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A HardCopy^™ design should not contain more than one VREF pin that is assigned to a HardCopy test pin in a I/O bank in a HardCopy device. The assignment of two or more VREF pins to HardCopy test pins can cause a contention of the VREF bus.

The Design Assistant lists the HardCopy test pins in each of a HardCopy device's I/O banks in the Messages window, the Messages section of the Compilation Report window, and the Design Assistant HardCopy Test Pins section of the Compilation Report window. You should use this information to make sure you do not assign two or more VREF pins in a design to HardCopy test pins.

The Fitter may have assigned the VREF pins to the HardCopy test pins during compilation. To prevent the Fitter from making these assignments during the next compilation, create and assign the VREF pins instead of allowing the Fitter to do so.

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