AR# 39650

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Design Assistant for XST - Help applying constraints with an XCF

描述

Please refer to this answer record for help applying constraints within an XCF.

Note: This Answer Record is a part of the Xilinx Solution Center for XST (Xilinx Answer 38927). The Xilinx Solution Center for XST is available to address all questions related to XST. Whether you are starting a new design or troubleshooting a problem, use the Solution Center for XST to guide you to the right information.

解决方案

Some XST constraints can be applied not only globally but also specifically to certain modules, instances or signals in the XST Constraint File (XCF). Most XST constraints that can be applied in RTL code can also be applied in XCF. Applying constraints in the XCF makes the HDL source code more portable and reusable.


Following are some examples of applying XST constraints in XCF.


BEGIN MODEL "top"
NET "signal1" fsm_style = lut;
END;


MODEL "top" keep_hierarchy = yes;


BEGIN MODEL "top"
INST"submodule1"shift_extract = no;
END;


For more information about any constraints syntax in XCF, please refer toUG627/687-XST User Guide (Xilinx Answer 38931).

链接问答记录

主要问答记录

Answer Number 问答标题 问题版本 已解决问题的版本
38927 面向 XST 的 Xilinx 解决方案中心 N/A N/A

相关答复记录

Answer Number 问答标题 问题版本 已解决问题的版本
39749 Design Assistant for XST - Help with XST Options/Constraints/Attributes N/A N/A
AR# 39650
日期 01/25/2013
状态 Active
Type 综合文章
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