Multicycle paths are valid functional paths that intentionally require more than one clock cycle to propagate data from the launch register to the capture register.
The is not merely a manual; it is a methodology textbook. It teaches that constraints are specifications, optimizations are negotiations, and timing closure is a verification process.
Before trusting your timing reports, run sanity checks to find unconstrained registers or conflicting exceptions.
: Methods for specifying set_input_delay and set_output_delay to model external interface requirements. synopsys timing constraints and optimization user guide 2021
report_timing -delay_type max : Generates the detailed path calculation for your worst setup violations.
: Overview of technology-independent, mapping, and technology-specific optimization. Optimizing for Delay and Area : Strategies for balancing PPA (Power, Performance, Area). Sequential Optimization
Specifying how much time the external world needs after a clock edge to capture data. Before trusting your timing reports, run sanity checks
Input delay specifies the time elapsed between an external clock edge and the arrival of data at the chip's input port.
: Ensures data arrives at the destination register before the capturing clock edge. Violations are fixed by reducing combinational delay.
To prevent the optimization engine from over-restructuring logic that requires precise physical placement, use preservation commands. and power. Workflow Integration
To define timing constraints, you need to use a constraints file, which is a text file that contains a set of commands that specify the timing requirements of the design. The constraints file is used by Synopsys tools to analyze and optimize the design.
Synopsys engines optimize designs based on a weighted priority queue called the cost function. By default, the optimization priorities are ranked as follows:
to make critical trade-offs between timing, area, and power. Workflow Integration