The "Synopsys Timing Constraints and Optimization User Guide" is a definitive manual for digital IC designers. This guide covers the core principles and practical applications of timing constraints in the Synopsys tool flow, which typically includes Design Compiler for synthesis, IC Compiler for physical design, and PrimeTime for static timing analysis (STA) sign-off. The 2021 edition addresses methodologies for writing and managing Synopsys Design Constraints (SDC) files and optimizing designs to meet performance specifications.
provides a comprehensive framework for defining design intent through Synopsys Design Constraints (SDC)
set_clock_groups -asynchronous -group CLK_CORE -group CLK_USB, CLK_PCIE Use code with caution. 5. Optimization Methodologies in Design Compiler synopsys timing constraints and optimization user guide 2021
-max : Used for setup analysis (tells the tool how late data can arrive).
Correctly constraining paths that take more than one clock cycle to resolve. Correctly constraining paths that take more than one
Before diving into constraints, the 2021 guide thoroughly explains the fundamentals of Static Timing Analysis (STA). Unlike dynamic simulation, which applies vectors to verify functionality, STA is a method that verifies design timing by checking all possible timing paths under worst-case conditions.
Restricts the maximum time allowed for a signal edge to transition from low to high or high to low. Slow transitions cause massive internal dynamic power dissipation and unpredictable delays. If certain paths are never active
Inserting buffers into long, resistive interconnect lines to split wire capacitance and restore signal integrity.
If certain paths are never active, explicitly define them to prevent false violations.