VCU118 Board User Guide
80
UG1224 (v1.0) December 15, 2016
Chapter 3:
Board Component Descriptions
Dual USB-to-UART Bridge
[
, callout 21]
The VCU118 evaluation board contains a Silicon Labs CP2105GM dual USB-to-UART bridge
device (U34) that allows a connection to a host computer with a USB port. The USB cable is
supplied in the VCU118 evaluation kit (standard type-A end to host computer, type micro-B
end to VCU118 evaluation board connector J4). The CP2105GM is powered by the USB 5V
provided by the host PC when the USB cable is plugged into the USB port on the VCU118
evaluation board.
The dual UART interface connections are split between two components:
• UART1 SCI 4-wire interface is connected to the XCVU9P U1 FPGA
• UART2 ECI 2-wire interface is connected to the system controller
Silicon Labs provides royalty-free virtual COM port (VCP) drivers for the host computer.
These drivers permit the CP2105GM dual USB-to-UART Bridge to appear as a pair of COM
ports to communications application software (for example, Tera Term or HyperTerm) that
runs on the host computer. The VCP device drivers must be installed on the host PC prior to
establishing communications with the VCU118 evaluation board. The COM port driver list
will show an enhanced com port and a standard com port. The standard com port is
connected to the FPGA and UART IP must be implemented in the FPGA for communications
over this channel. The enhanced com port is connected to the system controller.
The Silicon Labs CP2105GM dual USB-to-UART bridge circuit is shown in
.
X-Ref Target - Figure 3-17
Figure 3-17:
VCU118 Dual UART CP2105GM
X17993-100416
