Describe: This is experimental DE2 board all the information on the USB Control, specifically Please take a closer look

File list(Click to check if it's the file you need, and recomment it at the bottom):
  DE2_USB_API\README.txt
  ...........\HW\async_receiver.v
  ...........\..\async_transmitter.v
  ...........\..\AUDIO_DAC.v
  ...........\..\CLK_LOCK.v
  ...........\..\CMD_Decode.v
  ...........\..\DE2_USB_API.pof
  ...........\..\DE2_USB_API.qpf
  ...........\..\DE2_USB_API.sof
  ...........\..\DE2_USB_API.v
  ...........\..\Flash_Command.h
  ...........\..\I2C_AV_Config.v
  ...........\..\I2C_Controller.v
  ...........\..\Img_DATA.hex
  ...........\..\LCD_Controller.v
  ...........\..\Multi_Sram.v
  ...........\..\ps2_keyboard.v
  ...........\..\Reset_Delay.v
  ...........\..\RS232_Command.h
  ...........\..\RS232_Controller.v
  ...........\..\SEG7_LUT.v
  ...........\..\SEG7_LUT_8.v
  ...........\..\SRAM_16Bit_512K.v
  ...........\..\USB_JTAG.v
  ...........\..\VGA_Audio_PLL.v
  ...........\..\Multi_Flash\Flash_Command.h
  ...........\..\...........\Flash_Controller.v
  ...........\..\...........\Flash_Multiplexer.v
  ...........\..\...........\Multi_Flash.v
  ...........\..\......Sdram\command.v
  ...........\..\...........\control_interface.v
  ...........\..\...........\Multi_Sdram.v
  ...........\..\...........\Params.v
  ...........\..\...........\PLL1.v
  ...........\..\...........\Sdram_Controller.v
  ...........\..\...........\Sdram_Multiplexer.v
  ...........\..\...........\Sdram_Params.h
  ...........\..\...........\sdr_data_path.v
  ...........\..\VGA_Controller\Img_DATA.hex
  ...........\..\..............\Img_RAM.v
  ...........\..\..............\VGA_Controller.v
  ...........\..\..............\VGA_OSD_RAM.v
  ...........\..\..............\VGA_Param.h
  ...........\..\..............\VGA_PLL.v
  ...........\SW\DE2_Control_Panel.exe
  ...........\..\DE2_USB_API.pof
  ...........\..\DE2_USB_API.sof
  ...........\..\FTD2XX.DLL
  ...........\..\Image_Convert_English.pdf
  ...........\..\ImgConv.exe
  ...........\HW\Multi_Flash
  ...........\..\Multi_Sdram
  ...........\..\VGA_Controller
  ...........\HW
  ...........\SW
  DE2_USB_API

 To Search: vhdl de2 VHDL USB 

 [USB.rar] - the pdf file of USB2.0
 [usbFPGAconnect.rar] - The routine is a PC, through the FX2-CY7C68013-A of the USB2.0 controller chip and the FPGA to achieve communication. One of the projects and code, in