Usb-To-Uart Bridge - Xilinx SP601 User Manual

References
See the Marvell Alaska Gigabit Ethernet Transceiver product page for more information at
http://www.marvell.com/products/transceivers/alaska_gigabit/index.jsp.
Also, see the Xilinx Tri-Mode Ethernet MAC User Guide at
http://www.xilinx.com/support/documentation/ip_documentation/tri_mode_eth_ma
c_ug138.pdf.

6. USB-to-UART Bridge

The SP601 contains a Silicon Labs CP2103GM USB-to-UART bridge device (U4) which
allows connection to a host computer with a USB cable. The USB cable is supplied in this
evaluation kit (Type A end to host computer, Type Mini-B end to SP601 connector J9).
Table 1-10
Xilinx UART IP is expected to be implemented in the FPGA fabric. 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 the
CP2103GM USB-to-UART bridge to appear as a COM port to host computer
communications application software (for example, HyperTerm or TeraTerm). The VCP
device driver must be installed on the host PC prior to establishing communications with
the SP601. Refer to the SP601 Getting Started Guide for driver installation instructions.
Table 1-10: USB Type B Pin Assignments and Signal Definitions
Table 1-11: CP2103GM Connections
X-Ref Target - Figure 1-12
SP601 Hardware User Guide
UG518 (v1.1) August 19, 2009
details the SP601 J9 pinout.
USB Connector
Signal Name
Pin
1 VBUS
2 USB_DATA_N
3 USB_DATA_P
4 GROUND
FPGA U1
Schematic Netname
Pin
U10 USB_1_CTS
T5 USB_1_RTS
L12 USB_1_RX
K14 USB_1_TX
NET "USB_1_CTS"
NET "USB_1_RTS"
NET "USB_1_RX"
NET "USB_1_TX"
Figure 1-12: UCF Location Constraints for CP2103GM Connections
www.xilinx.com
Description
+5V from host system (not used)
Bidirectional differential serial data (N-side)
Bidirectional differential serial data (P-side)
Signal ground
U4 CP2103GM
22
23
24
25
LOC = "U10";
LOC = "T5";
LOC = "L12";
LOC = "K14";
Detailed Description
25