The interactive physical optimization commands, along with corresponding options, are described below.
write_iphys_opt_tcl
This command writes a file containing the iphys_opt_design Tcl
commands corresponding to the physical optimizations performed in the current
design.
Syntax:
write_iphys_opt_tcl [-place] [-quiet] [-verbose] <output file>The -place option directs the command to include placement information with the
iphys_opt_tcl commands. Use this option when you intend to
apply placement with netlist changes during iphys_opt_design
command replay.
The write_iphys_opt_tcl command can be used any time after
phys_opt_design has been run.
read_iphys_opt_tcl
This command reads a file containing the iphys_opt_design Tcl
commands corresponding to the physical optimizations performed in a previous
run.
Syntax:
read_iphys_opt_tcl [-fanout_opt] [-critical_cell_opt] [-placement_opt] [-rewire] [-dsp_register_opt] [-bram_register_opt]
[-uram_register_opt][-shift_register_opt] [-critical_pin_opt] [-insert_negative_edge_ffs] [-slr_crossing_opt]
[-include_skipped_optimizations] [-quiet] [-verbose] <input file>
The read_iphys_opt_design command has many of the same options as
phys_opt_design to limit the scope of replayed optimizations to
only those specified. These options include -fanout_opt,
-critical_cell_opt, -placement_opt,
-rewire, -dsp_register_opt,
-bram_register_opt, -uram_register_opt,
-shift_register_opt,
-insert_negative_edge_ffs, -slr_crossing_opt, and
-critical_pin_opt.
Apply the skipped optimizations that are defined in the input Tcl script, as well as
the standard optimizations. These are optimizations identified by
phys_opt_design that are skipped because suitable locations for
optimized logic cannot be found. When this option is specified, the
iphys_opt_design command will attempt to use the included
skipped optimizations in the pre-placement netlist.
iphys_opt_design
The iphys_opt_design command is a low-level Tcl command that
performs a physical optimization. All default phys_opt_design
optimizations can be performed using iphys_opt_design. Although it
is possible to modify iphys_opt_design commands, and even to create
them from scratch, you would typically write them to a script and replay them in a
separate run.
iphys_opt_design commands. For most efficient processing of
commands and for fastest runtime, use the read_iphys_opt_tcl
command instead.Syntax
iphys_opt_design [-fanout_opt] [-critical_cell_opt] [-placement_opt] [-rewire] [-net <arg>] -cluster <args> -place_cell <args> [-place]
[-dsp_register_opt] [-bram_register_opt] [-uram_register_opt] [-shift_register_opt] [-slr_crossing_opt] [-cell <arg>]
[-packing][-unpacking][-port <arg>] [-critical_pin_opt] [-skipped_optimization][-insert_negative_edge_ffs]
[-quiet] [-verbose]