CAUSE: | You assigned a gigabit transceiver block (GXB) transmitter PLL clock input pin to the dedicated GXB transmitter PLL clock input pin location in the device. As a result, the GXB transmitter PLL cannot be duplicated because I/O pins from the design cannot be duplicated. |
ACTION: | Modify the design to delete the location assignment for the GXB transmitter PLL clock input pin. |
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