| CAUSE: | You specified a migration device for the current design's target device. You have also made location assignments on pins in the migration device. However, the Quartus II software needs these pins to create VREF pins so that this design can be migrated to the migration device. |
| ACTION: | Make sure that there are no location assignments on pins that can potentially be VREF pins in the migration device. |
See also:
Overview: Making Assignments
Specifying Devices for Device Migration
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