When I use the Virtex-II startup block with the Clk port unconnected, synthesis fails and the following error appears:
"$/start/start.vhf",line 31: Error, CLK does not have an actual or default value."
You can work around this problem in two ways:
1. Assign a default value (:= 'X') to the startup component ports.
2. Add an unconnected net to the CLK port of the startup block.
- Change the "Consider Undriven Nets as" setting in ECS by going to Edit -> Preferences -> Check. Change this setting from "Error" to "Warning".