I have a schematic for a 4 port USB hub (4 output ports, 1 input port). I'd like to make two of these hubs and connect them together, thus making a 7 or 8 port USB hub on a single PCB. I know there are 7 port hub ICs, but I find them harder to use, plus I have this schematic already tested.
I can think of two ways to connect these 4 port hubs together. First way, which I'm pretty sure will work, is to connect one of the hub A's output ports to hub B's input port. This way however we get a total of 7 usable USB ports.
The second way, which I'm not sure if it will work, is to use only one input port, but clone its USB signals - they go both into hub A and hub B. This way we get a total of 8 usable ports. But would that work? I know the differential signals are a bit tricky, so I'm not sure if cloning them like this would be acceptable.