Sawen_Blog

1. Synthesis Options#

1. Optimization Level (-O or --optimize)

   • 0: Default optimization, reduces compilation time.
   • 1: Reduces power consumption (runs Power_DefaultOpt strategy).
   • 2: Increases kernel speed (adds PHYS_OPT_DESIGN step).
   • 3: Maximum performance (enables retiming and physical optimization).
   • s: Reduces logic resources (runs Area_Explore strategy).
   • quick: Shortens implementation time (enables Flow_RuntimeOptimized).

2. Synthesis Strategy (vivado.synth_strategy)

   • Includes default strategy (Synthesis_Defaults), quick runtime optimization (Flow_RuntimeOptimized), and custom strategies.

3. RTL Language Selection (vivado.rtl)

   • Specify as verilog or vhdl.

4. Hierarchy Management (-flatten_hierarchy)

   • Options: none (maintain hierarchy), full (fully flatten), rebuilt (rebuild hierarchy afterwards).

5. Resource Control

   • Gated clock conversion (-gated_clock_conversion)
   • BUFG count limit (-bufg)
   • Resource sharing (-resource_sharing).

6. Report Level (vivado.report_level)

   • 0: Utilization after synthesis + timing after implementation.
   • 1: Detailed analysis after synthesis/implementation.
   • 2 (default): Includes quick failure checks.

2. Implementation Options#

1. Implementation Strategy (--vivado.impl.strategies)

   • Predefined strategies such as performance priority (Performance_Explore), resource optimization (Area_Explore), or custom strategies.

2. Number of Parallel Jobs (--vivado.impl.jobs)

   • Specify the number of parallel processes for Vivado implementation (e.g., --vivado.impl.jobs 4).

3. Physical Optimization (vivado.phys_opt)

   • Stage selection: none, place (placement optimization), route (routing optimization), or all.

4. Timing Control

   • Maximum number of timing paths (vivado.max_timing_paths): Specify the number of paths reported when timing is not met.

5. Pblock Range (vivado.pblock)

   • Specify the logic area of interest during implementation (e.g., {SLICE_X8Y105:SLICE_X23Y149}).

6. Resource Optimization

   • The --optimize parameter can affect resource usage (e.g., the s option reduces resource consumption).

3. Other Key Options#

• Disable IP Cache (--no_ip_cache): Forces the tool to regenerate IP synthesis results.
• Custom Synthesis Command (vivado.synth_design_args): Pass additional parameters to synth_design.
• Physical Layout Control: Distribute implementation tasks via LSF cluster (--vivado.impl.lsf).

Note: Some options need to be configured through the Vitis toolchain (v++ command), while others can be adjusted through the Vivado GUI's "Project Settings" (such as synthesis strategy, implementation strategy, and number of parallel jobs). For detailed strategies, please refer to the "Vivado Design Suite User Guide".

No time to write more, just using the generated content for now.