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AR# 3139

dc2ncf: ERROR [#154]: Invalid argument -max for set_input_delay constraint at line x

Description

Keywords: dc2ncf, -max, set_input_delay, set_output_delay.

Urgency: Standard

General Description: When usind dc2ncf, this error is
generated:

ERROR [#154]: Invalid argument -max for set_input_delay constraint at line x

Dc2ncf will generate a ncf file that does not contain the
timing contraint specified at line x.

Solution

Dc2nf does not support the -max argument specified by Synposys
timing constraints. Simply remove the -max argument from the
timing constraints and run dc2ncf again.

This problem only exists in M1.3. In M1.4. Dc2ncf will ignore
the -max argument but write out the ncf file with the timing constraint specified at line x. The -max option for set_input_delay/set_output_delay
is not supported in M1.3 and M1.4. Currently, Xilinx only supports
worst-case delays.

For more information about Synopsys timing constraints that are
supported by dc2ncf, please refer to Section: Creating Timing
Constraints, Chapter: 3, of the Synopsys XSI Interface/Tutorial
Guide.
AR# 3139
Date Created 08/31/2007
Last Updated 10/06/2008
Status Archive
Type General Article