Error (21087): Input port "CALCLK" must be driven by the same source

Description

You will see this error on Stratix® V, Arria® V, or Cyclone® V transceiver devices if you have more than one reconfiguration controller with different clock sources for the mgmt_clk_clk port if they share a single calibration block.

The number of calibration blocks is device dependent.

Resolution

To work around this problem, use a common mgmt_clk_clk.