TNM does not propagate through IBUF or BUFG components.
The Timing Name is placed on the input pad.
The TNM_NET constraint does propagate through IBUF and global clock buffers.
- Use TNM to group instances and macros (hierarchical blocks).
- To group input pads, use a TNM on the net, driven by a pad.
- Use TNM_NET to group several (many) logic elements driven by a net, such as clocks, clock enables, chip enables, read/writes, and resets.
You should use the following to group PADs:
NET "Test[*]" TNM = Test_GRP";
For more information on TNM and TNM_NET, please see (UG625) Constraints Guide.