Xilinx Synthesis Technology User Guide

XST Naming Conventions
This appendix discusses net naming and instance naming
conventions.
Net Naming Conventions
Appendix A
These rules are listed in order of naming priority.
1. Maintain external pin names.
2. Keep hierarchy in signal names, using underscores as hierarchy
designators.
3. Maintain output signal names of registers, including state bits.
Use the hierarchical name from the level where the register was
inferred.
4. Ensure that output signals of clock buffers get _clockbuffertype
(like _BUFGP or _IBUFG) follow the clock signal name.
5. Maintain input nets to registers and tristates names.
6. Maintain names of signals connected to primitives and black
boxes.
7. Name output net names of IBUFs using the form net_name_IBUF.
For example, for an IBUF with an output net name of DIN, the
output IBUF net name is DIN_IBUF.
Name input net names to OBUFs using the form net_name_OBUF.
For example, for an OBUF with an input net name of DOUT, the
input OBUF net name is DOUT_OBUF.
XST User Guide A-1