device mode
enable usb ACM(usb serial) gadget function, and connect it to PC host.
1. register access
check if register access is ok or not.
2. utmi_clk
30MHz(16bit) or 60MHz(8bit)
3. device interrupt
connecttion event
reset event
4. control transfer
check utmi_data signal
EP SRAM/EP FIFO is ok or not, check EP SRAM clk
EP-out inetrrupt
EP-out and EP-in transfer
5. enumeration
get device descriptor
other descriptor
6. data transfer
bulk out and bulk in data transfer
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