The first two parts list the author and file name. The “Design units” part provides a brief description about the design units in the file. The description includes the input and output ports and the function of the entity, and the implementation method of the architecture body.
The final “Revision history” part provides general information about the development. The "Library/package” and “Synthesis and verification” parts describe the design environment. The idea here is to provide the necessary information for users to reconstruct or duplicate the implementation. The “Library/package” part lists the packages and libraries that are referred to in the design file, and explains briefly the use of these packages. It is especially essential
when a nonstandard or custom package is involved. The “Synthesis and verification” part lists the EDA software and the script or relevant options used in the synthesis, the original targeting device technology, as well as, if available, the testbench used to verify the design.
Since synthesis software from different manufacturers supports different subsets of the VHDL and may interpret certain VHDL constructs differently, this information allows future users to duplicate the original implementation
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