: Used for setup analysis. It tells the tool that the external device takes up to 0.6 ns to drive the data, leaving less time for internal logic. -min : Used for hold analysis. Output Delay
The emphasizes that successful timing closure is not just about fixing violations at the end but about proper constraint management from the very beginning. By utilizing the 2021 methodologies—specifically formal SDC verification and structured optimization—designers can significantly shorten Time-to-Results (TTR) and achieve higher QoR. If you'd like, I can:
: Use Synopsys Timing Constraints Manager to catch SDC errors before starting long synthesis runs.
create_generated_clock -name DIV_CLK -source [get_ports sys_clk] -divide_by 2 [get_pins clk_div_reg/Q] Use code with caution.
The is a critical resource for ASIC and FPGA designers using tools like Design Compiler, Fusion Compiler, and PrimeTime. The 2021 release (specifically version S-2021.06 ) provides standardized methodologies for defining design intent via Synopsys Design Constraints (SDC) . Key Content Overview
: The guide explains how to interpret "slack"—the difference between the required arrival time and the actual arrival time. A negative slack indicates a timing violation that must be addressed through optimization.
Don't read it front to back. Do this instead:
A must-read for and Front-End engineers working with PrimeTime, DC, or Fusion Compiler.
: Defining drive characteristics (driving cells/resistance) and port load capacitance. 3. Advanced Optimization Features
: Subtracted from the available clock period, making the setup check more stringent.
Disclaimer: This article is a synthesis of general knowledge regarding Synopsys 2021 methodologies and does not replace the official documentation. If you want me to, I can provide: A guide on how to
The 2021 guide is built on Synopsys Design Constraints (SDC) version 2.1. While the basics remain, the guide provides critical nuance for complex SoCs.
: Accounting for clock source latency, ideal network latency, and clock uncertainty (skew and jitter).