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] [-replicate_cell]
[-placement_opt] [ -restruct_opt] [-forward_retime]
[-backward_retime] [-dsp_register_opt]
[-bram_register_opt]
[-uram_register_opt] [-shift_register_opt]
[-shift_register_to_pipeline] [-auto_pipeline]
[-pipeline_to_shift_register] [-critical_pin_opt]
[-restruct_opt] [-equ_drivers_opt]
[-include_skipped_optimizations] [-create_bufg]
[-insert_negative_edge_ffs] [-hold_fix]
[-slr_crossing_opt] [-quiet]
[-verbose] [<input>]
read_iphys_opt_tcl
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
-
-restruct_opt
-
-dsp_register_opt
-
-bram_register_opt
-
-uram_register_opt
-
-shift_register_opt
-
-insert_negative_edge_ffs
-
-slr_crossing_opt
-
-critical_pin_opt
-
-replicate_cell
-
-forward_retime
-
-backward_retime
-
-shift_register_to_pipeline
-
-auto_pipeline
-
-pipeline_to_shift_register
-
-restruct_opt-equ_drivers_opt
-
-create_bufg
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] [-replicate_cell]
[-reconnect] [-placement_opt] [-forward_retime]
[-backward_retime] [-net <arg>] -cluster <args>
-place_cell <args> [-dsp_register_opt] [-bram_register_opt]
[-uram_register_opt] [-shift_register_opt] [-cell <arg>]
[-packing] [-unpacking] [-port <arg>] [-critical_pin_opt]
[-restruct_opt] [-equ_drivers_opt] [-skipped_optimization]
[-create_bufg] [-insert_negative_edge_ffs] [-hold_fix]
[-slr_crossing_opt] [-shift_register_to_pipeline]
[-auto_pipeline] [-pipeline_to_shift_register] [-quiet]
[-verbose]