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AR# 11589

12.1 NGDBuild/Constraint - "ERROR:NGD:635 - Specification "OFFSET=IN

Description

The following NGDBuild error occurs:

"ERROR:NGD:635 - Specification "OFFSET=IN <time>ps before <signal_name>" on signal "<problem_signal> (for_INT)" is not valid, because this signal is not connected directly to a pad."

Solution

The error above is associated with the following constraint:

NET "<problem_signal>*" OFFSET= IN <time>ns before <signal_name>;

NOTE: The "*" indicates that you want to include each bit in the bus on this constraint.

To avoid this error, place parentheses around the "*", as in the following example:

NET "<problem_signal>(*)" OFFSET= IN <time>ns before <signal_name>;

Both of these signal names must be associated with pads.

For more details on timing constraints, please see the Timing Constraints User Guide:http://www.xilinx.com/support/documentation/sw_manuals/xilinx12_1/ug612.pdf

AR# 11589
Date Created 08/29/2007
Last Updated 05/13/2012
Status Archive
Type Error Message