KCU105 Board User Guide www.xilinx.com 50
UG917 (v1.4) September 25, 2015
Chapter 1: KCU105 Evaluation Board Features
Dual USB-to-UART Bridge
[Figure 1-2, callout 19]
The KCU105 evaluation board contains a Silicon Labs CP2105GM dual USB-to-UART bridge
device (U34) which allows a connection to a host computer with a USB port. The USB cable
is supplied in the KCU105 evaluation board kit (Standard Type-A end to host computer, Type
Micro-B end to KCU105 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
KCU105 evaluation board.
The dual UART interface connections are split between two components:
• UART1 SCI (standard) 4-wire interface is connected to the XCKU040 U1 device
• UART2 ECI (enhanced) 2-wire interface is connected to the XC7Z010 U111 Zynq-7000
AP SoC system controller
Tab le 1- 17 lists the dual-UART U34 connections to FPGA U1.
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 KCU105 evaluation board. The driver assigns the
higher PC COM port number to UART1 (SCI) and the lower PC COM port number to UART2
(ECI).
The Silicon Labs CP2105GM dual USB-to-UART bridge circuit is shown in Figure 1-21.
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