I am using XAPP589 or XAPP1241. During pre_opt.tcl, I get the following warnings and error:
What is the root cause of the error?
How can I work around it?
This error occurs when REF_CLK_I is driven by a LUT6, and pre_op.tcl finds that this LUT6 is part of the PICXO macro.
To work around the problem, you can replace the inference of the LUT6 by an instantiation of three LUT3 or two LUT3 and a MUXF.
It is not illegal to drive REF_CLK_I with a LUT6.
This error will be corrected in a future version of the XAPP.