Maxim Integrated Fresno (MAXREFDES11) Nexys 3 - Manual (Page 9)

Fresno (MAXREFDES11#) Nexys 3 Quick Start Guide
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7. If the Project Explorer does not contain these three subfolders, launch the
File | Import menu, expand the General folder, and select Existing Projects
into Workspace. Click Next. Set the root directory to:
C:\designs\maxim\RD11V01_00\RD11_NEXYS3_V01_00\Design_Files\sdkWorkspace
and the missing projects should appear in SDK Project Explorer with their
checkboxes checked.
Click Finish to import the projects.