Once inside DC, the next step is to read your RTL files. You can read them with the read_verilog command (or read_vhdl for VHDL). It is recommended to use read_verilog for single modules and analyze & elaborate for VHDL designs.
By using compile_ultra in topographical mode (or simply using DC-G's default flow), you provide a floorplan to DC. The tool then performs "virtual routing" to estimate net delays far more accurately. This results in a netlist with timing and area within ~5% of the final placed design, significantly reducing iterations between synthesis and layout.
Enable compile_ultra , rewrite long logic paths into smaller pipeline stages, or ease clock constraints.
# Standard structural compilation compile -map_effort medium # High-performance compilation (Requires compile_ultra license) # compile_ultra -gate_clock Use code with caution. Step 5: Analyzing Reports synopsys design compiler tutorial 2021
Contains the actual cells (AND, OR, Flip-Flops) that the tool uses to map the design. These files usually have a .db extension.
# Define directory paths set Tool_Dir "/tools/synopsys/DC_2021/" set Lib_Dir "/home/user/designs/pdk/faraday_90nm/libs/" set Design_Dir "/home/user/designs/my_project/src/" # Configure Search Paths set search_path [concat $search_path $Lib_Dir $Design_Dir] # Define Technology Libraries set target_library [list "fsa0m_a_generic_core_ss.db"] set link_library [list * "fsa0m_a_generic_core_ss.db" "ram_256x16_ss.db"] set symbol_library [list "fsa0m_a_generic_core.sdb"] # Define Working Directories define_design_lib WORK -path ./WORK puts "--- Environment Setup Complete ---" Use code with caution. 3. Reading and Elaborating the Design
Do you need to include specialized blocks like or Clock Gating cells? Share public link Once inside DC, the next step is to read your RTL files
: Contains the visual representations of logic gates used for schematic generation in the Graphical User Interface (Design Vision). Example .synopsys_dc.setup Script
# Analyze SystemVerilog files analyze -format sverilog top_module.sv controller.sv datapath.sv # Elaborate the top-level design module elaborate top_module Use code with caution. Method B: Read File
Applies logic minimization, restructuring, and technology mapping based on user constraints. By using compile_ultra in topographical mode (or simply
The timing report lists the path with the worst Slack. Slack is the difference between the required time for data to arrive and the actual time it took to arrive.
set_max_area 0 ;# Tells DC to make the design as small as possible set_load 0.5 [all_outputs] Use code with caution. 5. Running Compilation
# Define target and synthetic libraries set target_library [list /path/to/tsmc_45nm_generic_core_tt_1v0_25c.db] set synthetic_library [list dw_foundation.sldb] set link_library [list * $target_library $synthetic_library] # Define search paths for source files and libraries set search_path [list . ./src ./libs $search_path] # Define directory for structural organization set compile_directory_by_name "true" # Define alias for ease of use alias h history alias rc "report_constraint -all_violators" Use code with caution. 3. Reading and Elaborating the RTL