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What does it mean? |
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In general it means that the system has too many constraints, and there's no solution to the gradient descent problem. In practice it's often that the density or routing is too dense, and the global placer can't find a way to fit everything in. The error message could be improved. It's a signal by the tool that you need to reconstrain your design in some way. |
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Ok thanks for the explanation. Indeed the message could be improved. Someone else has just entered an issue #6323. |
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In general it means that the system has too many constraints, and there's no solution to the gradient descent problem.
In practice it's often that the density or routing is too dense, and the global placer can't find a way to fit everything in. The error message could be improved. It's a signal by the tool that you need to reconstrain your design in some way.