In both Project Mode and Non-Project Mode, incremental implementation mode
is entered when you load the reference design checkpoint using the read_checkpoint -incremental <dcp_file>
command where
<dcp_file> specifies the path and file name of the reference design checkpoint.
Loading the reference design checkpoint with the -incremental option enables the
Incremental Compile design flow for subsequent place and route operations. In
Non-Project Mode, read_checkpoint -incremental
should
follow opt_design
and precede place_design
.