5712 - MachXO3L: Does PLL clock outputs are glitch less when enabled or disabled via ENCLKO*?

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

  Follow these recommendations to generate several clock signal outputs with minimum jitter: 1. Use the PLL and the ODDR clocked by the edge clock. 2. Use a clock source with less jitter. 3. Use dedicated clock input routing pins to assign the clock to ...

• 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 ...

• 6192 - All Nexus: How to use the dynamic phase of PLL outputs?

  See Section - Dynamic Phase Adjustment of PLL user guide that explains the use of Dynamic Phase for PLL. Dynamic phase adjustment of the PLL output clocks can be done without reconfiguring the FPGA by using the dedicated dynamic phase-shift ports of ...

• 6131 - Certus-Nx: Are the outputs of the Nexus platform's sysCLOCK PLL synchronous signals?

  Solution: Yes, the outputs of the PLL (e.g. CLKOP, CLKOS, CLKOS2, etc.) are synchronous signals. But you can introduce dissimilar phase shifts to the outputs, either through static or dynamic mode phase adjustment which is available on the Nexus ...

• 873 - What types of issues could cause the PLL to lose lock?

  Situation: A CLKI input frequency to a PLL in a Lattice device is within the normal range for proper PLL operation, yet the PLL loses lock every now and then. Answer: As an example when using a LatticeXP2 device, check that the CLK signal that ...