UPGRADE YOUR BROWSER

We have detected your current browser version is not the latest one. Xilinx.com uses the latest web technologies to bring you the best online experience possible. Please upgrade to a Xilinx.com supported browser:Chrome, Firefox, Internet Explorer 11, Safari. Thank you!

AR# 52692

14.2 Route - WARNING:Route 463 The router has detected a very dense congested design It is extremely unlikely the router will be able to finish

Description

When routing an IBERT design through an Artix A200T device the following error is returned:

WARNING:Route 463 The router has detected a very dense congested design
It is extremely unlikely the router will be able to finish the design and meet your requirements
To prevent excessive run time the router will exit with a partially routed design
This behavior will allow you to identify difficult designs earlier
The cause of this behavior is either overly difficult constraints putting too much logic into this device or an issue with the implementation
If you would prefer a fully routed design ease the constraints if any
remove some logic from the design or change the placement before running router again
If you are willing to accept a long run time set the option xe c to override the present behavior
Updating file exampleibertbank216top.ncd with current partially routed design
WARNING:Route 543 This design is experiencing routing congestion Please review the Xilinx Routing Optimization White Paper WP381 on
   www.xilinx.com for guidelines and techniques in resolving this issue
WARNING:Route 563 
    Router will not fix hold error
Phase  4 13400 unroutedSetup0 Hold878 Component Switching Limit0     REAL time 1 mins 32 secs
Total REAL time to Router completion 1 mins 32 secs
Total CPU time to Router completion 1 mins 29 secs

Solution

To resolve this issue set the extra effort level to "continue on impossible" in Map (-xe c)

With this option enabled the design will route completely.

Note this issue is resolved in 2012.4.

AR# 52692
Date Created 10/31/2012
Last Updated 07/31/2014
Status Active
Type General Article
Devices
  • Artix-7
Tools
  • ISE Design Suite - 14.3