Xilinx ML605 User Manual

Also see for Virtex-6 FPGA: User guide Guide Hardware setup guide User guide User guide

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Xilinx ML605 User Manual Manual pdf 39 page image

ML605 Hardware User Guide www.xilinx.com 39UG534 (v1.2.1) January 21, 2010Detailed Description12. USB-to-UART BridgeThe ML605 contains a Silicon Labs CP2103GM USB-to-UART bridge device (U34) whichallows connection to a host computer with a USB cable. The USB cable is supplied in thisevaluation kit (Type A end to host computer, Type Mini-B end to ML605 connector J21).Table 1-14 details the ML605 J21 pinout.Xilinx UART IP is expected to be implemented in the FPGA fabric (for instance, Xilinx XPSUART Lite. The FPGA supports the USB-to-UART bridge using four signal pins: Transmit(TX), Receive (RX), Request to Send (RTS), and Clear to Send (CTS).Silicon Labs provides royalty-free Virtual COM Port (VCP) drivers which permit theCP2103GM USB-to-UART bridge to appear as a COM port to host computercommunications application software (for example, HyperTerm or TeraTerm). The VCPdevice driver must be installed on the host PC prior to establishing communications withthe ML605. Refer to the evaluation kit Getting Started Guide for driver installationinstructions.ReferencesRefer to the Silicon Labs website for technical information on the CP2103GM and the VCPdrivers.In addition, see some of the Xilinx UART IP specifications at:• http://www.xilinx.com/support/documentation/ip_documentation/xps_uartlite.pdf• http://www.xilinx.com/support/documentation/ip_documentation/xps_uart16550.pdfTable 1-14: USB Type B Pin Assignments and Signal DefinitionsUSB ConnectorPin Signal Name Description1 VBUS +5V from host system (not used)2 USB_DATA_N Bidirectional differential serial data (N-side)3 USB_DATA_P Bidirectional differential serial data (P-side)4 GROUND Signal groundTable 1-15: USB-to-UART ConnectionsU1 FPGA Pin UART functionin FPGASchematic NetNameU34 CP2103GMPinUART Functionin CP2103GMT24 RTS, output USB_1_CTS 22 CTS, inputT23 CTS, input USB_1_RTS 23 RTS, outputJ25 TX, data out USB_1_RX 24 RXD, data inJ24 RX, data in USB_1_TX 25 TXD, data out