Xilinx ZCU1285, User Manual

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RFSoC Processor Reference Clock
A free-running 33.3333333 MHz clock (U12) is the clock source for the RFSoC processor
(PS_REF_CLK).
300 MHz LVDS Oscillator
A 300 MHz LVDS oscillator U145 (SiTime SIT9107AI-243N25E300.0000) connects to global
clock (GC) pins on the RFSoC. The following table lists the RFSoC pin connections to the LVDS
oscillator.
Table 7: LVDS Oscillator GC Connections
RFSoC (U1)
Schematic
Net Name
Device (U145)
Pin Function Direction
I/O
Standard
Pin Function Direction
AP22 SYSTEM
CLOCK_P
Input LVDS LVDS_OSC_P 4 300 MHz LVDS
oscillator
Output
AR22 SYSTEM
CLOCK_N
Input LVDS LVDS_OSC_N 5 300 MHz LVDS
oscillator
Output
Differential SMA Pin Inputs
Two pairs of SMA connectors (callout 49, Figure 2: Board Component Locations ) provide access
to global clock (GC) pins on the RFSoC. The GC pins are connected to the SMA connectors as
shown in the following table.
Table 8: Differential SMA Clock Connections
RFSoC (U1)
Schematic Net
Name
SMA Connector
Pin Function Direction IOSTANDARD
AP26 USER CLOCK_1_P Input LVDS CLK_DIFF_1_P J84
AR26 USER CLOCK_1_N Input LVDS CLK_DIFF_1_N J85
AT23 USER CLOCK_2_P Input LVDS CLK_DIFF_2_P J83
AT24 USER CLOCK_2_N Input LVDS CLK_DIFF_2_N J86
User LEDs
Eight active-High LEDs, DS22 through DS26, and DS46 through DS48 (callout 43, Figure
2: Board Component Locations ), are connected to GPIO pins on the RFSoC. These LEDs can be
used to indicate status or other functions. Their pinout is listed in the following table.
Chapter 1: ZCU1285 Board Features and Operation
UG1348 (v1.0) July 16, 2019 www.xilinx.com
ZCU1285 Board User Guide 24
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