load iPhysOpt script and run it.
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] [‑auto_pipeline] [‑critical_pin_opt]
[‑equ_drivers_opt] [‑include_skipped_optimizations]
[‑insert_negative_edge_ffs] [‑hold_fix] [‑slr_crossing_opt] [‑quiet]
[‑verbose] [<input>]Usage
| Name | Description |
|---|---|
[-fanout_opt]
|
Fanout optimization including very high fanout optimizations |
[-critical_cell_opt]
|
Do cell-duplication based optimization on timing critical nets |
[-placement_opt]
|
Move cells to reduce delay on timing-critical nets |
[-rewire]
|
Do rewiring optimization |
[-dsp_register_opt]
|
DSP register optimization |
[-bram_register_opt]
|
BRAM register optimization |
[-uram_register_opt]
|
UltraRAM register optimization |
[-shift_register_opt]
|
Shift register optimization |
[-auto_pipeline]
|
Auto pipeline |
[-critical_pin_opt]
|
Pin Swap optimization |
[-equ_drivers_opt]
|
Equivalent driver rewiring |
[-include_skipped_optimizations]
|
Apply undo changes |
[-insert_negative_edge_ffs]
|
Inserting negative edge triggered FFs for high hold mitigation |
[-hold_fix]
|
Inserting buffers for hold fix optimization |
[-slr_crossing_opt]
|
Optimize slr crossing nets |
[-quiet]
|
Ignore command errors |
[-verbose]
|
Suspend message limits during command execution |
[<input>]
|
iPhysOpt.tcl file |
Categories
Description
- Applying post-placement physical optimizations to the pre-placement netlist to improve the overall placement result and improve design performance.
- Saving the physical optimizations in a Tcl script to be repeated as needed.
To apply post-placement optimizations to the pre-placement netlist, you can reset the implementation run and open the synthesized design, or open the opt_design checkpoint, and read the iphys_opt Tcl script to apply the physical optimizations.
You can apply all optimizations from the iphys_opt Tcl script, or apply specific optimizations using the options of the read_iphys_opt_tcl command. You can also include any optimizations that were defined but skipped during physical optimization.
If the iphys_opt Tcl script includes placement data, you can use that data to place the optimized cells in the design.
After reading the iphys_opt Tcl script, and placing the optimized cells, you can rerun placement for the overall design. The design now incorporates the benefits of the phys_opt_design optimizations before placement, such as fewer high-fanout nets due to replication, and fewer long distance paths from block RAM outputs. The results should be a better placement, and improved design performance, due to the early application of netlist optimizations.
This command returns a transcript of its processes, or returns an error if it fails.
Arguments
-fanout_opt - (Optional) Apply the fanout optimizations that are defined in the specified interactive physical optimization Tcl script.
-critical_cell_opt - (Optional) Applies the cell replication optimizations that are defined in the specified Tcl script.
-placement_opt - (Optional) Applies the cell placement optimizations that are defined in the specified Tcl script.
-rewire - (Optional) Applies the logic cone refactoring that are defined in the specified Tcl script.
-dsp_register_opt - (Optional) Applies the DSP optimizations that are defined in the specified interactive physical optimization Tcl script.
-bram_register_opt - (Optional) Applies the BRAM optimizations that are defined in the specified Tcl script.
-shift_register_opt - (Optional) Applies the shift register optimization that are defined in the specified Tcl script.
-critical_pin_opt - Applies the pin-swapping that are defined in the specified Tcl script.
-include_skipped_optimizations - (Optional) 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.
-quiet - (Optional) Execute the command quietly, returning no messages from the command. The command also returns TCL_OK regardless of any errors encountered during execution.
-verbose - (Optional) Temporarily override any message limits and return all messages from this command.
set_msg_config command.Examples
open_checkpoint C:/Data/opt_design.dcp
read_iphys_opt_tcl -shift_register_opt -placement_opt C:/Data/my_iphys_opt.tcl