1 functionality of FX3S. This supports only a 4-bit SD interface on both ports.
2. FX3S DVK - The kit uses CYUSB3035 and is used to demonstrate the functionality of FX3S. The kit supports two 8-bit storage ports that can be SD3.0, SDIO3.0, or eMMC 4.41. The kit comes with an 8-bit SD connector. eMMC paddle boards compatible with SD sockets can be used to evaluate eMMC. This also has P-port connector to connect FPGAs or application processors.