General Description: During the netlist building stage of XST synthesis, the following warning occurs:
"WARNING:Xst:163 - Inserting OBUF on port <my_port> driven by tristate(s), possible simulation mismatch."
"WARNING:Xst:164 - Inserting OBUF on port <my_port<2>> driven by tristate(s), possible simulation mismatch."
This message indicates that XST acknowledges there are multiple internal 3-state buffers driving a single output port. Ensure that the control signals enabling the 3-state outputs are mutually exclusive.
These two warning messages differ only in the fact that "Xst:163" appears for single-bit signals and "Xst:164" appears for bits of buses.