AR# 62528

Vivado Constraints - Critical Warning:[Constraints 18-551] Could not find an automatically derived clock matching the supplied criteria for renaming

Description

Vivado gives the following Critical Warning on my "create_generated_clock" constraint:

Critical Warning:[Constraints 18-551] Could not find an automatically derived clock matching the supplied criteria for renaming

How can I resolve it?
 

Solution

When renaming auto-derived clocks, a single "create_generated_clock" constraint has to specify one and only one auto-derived clock to rename.

A user-defined generated clock cannot be renamed.

Syntax:
create_generated_clock -name new_name [-source source_pin] [-master_clock master_clk] source_object

This Critical Warning indicates that no auto-derived clock is found in the design that meets the criteria specified in the "create_generated_clock" constraint.

The following are possible causes of this Critical Warning:

  1. A user-defined generated clock is created on the pin specified in the "source_object" argument.
  2. No master clock has been created for this generated clock. 
  3. Incorrect value specified for the -source, -master_clock or source_object argument.
    Use the report_clocks command to check for the correct value(s). 
AR# 62528
Date 10/21/2014
Status Active
Type Error Message
Tools