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How to import Synplify's XNF netlist into the Foundation schematic?
How to instantiate XNF netlist imported from Synplicity's Synplify
into the Foundation schematic editor?
If the customer wishes to take an XNF file from Synplify and create a
module for it in a Foundation schematic, then the XNF file should be a
"lower-level" file, not a top-level. This means that it should not have
EXTs and IBUF/OBUFs. Rather, it should simply have SIG records for all
the ports. Secondly, the importing of the XNF macro works most smoothly
when the bus indices are notated like DATA<0>, DATA<1>, etc. (Synplify
follows this convention)
To create the "lower-level" XNF file within Synplify, select Target ->
Set Device Options -> Disable I/O Insertion from the menu, then the I/O
cells will not be inserted and EXT records will not be created. However,
the SIG records will not be created if customers are using a version of
Synplify that pre-dates Synplify 3.0c1. Customers are urged to upgrade to
a more recent version of Synplify from Synplicity:
Put this file into the project directory. Go to Foundation schematic
editor, select Hierarchy -> create macro symbol from netlist, and choose
the modified XNF file. The symbol whose name is the same as the XNF file
will be added to the component library.
Customers are urged to migrate to a version of Foundation above F1.3.
In F1.3, when the XNF file was imported into Foundation, the XNF was being converted
into EDIF. In the process of doing this, some XNF-specific attributes
(specifically INV properties on pins) were being lost. Actually, the INV
property was being passed to the EDIF, but INV is not a legal EDIF
property, thus is was being ignored. The workaround for this problem
was to create a black-box symbol, and point to the XNF file. Then,
there was another problem in how the bus pins weren't getting matched to
the underlying netlist when the symbol was created manually, and thus
the NEXT workaround of creating individual pins for each bit of the
bus. In F1.4, Foundation no longer converts the XNF file into EDIF upon
importation. Now, the XNF is treated like a black-box, and the Xilinx
translation tools (NGDBUILD) take care of converting the XNF to NGD. The
bus issue is also resolved, because upon importing the XNF file, the
symbol is created properly. In F1.4, these problems are resolved.