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AR# 64135

2015.1 Partial Reconfiguration - Too many clocks are found in the second configuration

Description

This issue occurs in the second configuration in a PR design, where the static logic is locked, and all RM clocks should already be assigned from the initial configuration.
 
It should be impossible for the clock assignments to change.
 
However, during place_design, I receive the following error message:
 

ERROR: [Place 30-410] Global clock placer placed 13 clocks into clock region X0Y5, and each clock region can only have 12 clocks.
An attempt to move the required 1 clocks into other clock regions failed.
This could be due to the following reasons:
1. The other clock regions have too many clocks. See below for the number of clocks in each of the clock regions:
Clock Region X0Y0 has 6 clocks: (6 non-RM and 0 RM clocks)
Clock Region X1Y0 has 8 clocks: (8 non-RM and 0 RM clocks)
Clock Region X0Y1 has 8 clocks: (8 non-RM and 0 RM clocks)
Clock Region X1Y1 has 7 clocks: (7 non-RM and 0 RM clocks)
Clock Region X0Y2 has 6 clocks: (6 non-RM and 0 RM clocks)
Clock Region X1Y2 has 9 clocks: (9 non-RM and 0 RM clocks)
Clock Region X0Y3 has 10 clocks: (6 non-RM and 4 RM clocks)
Clock Region X1Y3 has 6 clocks: (2 non-RM and 4 RM clocks)
Clock Region X0Y4 has 12 clocks: (8 non-RM and 4 RM clocks)
Clock Region X1Y4 has 8 clocks: (0 non-RM and 8 RM clocks)
Clock Region X1Y5 has 8 clocks: (4 non-RM and 4 RM clocks)
Clock Region X0Y6 has 10 clocks: (10 non-RM and 0 RM clocks)
Clock Region X1Y6 has 8 clocks: (8 non-RM and 0 RM clocks)
2. There may not be sufficient capacity in the other clock regions to place the instances in the clock nets.
3. The contents of the clock nets are already constrained by regional clock placer and cannot be moved.
Please see below for the contents of each clock in this clock region.

Solution

This is a false error message and the issue is fixed in Vivado 2015.2.
AR# 64135
Date Created 04/01/2015
Last Updated 04/30/2015
Status Active
Type General Article
Devices
  • Kintex-7
  • Virtex-7
Tools
  • Vivado Design Suite - 2015.1