The design flow for repeating
phys_opt_design design changes is shown in the following figure.
Figure 1. Design Flow when Repeating phys_opt_design Changes
This flow differs from the retrofit flow in two aspects:
iphys_opt_designchanges are incorporated after
place_designinstead of beforehand.
- Both placement changes as well as netlist changes are captured
Typically, you would use this flow to gain more control over the
phys_opt_design step. Custom "recipes"
are created from combinations of replayed optimizations and new optimizations
resulting in many possibilities for exploration of design closure.
read_iphys_opt_tcl commands have a
-place option to replay the placement changes from
phys_opt_design. This option should be used in
this flow to repeat
phys_opt_design steps after