Warning 12283: Assignment INPUT_TERMINATION on transceiver refclk clk buf/pin pcie_ref_clk is not supported

Description

You get this warning in the Quartus® II software if you implement the assignment specified in the Transceiver Clocking in Stratix® V Devices chapter in volume 2 of the Stratix® V Device Handbook. 

The incorrect setting is:

set_instance_assignment -name INPUT_TERMINATION OFF -to <refclk_pin_name>

Resolution

The new recommendation is:

set_instance_assignment -name XCVR_REFCLK_PIN_TERMINATION DC_COUPLING_EXTERNAL_RESISTOR -to <refclk pin name>

This problem is fixed in the latest  Stratix® V Device Handbook.

Related Articles

• Warning (12283): Assignment INPUT_TERMINATION on transceiver refclk clk buf/pin is not supported