Xilinx VCU118 User Manual

Also see for VCU118: Software Install and Board Setup Tutorial

Contents

Xilinx VCU118 User Manual Manual pdf 47 page image

VCU118 Board User Guide 47UG1224 (v1.0) December 15, 2016 www.xilinx.comChapter 3: Board Component DescriptionsProgrammable User Clock 2 (QSFP Clock)[Figure 2-1, callout 13]The VCU118 evaluation board has a SI570 I²C programmable low-jitter 3.3V LVDSdifferential oscillator (U38) connected to FPGA U1 GTY bank 231 MGTREFCLK0 P/N pins U9and U8 (series capacitor coupled), respectively.On power-up, the U32 SI570 user clock defaults to an output frequency of 156.250 MHz.The Zynq-7000 AP SoC system controller or FPGA user IP can change the output frequencywithin the range of 10 MHz to 810 MHz through an I²C interface. Power cycling the VCU118evaluation board resets the user clock to the default frequency of 156.250 MHz.• Programmable oscillator: Silicon Labs Si570BAB0000544DG (10 MHz-810 MHz)• Frequency tolerance: 50 ppm• 3.3V LVDS differential outputThe programmable clock circuit is shown in Figure 3-6.X-Ref Target - Figure 3-6Figure 3-6: VCU118 Board Programmable QSFP ClockX18002-100416Send Feedback