Synopsys Timing Constraints And Optimization User Guide 2021 |verified| Info

To prevent the optimization engine from over-restructuring logic that requires precise physical placement, use preservation commands.

This guide breaks down the core concepts, syntax, and strategies outlined in the Synopsys Timing Constraints and Optimization User Guide to help you achieve optimal Power, Performance, and Area (PPA). 1. Core Principles of Static Timing Analysis (STA)

: Inclusion of ML-based power recovery and Path-Based Analysis (PBA) to squeeze extra performance and power savings from the design. Multibit Optimization

set_false_path -from [get_clocks CLK_A] -to [get_clocks CLK_B] set_false_path -through [get_pins test_mode_reg/Q] Use code with caution. Multicycle Paths

Clocks are the heartbeat of any synchronous digital system. Accurately defining them is the most critical step in creating a valid constraint file. Primary Clock Definitions synopsys timing constraints and optimization user guide 2021

Inserting buffers into long, resistive interconnect lines to split wire capacitance and restore signal integrity.

Are you primarily focusing on or sign-off timing (PrimeTime) ?

. While the exact chapter numbering can vary slightly between tool releases (e.g., version R-2020.09 vs. S-2021.06), the core content structure remains consistent.

Designs do not sit in isolation; they talk to external chips. The timing engine must know when data arrives at input ports and when external chips expect data from output ports. Core Principles of Static Timing Analysis (STA) :

: Automatic mapping of single-bit registers to multibit components to save area and reduce power. picture.iczhiku.com Core Functional Areas Design Compiler Optimization Reference Manual

With the prevalence of SoCs, the guide highlights constraints for asynchronous clock domains. It details how to set false paths between asynchronous clocks while ensuring synchronization logic (like double flops) is correctly constrained.

Models clock jitter (random phase variations) and skew (spatial distribution delay variations). This acts as a safety margin during optimization.

# Generate a highly detailed report for the top 10 failing paths report_timing -delay_type max -max_paths 10 -input_pins -nets Use code with caution. Analyzing the Report Blueprint Accurately defining them is the most critical step

Converts logic into a sum-of-products format, removing intermediate structures to maximize speed at the expense of area. 6. Environmental and Physical Constraints

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# Define a path that requires 2 clock cycles for setup set_multicycle_path 2 -setup -from [get_pins src_reg/Q] -to [get_pins dest_reg/D] # Adjust the hold check to occur one cycle before the new setup edge (standard SDC behavior) set_multicycle_path 1 -hold -from [get_pins src_reg/Q] -to [get_pins dest_reg/D] Use code with caution. 5. Optimization Strategies in Synopsys Tools

# Creates a 200MHz clock (5ns period) with a 50% duty cycle on the 'sys_clk' port create_clock -name SYS_CLK -period 5.0 [get_ports sys_clk] Use code with caution. Generated Clocks