4.1 Duplicate Block Definition
If you import two versions of your block file, you must choose which one you want to use. For example:
- Import 
top.vandblock1.vfiles as HDL (File > Import HDL Source Files) into the top-level project. - Import 
<block1>(File > Import > Blocks). 
Libero recognizes a duplicate definition of <block1>; one from the HDL and another in the imported block file. The Design Hierarchy tab shows a <block1>.cxf  and <block1>.v file under Duplicate Modules; Libero uses the HDL <block1> by default.
To override the default behavior and select the block definition, right click the
                <block1>.cxf file and choose Use This
                File. When you update the behavior, the block icon appears in the
                Design Hierarchy.
