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AR# 33520 11.3 Spartan-6 Place - ERROR:Place:543 for design that should fit

Description


My design fails with the following error which indicates that the design does not fit. The design is not area constrained and should have no problem fitting into the target device. What could be the problem?



ERROR:Place:543 - This design does not fit into the number of slices available

in this device due to the complexity of the design and/or constraints.



Unplaced instances by type:



FF 2 (0.0%)

LUT 2 (0.0%)

LUTL 4 (0.1%)



Please evaluate the following:



- If there are user-defined constraints or area groups:

Please look at the "User-defined constraints" section below to determine

what constraints might be impacting the fitting of this design.

Evaluate if they can be moved, removed or resized to allow for fitting.

Verify that they do not overlap or conflict with clock region restrictions.

See the clock region reports in the MAP log file (*map) for more details

on clock region usage.



- If there is difficulty in placing LUTs:

Try using the MAP LUT Combining Option (map lc area|auto|off).



- If there is difficulty in placing FFs:

Evaluate the number and configuration of the control sets in your design.



The following instances are the last set of instances that failed to place:



0. Placer RPM "BelCluster" (size: 8)

...

Solution


There is a known problem that can trigger this error on designs that should fit. Scan the message text and look for the string "BelCluster". If this string is found, it may be possible to work around the failure by setting the environment variable below.



NOTE: This Answer Record is only a good match for your case if the string "BelCluster" is in the error message body. Place:545 errors are fitting errors that can occur for a variety of reasons that are unrelated to this Answer Record.



Linux

setenv XIL_PAR_NO_STAGE2_CLS 1



Windows

SET XIL_PAR_NO_STAGE2_CLS=1



For general information about setting ISE environment variables, see (Xilinx Answer 11630).

Actions

AR# 33520
Date Created 09/16/2009
Last Updated 09/09/2010
Status Active
Type
Devices
  • Spartan-6 LX
  • Spartan-6 LXT
Tools
  • ISE Design Suite - 11.3
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