10.2.7.1.3 Fusion Static PLL Core Restrictions

After you make all your selections, the software generates a core with your configurations. However, there are a number of restrictions in the possible values for the input and output frequencies. They are:

• Input to the PLL must be between 1.5 and 350 MHz
• Output from the PLL must be between 1.5 and 350 MHz
• The reference input to the PLL core (fin/n) must be between 1.5 and 5.5 MHz. The PLL Core output must be between 24 and 350 (fin *m/n) .

If the software cannot generate the frequency you requested, it tries to generate a frequency that is as close as possible after it satisfies all the mentioned conditions. It prints a message in the Log file indicating the actual PLL output frequency. If more than one output is specified, the software tries to find the multiplication and division factors with the smallest total error among all the outputs.