Answers Database

FPGA Express: "XNF Bus style" checkbox in Synthesis->Options->Project defined


Record #3781

Product Family:  Software

Product Line:  Synopsys

Problem Title:
FPGA Express: "XNF Bus style" checkbox in Synthesis->Options->Project
defined



Problem Description:
Keywords: Foundation Express, FPGA Express, bus, <, >, naming convention, XNF

Urgency: Standard

General Description:
XNF files written by FPGA Express (1.x, 2.0.x) will always use angle brackets
when defining buses (i.e. BUS<3>).  There is no way to alter this
functionality.

Under Synthesis->Options->Project, there is a field to alter the "XNF Bus
style".  However, this field refers only to incoming XNF files read by Express.
This is necessary to allow Express to re-assemble buses.

Xilinx recommends treating XNF modules as black boxes instead of reading these
files in for re-optimization, as re-optimization has shown to cause problems
for some designs.  See (Xilinx Solution 3508) for more details.


Solution 1:

Any modification of bus naming conventions within files produced by Express
must be done manually.	Using your favorite text editor, globally search for
and replace the angle brackets, "<" and ">".

See (Xilinx Solution 2076) for more information.



End of Record #3781