Usb To Quad-Uart Bridge - Xilinx ZCU1285 User Manual

USB to Quad-UART Bridge

A USB to Quad-UART bridge (U32, Silicon Laboratories CP2108) is used for simultaneous serial
communication between a host terminal (115200-8-N-1) and the RFSoC PL and PS, and the
System Controller. The onboard USB Micro-B receptacle USB connector J1 (callout 5,
2: Board Component
Each UART port has four signals: transmit (TX), receive (RX), request-to-send (RTS), and clear-to-
send (CTS). RTS and CTS are only connected on the UART interface 0 port and are not connected
on the other two ports.
• UART interface 0 is connected to RFSoC bank 66
• UART interface 1 is connected to the System Controller
• UART interface 2 is connected to RFSoC bank 501
• UART interface 3 is not connected
Silicon Labs provides royalty-free virtual COM port (VCP) drivers for the host computer. These
drivers permit the CP2108 to appear as four COM ports to communications application software
(for example, Tera Term or Hyper Terminal) that runs on the host computer.
Figure 19: Silicon Labs USB-to-UART Bridge Standard COM Port
IMPORTANT! Install the VCP device drivers on the host PC before establishing communications with the
ZCU1285 board.
The connections between the RFSoC PL bank 66 and the Silicon Labs CP2108 are listed in the
following table.
Table 24: RFSoC PL to UART Connection
Pin Function
BB25 RTS
BA25 CTS
BB23 TX
BB22 RX
UG1348 (v1.0) July 16, 2019
ZCU1285 Board User Guide
Locations) is connected to the quad-UART bridge.
RFSoC (U1)
IOSTANDA
Direction
RD
OUTPUT LVCMOS18
INPUT LVCMOS18
OUTPUT LVCMOS18
INPUT LVCMOS18
Chapter 1: ZCU1285 Board Features and Operation
Schematic Net
Name
Pin
UART_CTS_I_B 54
UART_RTS_O_B 55
UART_TXD_O 56
UART_RXD_I 57
Send Feedback
Figure
Device (U32)
Function Direction
CTS INPUT
RTS OUTPUT
RX INPUT
TX OUTPUT
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