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AR# 34258

11.x NGDBuild - "ERROR:ConstraintSystem:59 - Constraint : NET/INST "xxx" not found"

Description


The following error occurs during Translate:
"ERROR:ConstraintSystem:59 - Constraint< xxx >: NET/INST "xxx" not found. Please verify that:
  1. The specified design element actually exists in the design.
  2. The specified object is spelled correctly in the constraint source file."

Solution

This error is issued when NGDBuild does not find the net or instance specified in the constraint in the UCF. Following are some possible causes of this problem:

  • The net/instance might have been removed during Synthesis or the net/instance name might have been changed by the Synthesis tool.
    Follow these steps to check:
  1. The net/instance name in the constraint is not correct.
    • If the net/instance is not in the top level, you need to specify its hierarchical pathwiththe name (e.g., controller/read_enable).
    • The net/instance name might have been changed by the Synthesis tool. Search the net/instance in the Technology Viewer or PlanAhead to find the exact name.
    • To prevent the Synthesis tool from changing the net name, apply a "KEEP" constraint to the net (refer to the Constraints Guide).
  2. The net/instancemight have been removed during Synthesis.
    • If you cannot find the net/instance in the Technology Viewer, check the Synthesis report to see if there are any messages stating that it was removed.
    • To prevent the Synthesis tool from removing the net, apply "KEEP" and "S" constraints to the net (refer to the Constraints Guide).

Linked Answer Records

Associated Answer Records

Answer Number Answer Title Version Found Version Resolved
39221 Constraints - "ERROR:ConstraintSystem:58 - Constraint : NET/INST "xxx" does not match any design objects" N/A N/A
AR# 34258
Date Created 03/02/2010
Last Updated 01/23/2013
Status Active
Type General Article
Tools
  • ISE Design Suite - 11.1
  • ISE Design Suite - 11.2
  • ISE Design Suite - 11.3
  • ISE Design Suite - 11.4