描述

General Description:

In the XACT tools location constraints for unbonded pads used

the syntax of "Uxx", where "xx" corresponded to the pad

location for the unbonded I/O.

In the M1 tools location constraints for unbonded pads has

been changed to the format "UNBxx".

解决方案

To constrain an unbonded pad to a specific location in your

schematic design, add the "LOC=UNBxx" attribute to the UPAD

component on your schematic.

For example to constrain a unbonded pad to pad location 66 do

the following:

LOC=UNB66

In order to constrain an unbonded pad to a specific location

in a user constraint file (.ucf), add the following line to

your UCF file:

NET "NetName" LOC = "UNBxx"

where "NetName" is the name of the net connected to the UPAD.