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# Prevent Design Compiler from optimizing away a crucial module set_dont_touch [get_cells u_sensitive_macro] # Prevent the tool from altering a custom buffer chain set_dont_touch [get_nets clk_gate_net] Use code with caution. 6. Verification and Troubleshooting
Setting robust constraints is the first step in avoiding silicon failure. The guide outlines a hierarchical approach to defining the design's environment:
The 2021 documentation introduced enhanced support for advanced process nodes (7nm and below) where parasitic effects are dominant. synopsys timing constraints and optimization user guide 2021
In the realm of digital design, timing analysis and optimization play a crucial role in ensuring that integrated circuits (ICs) meet the required performance, power, and area (PPA) metrics. Synopsys, a leading provider of electronic design automation (EDA) solutions, offers a comprehensive suite of tools and methodologies for timing analysis and optimization. This article provides an in-depth guide to Synopsys' timing constraints and optimization capabilities, focusing on the 2021 user guide.
Max transition, max capacitance, max fanout.
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The bedrock of Synopsys timing closure is the Synopsys Design Constraints (SDC) language. Written in a Tcl-based syntax, SDC communicates your design's physical and electrical intent directly to synthesis, placement, and routing engines. The Timing Engine's Perspective
Precise clock definition is crucial. Use create_generated_clock to model phase-locked loops (PLLs) and dividers to allow the tool to track latency properly.
: Register clock pin to the data pin of the next sequential element. Reg2Out : Register clock pin to an output port. The guide outlines a hierarchical approach to defining
Typically the data pin of a destination register or an output port.
During pre-layout synthesis (Design Compiler), clocks are modeled as , meaning they distribute to all registers with zero delay. During post-layout implementation (IC Compiler II), after the clock tree is physically built, clocks are switched to propagated to calculate actual network delays.
Synthesis is the process of converting RTL code into a technology-mapped gate-level netlist while aggressively optimizing for .
: Newer versions emphasize a "four-step" or "sign-off" approach to verify and manage constraints early in the design cycle to prevent silicon failure. Troubleshooting Depth