Arria10 spread spectrum clocking

[sl242]

Hi,

I need to implement spread spectrum in a PLL. I found this option in the ALTPLL IP, which is no longer available for Arria10. Is there something similar?

I need a clock in the range of ~20-40MHz. If I implement this function manually via the PLL reconfiguration by changing the C counter, I get glitches on the clock output. Does anyone have an idea how to implement this?

Best Regards

[sl242 · Accepted solution]

I was able to solve the problem. I connected the output clock of the PLL with the reconfig_clk0. This enables a glitch-free change of the C-counter.

[JingyangTeh]

Hi

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Regards

Jingyang, Teh