How do I make a location assignment for fractional PLLs in Stratix® V devices?

You can make a location assignment for fractional PLLs in Stratix® V devices in the Quartus® II software by using the Assignment Editor and perform these steps:

1. In the Assignment Editor, set the Category to "Locations".
2. In the "To" column, select the PLL instance using the node finder.  It is helpful to narrow down the search by selecting *.gpll* as the filter.
3. In the "Assignment Name" column, select "Location".
4. Double click in the "Value" column and select "Fractional PLL" as the "Element" from the dropdown list.  This will allow you to specify valid X, Y, and N locations from a dropdown list.
5. Add "~FRACTIONAL_PLL" to the PLL instance assignment to assign the PLL location correctly.

For example, the node name in the "To" column should look similar to the following:

 altpll0:inst|altpll0_0002:altpll0_inst|altera_pll:altera_pll_i|general[0].gpll~FRACTIONAL_PLL

An example of the .qsf setting would be:

set_location_assignment FRACTIONALPLL_X0_Y122_N0 -to " altpll0:inst|altpll0_0002:altpll0_inst|altera_pll:altera_pll_i|general[0].gpll~FRACTIONAL_PLL"

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