AR# 14265: Design Assistant for XST Help resolving "Xst:529 - Sources are: <inst1>:<sig>, <inst2>:<sig>" Warnings
Design Assistant for XST Help resolving "Xst:529 - Sources are: :, :" Warnings
Refer to this answer record for help resolving "Xst:529 - Sources are: <inst1>:<sig>, <inst2>:<sig>" warnings.
Note: This Answer Record is a part of the Xilinx Solution Center for XST (Xilinx Answer 38927). The Xilinx Solution Center for XST is available to address all questions related to XST. Whether you are starting a new design or troubleshooting a problem, use the Solution Center for XST to guide you to the right information.
This warning is presented to provide more information about multiple drivers on a particular signal. The instances listed (in this case, "inst1" and "inst2") assign a value to the signal (in this case, "sig") without a corresponding control to avoid contention. There might be more than two instances of this problem; all instances will be listed.
Check these instances and modify your code to avoid the existing contention.