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AR# 42659

13.2 PlanAhead - INFO: [Coregen-103] The following IP NCF file has been automatically added to the constraints fileset

Description

When using PlanAhead I receive one of the following informational messages.

For newly generated IP:

INFO: [Coregen-103] The following IP NCF file has been automatically added to the constraints fileset: <Project Directory>/<Project>.srcs/sources_1/ip/axi_interconnect_v1_03_a_0/axi_interconnect_v1_03_a_0.ncf


For updated IP:

INFO: [Coregen-104] The following IP NCF file has been automatically updated in the constraints fileset: <Project Directory>/<Project>.srcs/sources_1/ip/axi_interconnect_v1_03_a_0/axi_interconnect_v1_03_a_0.ncf

 
Why is this NCF file being added to the constraints fileset?
 

Solution

The AXI Interconnect IP core included in the project requires the included NCF constraint file.

This is to ensure correct handling of clock domain crossings performed by the AXI Interconnect in the project design. 


Note:
When a project contains an AXI Interconnect IP core, Xilinx recommends using only one constraint set for the project. 

If multiple constraint sets are needed, a user should verify that the AXI Interconnect NCF file has been added to each constraint set in order to ensure correct timing.
AR# 42659
Date Created 06/20/2011
Last Updated 08/11/2014
Status Active
Type Known Issues
Tools
  • PlanAhead - 13.2