AR# 41454

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13.1 PlanAhead - Unable to Swap Carry Chains in the PlanAhead Tool

Description

I am trying to swap two carry chain sites. However, Isee the following error:

"ERROR: Conflicting nets for physical connection driven by SLICE_X26Y80.A6LUT.O6: xyz_lut[0], Mismatched FF Groups."

How do I resolve this?

Solution

In certain situations, swap for carry chains is not feasible because there could be routability conflicts within the slice between the swapped carry chains and the flops that have not been swapped. Therefore,this is not possible.

In the 13.2 PlanAhead tool,this operation has been enhanced.If the operation is still not possible, the error message gives a clearerindication of the restrictions blocking the swap.

AR# 41454
Date 05/19/2012
Status Archive
Type Known Issues
Tools
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