4736 - All Devices: How to improve the jitter value of the PLL clock output?

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• 4753 - iCE40 UltraPlus: Error: "The system clock frequency on the PLL output Port A must be between 4 and 133.33 MHz."

  For Phase and Delay compensation modes of PLL, the PLL configuration tool of iCECube shows the following error: "The system clock frequency on the PLL output Port A must be between 4 and 133.33 MHz.". However, the data sheet indicates that the max ...

• 1155 - Why won't the second PLL in a cascaded PLL design achieve lock during simulation?

  My design uses 2 PLLs that are cascaded; i.e the output of the 1st PLL is the input of the 2nd PLL. The 1st PLL functions fine in simulations but the 2nd PLL will not achieve lock and the output frequency is not correct. The input frequency of the ...

• 1686 - What is the impact and potential problems when the reference clock input of the PLL in the FPGA is lower than the specification defined in datasheet?  

  It is common for most of today’s FPGA’s to provide multiple PLLs to support the flexible clock requirements needed for today's complex system design. The PLL has a specific frequency operational range. For example, the LatticeXP2 datasheet indicates ...

• 6506 - PLL: When will the reset of the PLL be released? If the reset is released before the input clock to the PLL stabilizes (or is input), the PLL does not output the clock and Lock signals.

  Definition: When will the reset of the PLL be released? If the reset is released before the input clock to the PLL stabilizes (or is input), the PLL does not output the clock and Lock signals. Solution: Please find section 14.5.3 of FPGA-TN-02095 on ...

• 6441 - PLL for Nexus FPGAs: How to dynamically change the PLL output frequency?

  Description: On FPGA-TN-02095, locate Appendix C. PLL LMMI Operation. The user can access the PLL dynamic parameters through the use of LMMI (Lattice Memory Mapped Interface). Solution: If the user wants to vary the output frequency (for example ...