1. 打开Vivado,进入时序约束(Timing Contraints),可以看到Set Input Jitter 和 Set System Jitter、Set Clock Uncertainty 2. 点击Set Clock Uncertainty,单击上方+号添加新约束。 3. Uncertainty value 设置不确定时间 Uncertainty applies to设置不确定时间的应用范围, Clock Uncertainty Type下可以选择使用Simple uncerta...
spartan6里面虽然含有独立的PLL和DCM,但是已经不直接支持你通过IPcore独立的使用了,取而代之是叫做“Clocking Wizard”,它帮你决定是用pll还是dcm还是全用。如果你执意用pll,只能通过原语,pll原语如下:PLL_BASE #(.BANDWIDTH("OPTIMIZED"), // "HIGH", "LOW" or "OPTIMIZED".CLKFBOUT_MULT(...
(Note, if this is the first time you are running the Calibrate scope jitter/noise, you may be asked to run the jitter wizard first. The wizard can help to optimize the vertical & horizontal scales, memory depth, clock recovery, etc.) Figure 14. Remove Scope Random Jitter configuration men...
set_input_jitter [get_clocks -of_objects [get_ports -scoped_to_current_instance clk_in1\\]] 0.100 When the Clocking Wizard input clock source is set to "Global buffer" or "No buffer," no primary clock is created on the hierarchical pin. Identification: The problem described above is det...
set_input_jitter [get_clocks -of_objects [get_ports -scoped_to_current_instance clk_in1\\]] 0.100 When the Clocking Wizard input clock source is set to "Global buffer" or "No buffer," no primary clock is created on the hierarchical pin. ...
•Added new --mode option to the PCIeDataCompare command line tool. Use to calculate additive jitter and to perform scope noise correction on data with spread spectrum. ‘--mode additive' will add an extra column containing the Root Subtration of the squares of the buffer input and output ...
Using the Clocking Wizard to setup a PLL or MMCM is not an option for your design. One reason is (as you say) the PLL/MMCM cannot operate with an input clock that varies in frrequency from 10KHz to 200MHz. Another reason is that the PLL and MMCM have a minimum input frequency, ...
(3) This is applicable only if the input clock jitter is within the input jitter tolerance specifications. (4) The dedicated path between adjacent PLLs is not available on L1, L4, R1, and R4 PLLs. (5) The smallest phase shift is determined by the voltage-controlled oscillator (VCO) ...
Infineon has a broad portfolio of CYPRESS™ clock generators with frequency support of 700 MHz and RMS phase jitter of less than 0.7 ps. They support a host of value-added features such as VCXO, spread-spectrum, and output phase alignment, along with supporting reference clocks for popular ...
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