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AR# 6416

2.1i FPGA Editor - ERROR:FPGAEditor:285 - Cannot alter a global period constraint via a new attribute.

Description

Keywords: constraints, phyical, FPGA Editor

Urgency: Standard

General Description:
I am adding a Physical Constraint to a net (under "Attrib"); I put a max delay, then select "Apply". After the a global period constraint is applied to the design, the following error occurs:

ERROR:FPGAEditor:285 - Cannot alter a global period constraint via a new attribute.

解决方案

The error can be ignored, as the constraint does get defined for the net. Normally, in the absense of the a global constraint, this would not cause any problem. However, since there is a global constraint, an error is issued.

To work around this error, either simply ignore it, or use the command line in the GUI to apply the same constraint.

An example of the GUI command line:

setattr net FASTCLK period 12:high:6

The syntax is as follows:

setattr net net_name period <period_value>
[:<low|high>:<duration>][:<tsid>:<phase>:<factor>]
AR# 6416
创建日期 05/07/1999
Last Updated 07/09/2001
状态 Archive
Type 综合文章