AR# 40209

Map - "ERROR:Pack:2811 - Directed packing was unable to obey the user design constraints..."

Description

I see the following pack error when using Synopsys synthesis tools:

"ERROR:Pack:2811 - Directed packing was unable to obey the user design constraints (BLKNM=1) which requires the combination of the symbols listed below to be packed into a single SLICE component. The directed pack was not possible because: There are more than eight registers."

Solution

This error might be caused by the existence of 'COMP' property in the EDIF netlist. The COMP property conflicts with an obsolete XILINX pack constraint that is still converted to BLKNM constraints. Beginning with ISE 13.2, the COMP properties will be ignored by the ISE implementation tools. Meanwhile, the problem can be avoided by removing the properties from the EDIF file using a text editor.

(property COMP (integer 0))
(property COMP (integer 1))
(property COMP (integer 2))

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AR# 40209
Date	05/19/2012
Status	Active
Type	Error Message
Tools	ISE Design Suite - 11.1 ISE Design Suite - 11.2 ISE Design Suite - 11.3 More ISE Design Suite - 11.4 ISE Design Suite - 11.5 ISE Design Suite - 12.1 ISE Design Suite - 12.2 ISE Design Suite - 12.3 ISE Design Suite - 12.4 ISE Design Suite - 13 Less

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