1.6.1.3 Transmit PLL

The transmit PLLs reference clock and desired output clock are set to 125 MHz and 5000 Mbps, respectively.

Important: A few PolarFire Evaluation boards might have an inconsistent 125 MHz oscillator that does not consistently supply 125 MHz. Due to this behavior, there might be a mismatch between Tx and Rx words, resulting in payload error and a negative Rx_Lock status. If this occurs, change the clock source to the on-board 122.88 MHz oscillator by opening the J46 jumper pins. This changes the data rate to 
4.9152 Gbps. There is no other impact to the design.