Minimum input frequency for Cyclone II PLLs

[Altera_Forum]

I am going with a design propably coming with less than 10MHz oscillator frequency were some PLLs might be added in the future. I remember, that it has been said (somewhere in documentation) that there is a minimal input frequency required for the PLL to work properly. 

 What can be said about that?

[Altera_Forum]

When you use the PLL Megafunction wizard you are asked to enter the PLL input clock frequency. The wizard will automatically tell you if you are inside or outside the admitted range.

[Altera_Forum]

You can as well check the Cyclone II Handbook, Volume 1 Page 5-66 

 Lokla

[Altera_Forum]

Thanks, somehow I did not find that, however.