Fig.~\ref{fig:vgen} gives an outline of the VGEN flow, which operates in two stages.
The first step is to update a CSR database with signals from the design, which can be done periodically as the RTL is developed.
The VGEN tool automatically updates the database (\texttt{vgen -update}) by parsing RTL modules to find signal names with a matching prefix or postfix that indicates a CSR should be attached to the signal.
