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RMcin1
Beginner
1,143 Views

Do any Altera FPGAs provide spread spectrum PLLs?

I have found documentation that implies that the ALTPLL can be configured to generate spread spectrum clocking. The Megawizard has a section under "Bandwidth/SS" that would be where this would be set up, but the function is "dimmed" and can't be selected, regardless of the device I select.

 

So is there a part that allows this?

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Abe
Valued Contributor II
66 Views

The SS feature of ALTPLLs are supported only in Stratix IV and higher devices. You can refer to the PLL (ALTPLL) user guide's SS section (pages 19,20) here for more details :

 

https://www.intel.com/content/dam/www/programmable/us/en/pdfs/literature/ug/ug_altpll.pdf

Abe
Valued Contributor II
66 Views

Apparently the newer MAx10 FPGAs do support SST in their PLLs. You can refer this link for more info

 

https://www.intel.com/content/www/us/en/programmable/documentation/mcn1395213337540.html#fntarg_3

 

sst.JPG

 

sst_max10.JPG

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