Answers Database

PLD_DA/EDIF2XNF 5.x: LOC properties placed on pads do not appear in netlist


Record #429

Product Family:  Software

Product Line:  Mentor

Problem Title:
PLD_DA/EDIF2XNF 5.x: LOC properties placed on pads do not appear in
netlist



Problem Description:
Users who have used releases of the DS344 prior to version 5.0, or those
converting v7 designs to v8, may notice that in XACT 5.x, properties placed
on I/O pads do not appear in the resulting XNF netlist.  The most common
indication of this problem is that LOC properties on I/O are ignored,
causing unexpected pin placement.

In the XACT 5.0 release, the CLASS=P property was added to the I/O pad
symbols to improve compatiblity with other Mentor tools (most notably, to
improve board-level simulation).  One unfortunate side effect of this is
that properties placed on the I/O are now ignored.

See page 4-6 of the XACT 5.0 Mentor Interface User's Guide for more
information.


Solution 1:

The workaround is to place the properties on the net or buffer associated
with the PAD.

See page 4-6 of the Mentor Graphics Interface/Tutorial Guide (previously
known as the Mentor Version 8 Interface User Guide) for more information.



End of Record #429