What is this doing? I am trying to get my head round the point of this.
Vivado "help create_fileset" says the following
A fileset is a list of files with a specific function within the project.
One or more constraint files is a constraint set (-constrset); one or more
simulation test benches is a simulation set (-simset). Only one fileset
option can be specified when using the create_fileset command. As a
default, the tool will create a constraint fileset if the type is not
specified."
The fileset is just a list of all the files of a particular type like a source_1 fileset would have the file names of all your sources VHDL/Verilog. This allows the tools to find all the files for a design without having to explicitly call them out on a command line.
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Oh, yeah and a blockset I believe is for the block diagram tool.