vivado post-synthesis functional simulation

if your testbench has a module that is included in the top design, the post-synthesis functional simulation will go wrong.

You should rename the sub-module for the testbench, as the testbench and the top design should not use the same module.

ex. 

The top design has a sub-module named crc_tst.v, and the testbench also has the same sub-module named crc_tst.v.

Then the post-synthesis functional simulation will go wrong.

solution.

Rename the crc_tst.v inculded in testbench, using a different name.

Then the simulaiton will be right.