The FT600 is a high speed USB 3.0 FIFO bridge with up to 5Gbps of bandwidth. It comes with the option of 16 and 32 bits wide parallel FIFO interface. FT600Q is a 56-pin QFN package with the 16-bit option and FT601Q is a 76-pin QFN package with the 32-bit wide FIFO bus interface. Both of these chips support up to 8 endpoints other than the management endpoints.
For more detail: High Speed USB 3.0 interface with a single chip