9.1i MAP - If two signals are LOC'd to the same pad location, a "pack error" results

AR#	8926	Search For Another Answer
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Last Updated	07/10/2007
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Description

Keywords: MAP, design constraints, I/O component, ERROR:Pack:679, 679, pack

MAP issues the following error:

"ERROR:Pack:679 - Unable to obey design constraints (LOC = Y4) that require the combination of the following symbols into a single I/O component:
PAD symbol "strtstop.PAD" (Pad Signal = strtstop)
BUF symbol "strtstop_IBUF" (Output Signal = strtstop_IBUF)
PAD symbol "reset.PAD" (Pad Signal = reset)
More than one pad symbol. Please correct the design constraints accordingly. Problem encountered during the packing phase."

Solution

1

In this case, the pack error occurred because two different signals were incorrectly assigned to the same pad location.

To avoid this error, assign each signal to a separate pad.

2

Check the pin locks in your UCF. If there is an asterisk (*) character in a signal's name, it will be interpreted as a wild card character, and this will result in multiple signals being locked to a single pad.