FPGA USB device原型验证流程及调试手段

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