Synopsys Timing — Constraints And Optimization User Guide 2021

: Modifying the default single-cycle relationship for specific logic using set_multicycle_path Max/Min Delays : Overriding default constraints on specific paths with set_max_delay set_min_delay 5. Design Rule Constraints (DRC) Maximum Fanout : Setting limits on the number of loads for a driver. Maximum Capacitance : Limiting the total capacitive load on a net. Maximum Transition

The Synopsys Timing Constraints and Optimization User Guide 2021 provides a detailed overview of the company's timing analysis and optimization capabilities. This guide is designed for digital designers, verification engineers, and design managers working with Synopsys' EDA tools. The guide covers the following topics:

Design Compiler in 2021 continues to integrate advanced algorithms to balance area and power without sacrificing timing. Strategies for Optimization

: Completing port constraints with drive strength and load information. 4. Timing Exceptions False Paths synopsys timing constraints and optimization user guide 2021

A chip does not operate in isolation. You must tell the Synopsys timing engine what happens outside the chip's boundaries to accurately synthesize peripheral interfaces.

# Allow 3 clock cycles for data setup along a multiplier path set_multicycle_path 3 -setup -from [get_pins mult_reg*/CP] -to [get_pins accum_reg*/D] # Adjust the corresponding hold check to happen 1 cycle after the launch edge set_multicycle_path 2 -hold -from [get_pins mult_reg*/CP] -to [get_pins accum_reg*/D] Use code with caution. 5. Design Optimization Strategies

If the logic depth is too high for the target frequency, you must modify your original RTL code to implement manual pipelining. Converts logic into a sum-of-products format

The chip does not exist in isolation; it interfaces with external components. The guide dedicates significant space to input and output constraints:

Allowing the tool to optimize across module boundaries.

Converts logic into a sum-of-products format, removing intermediate structures to maximize speed at the expense of area. 6. Environmental and Physical Constraints synopsys timing constraints and optimization user guide 2021

: Register clock pin to the data pin of the next sequential element. Reg2Out : Register clock pin to an output port.

Based on the 2021-era documentation and standard Synopsys technical manuals, here is a typical table of contents for this guide: 1. Introduction to Timing Constraints Basic Concepts

The 2021 Synopsys Timing Constraints and Optimization guide, utilized within Design Compiler and Fusion Compiler, provides a comprehensive framework for SDC management and design optimization from RTL to signoff

: Identifying paths that do not need to meet timing (e.g., static signals, asynchronous crossings) using set_false_path Multicycle Paths