The FT600 and FT601 are both USB 3.0 to FIFO interface chips supporting the USB 3.0 Super Speed (5 Gb/s) and USB 2.0 High Speed (480 Mb/s) data transfer standards.
The FT600Q has a 16-bit wide FIFO bus interface and comes in a 56-pin QFN package while the FT601Q uses a 32-bit wide FIFO interface, packaged in a 76-pin QFN outline. The FT601 and FT600 support both the single-in and single-out 245 FIFO interfacing standard and the multi-channel FIFO mode which can handle a total of 8 channels (4 INs and 4 OUTs). The FIFO interface can support multi-voltage I/O (1.8 V, 2.5 V or 3.3 V) and an operating frequency of 66.67 MHz or 100 MHz (100 MHz only for 2.5 V and 3.3 V).
The devices support Link Power Management (LPM) to give improved power saving and also supports Suspend and Remote Wake-up signalling. If the USB is in suspend mode and Remote Wake-up has been enabled, driving the WAKEUP_N pin low causes the FT600 to request a ‘resume from suspend’ on the USB bus.
For more detail: FTDI Launch USB 3.0 Chip