Why does an IOPLL Intel® FPGA IP with dynamic reconfiguration enabled not lock during simulation when the mgmt_clk port is connected to an output clock of another IOPLL Intel® FPGA IP when using Intel® Arria® 10 devices?

Description

During simulation, an IOPLL Intel® FPGA IP with dynamic reconfiguration enabled may fail to lock when the mgmt_clk port of the PLL Reconfig Intel FPGA IP is connected to an output clock of another IOPLL Intel® FPGA IP in Intel® Arria® 10 devices. This behavior is only seen during simulation and it doesn't appear in hardware.

 

 

Resolution

As a workaround, connect the mgmt_clk port on the PLL Reconfig Intel® FPGA IP to a free running clock.