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The Silicon Labs CP2108 also provides as many as four user-defined GPIO signals for status and
control information (see the following table).
Table 25: CP2108 USB-to-UART Bridge User GPIO
RFSoC (U1)
Schematic
Net Name
Device (U32)
Pin
Function
Direction IOSTANDA
RD
Pin
Function
Direction
AY25
SelectIO
IN/OUT
LVCMOS18
UART_GPIO_0
41
GPIO
IN/OUT
AY24
SelectIO
IN/OUT
LVCMOS18
UART_GPIO_1
40
GPIO
IN/OUT
BA24
SelectIO
IN/OUT
LVCMOS18
UART_GPIO_2
38
GPIO
IN/OUT
BA23
SelectIO
IN/OUT
LVCMOS18
UART_GPIO_3
37
GPIO
IN/OUT
The connections between the RFSoC processor and the Silicon Labs CP2108 are listed in the
following table. This connection is a UART 0 controller on the processor.
Table 26: RFSoC to UART Connection
RFSoC (U1)
Schematic Net
Name
Device (U32)
Pin
Function
Direction IOSTANDA
RD
Pin
Function
Direction
C33
MIO35
TX
OUTPUT
MIO35_UART_TX
15
RX
INPUT
D31
MIO34
RX
INPUT
MIO34_UART_RX
16
TX
OUTPUT
The second port of the CP2108 USB to Quad-UART is connected to the onboard System
Controller.
Related Information
Default Jumper and Switch Positions
A list of jumpers and switches and their required positions for normal board operation is provided
in
Appendix B: Default Jumper Settings
.
Active Heat Sink and Power Connector
An active heat sink (see following figure) is provided for the RFSoC. A 12V fan is affixed to the
heat sink and is powered from the 3-pin friction lock header J99 (callout 19,
Chapter 1: ZCU1285 Board Features and Operation
UG1348 (v1.0) July 16, 2019
ZCU1285 Board User Guide
53