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AR# 63850

2014.3 Partial Reconfiguration - The initial configuration does not analyze the paths that are analyzed in the second configuration, which cause the timing violation

Description

In my Partial Reconfiguration design, there are no timing violations in the initial configuration.

But in the second configuration, some timing violations occur on the interface paths, which are not analyzed in the initial configuration.  

Solution

This can occur when the loads of the static logic in the Reconfigurable Module (RM) are constant during the initial configuration, so the paths from static logic to constant in RM are not analyzed.
 
Because they are not analyzed in the initial configuration, the placement/routing of these paths is very poor and the static region uses too much of the interface budget.
 
When they are analyzed in the second configuration, all placement/routing is locked, and there is nothing the tools can do to fix the failing paths.
 
This issue is fixed in Vivado 2015.1.
 
 
AR# 63850
Date Created 03/10/2015
Last Updated 03/23/2015
Status Active
Type General Article
Tools
  • Vivado Design Suite - 2014.3