I have to design a big USB-hub that only full- or low-speed USBs will be connected to the downstream ports.
I've already made it with FE1.1 and four FE2.1. The first one converts 1 USB to 4 USBs, and each output will feed four FE2.1 converters, making 4*7 = 28 ports.
I did not use all the ports but it looks fine for the 8 ports I tested.
My questions are:
Has anyone ever designed such a big USB hub? What kind of ICs did you use?
I used these two cheap ICs. Does anyone here havr experience with a better IC?
How important is MTT selection versus STT? I feel the 1 to 4 converter which will feed the other 4 converters plays the key-roll.