On ARM official website, I saw some description about debug method by Freescale Vybrid.
It sounds like below (No JTAG or SW connection):
[PC Host] <--- USB wire ---> [Freescale Vybrid]
So it seems there is a bridge inside Vybrid, which is between USB module and DAP.
Inside Vybrid:
[USB I/O] <---> [USB module] <---> [Bridge] <---> [DAP]
Does ARM have such kind of bridge converting USB transaction to JTAG/SW DAP transaction ?
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