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It's recommended to use Xilinx Documentation Navigator (DocNav) to get access to all documentation of Xilinx with "Up to Date Catalog" of DocNav. Documents can be found easy by "DOC ID" via search function of the catalog view. Search documents on Web is also possible, but ensure to use the appropriate document version to your installed Xilinx software.
https://xilinx-wiki.atlassian.net/wiki/spaces/A/overview
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