Run Section - 2024.2 English

The Run section of the ECO Navigator, shown in the figure below, provides access to all the commands required to implement the current changes.

Figure 1. ECO Navigator Run Commands

Check ECO

Runs the ECO checks rule deck on the current design.

Tip: The Vivado tools allow you to make netlist changes unconditionally using the ECO commands. However, logical changes can lead to invalid physical implementation. Run the Check ECO function to flag any invalid netlist changes or new physical restrictions that need to be addressed before physical implementation can commence.

Optimize Logical Design

In some cases, it is desirable to run opt_design on the modified design to optimize the netlist. This command opens the Optimize Logical Design dialog box, allowing you to specify options for the opt_design command. Any options that are entered in the dialog box are appended to the opt_design command as they are typed. For example, to run opt_design -sweep, type -sweep under Options.

Figure 2. Optimize Logical Design Dialog Box

Place Design

For 7 series and UltraScale families, runs incremental place_design on the modified netlist as long as 75% or more of the placement can be reused. The Incremental Placement Summary at the end of place_design provides statistics on incremental reuse. Selecting this command opens the Place Design dialog box and allows you to specify options for the place_design command. Any options that are entered in the dialog box are appended to the place_design command as they are typed.

Refer to Incremental Implementation for additional information on Incremental Place and Route.

For Versal, the standard place_design is invoked. It places the unplaced or newly added cells. The scope of the flow is limited to <1000 new cells and the following restrictions should be observed:

• The ECO edits should not lead to any illegal site solution. Run Check ECO before calling ECO placer or report_drc with the eco_checks ruledeck using the following command: report_drc -name drc_1 -ruledecks {eco_checks}
• The ECO edits should not lead to changes in the clock solution.
• There should be no modifications to SLR crossings.
• It is not timing driven.

To enable the ECO placer flow, in the Place Design Dialog Box, add options -eco -no_timing_driven as shown below. The Tcl command to invoke ECO placer is as follows: place_design -eco -no_timing_driven

Figure 3. Place Design Dialog Box

Optimize Physical Design

In some cases it is desirable to run phys_opt_design on the modified design to perform physical optimization on the netlist. This command opens the Optimize Physical Design dialog box and allows you to specify options for the phys_opt_design command. Any options that are entered in the dialog box are appended to the phys_opt_design command as they are typed. For example, to run phys_opt_design -fanout_opt, type -fanout_opt under Options.

Figure 4. Optimize Physical Design Dialog Box

Route Design

Selecting this command opens the Route Design dialog box. Depending on the selection, this command allows you to perform an Incremental Route of the modifications made to the design, Route the selected pin, or Route selected nets. If Incremental Route is selected on a modified netlist that has less than 75% of reused nets, the tool reverts to the non-incremental route_design.

Figure 5. Route Design Dialog Box

Refer to Incremental Implementation for additional information on Iincremental Place and Route.

Depending on your selection, you have four options to route the ECO changes:

Incremental Route

This is the default option.

Route selected pin

This option limits the route operation to the selected pin.

Route selected non-Power nets

This option routes only the selected signal nets.

Route selected Power nets

This option routes only the selected VCC/GND nets.