Knowledge Base Article

Why am I seeing incorrect output clock frequencies when simulating the Altera_PLL megafunction?

Description
Due to a bug in the simulation models in the Quartus® II software through version 12.0, if you have multiple output clocks enabled in the Altera_PLL megafunction, the simulation results may show incorrect output frequencies.  This only affects the calculation of the output clock frequency in simulation, hardware is not affected.
Resolution
This issue is fixed in the Quartus II software version 12.0sp1.
Updated 1 month ago
Version 3.0
arria® v fpgas and socs
cyclone® v fpgas and socs
FPGA Dev Tools Quartus II Software
stratix® v fpgas
troubleshooting
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