3.2.4. Reference Clock Network
The reference clock network distributes a reference clock source to either the entire left or right side of the FPGA where the transceivers reside. This allows any reference clock pin to drive any transmitter PLL on the same side of the device. Designs using multiple transmitter PLLs which require the same reference clock frequency and are located along the same side of the device, can share the same dedicated reference clock (refclk) pin.
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