In the case of Hub usage, SH7619 can not communicate with PC at Full Duplex mode. It can communicate at Auto Negotiation mode. Why?
In the case of Hub usage, SH7619 communicates with the Hub. It is not with the PC. So if SH7619 is fixed to Full Duplex mode, the Hub also needs to be fixed to Full Duplex mode. If the Hub is Auto Negotiation mode, the Hub will be Half Duplex mode by the parallel detection. So it can not Link.