Usb-To-Uart Bridge - Xilinx SP605 Hardware User's Manual

Chapter 1: SP605 Evaluation Board

12. USB-to-UART Bridge

The SP605 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 SP605 connector J23).
Table 1-16
Xilinx UART IP is expected to be implemented in the FPGA fabric (for instance, Xilinx XPS
UART 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 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 SP605. Refer to the evaluation kit Getting Started Guide for driver installation
instructions.
Table 1-16: USB Type B Pin Assignments and Signal Definitions
Table 1-17: USB-to-UART Connections
Notes:
1. The schematic net names correspond with the CP2103GM pin names and functions, and the UART IP
Refer to the
drivers.
In addition, see some of the Xilinx UART IP specifications at:
•
•
36
details the SP605 J23 pinout.
USB Connector
Signal Name
Pin
1 VBUS
2 USB_DATA_N
3 USB_DATA_P
4 GROUND
UART Function
U1 FPGA Pin
in FPGA
F18 RTS, output
F19 CTS, input
B21 TX, data out
H17 RX, data in
in the FPGA must be connected accordingly.
Silicon Labs website for technical information on the CP2103GM and the VCP
XPS UART Lite (DS571)
(DS577)
XPS 16550 UART
www.xilinx.com
+5V from host system (not used)
Bidirectional differential serial data (N-side)
Bidirectional differential serial data (P-side)
Signal ground
Schematic Net
Name
USB_1_CTS
USB_1_RTS
USB_1_RX
USB_1_TX
[Ref 13]
[Ref 14]
Description
U30 CP2103GM UART Function
Pin in CP2103GM
22 CTS, input
23 RTS, output
24 RXD, data in
25 TXD, data out
SP605 Hardware User Guide
UG526 (v1.9) February 14, 2019