Design compiler constraints and timing reference manual

  • How are timing constraints developed?

    From timing perspective, the designer creates timing constraints for synthesis which are a series of constraints applied to a given set of paths or nets that dictate the desired performance of a design.
    Constraints may be period, frequency, net skew, maximum delay between end points, or maximum net delay.

  • What are constraints in RTL?

    While the functionality of the design is represented by the RTL code, timing constraints play the role of influencing the performance parameters of the design.
    These performance parameters include power, area and timing..

  • What are the constraints applied during logic synthesis?

    The four types of constraints include synthesis, pin, area and timing.
    Synthesis constraints are used to instruct the synthesis tool on how to map the HDL code to RTL occurs.
    Pin constraints are used to specify the assignment of I/O..

  • What does SDC file contains in VLSI?

    An SDC (Synopsys Design Constraints) file is a text file that contains timing constraints for a digital design.
    The SDC file is used by the synthesis tool, place and route tool, and timing analysis tool to ensure that the design meets its timing requirements..

  • An SDC (Synopsys Design Constraints) file is a text file that contains timing constraints for a digital design.
    The SDC file is used by the synthesis tool, place and route tool, and timing analysis tool to ensure that the design meets its timing requirements.
  • The four types of constraints include synthesis, pin, area and timing.
    Synthesis constraints are used to instruct the synthesis tool on how to map the HDL code to RTL occurs.
    Pin constraints are used to specify the assignment of I/O.

How do I specify timing constraints?

When defining timing constraints you should consider that your design has synchronous paths and asynchronous paths.
Synchronous paths are constrained by s pecifying clocks in the design.
Use the create_clockcommand to specify a clock.
After specifying the clocks, it is recommended you also specify the input and output port timing specifications.

How do I use design compiler?

Analyze and resolve design problems.
Design Compiler can generate numerous reports, such as:

  • area
  • constraint
  • and timing reports
  • on the synthesis and optimization results.
    You use reports to analyze and resolve any design problems or to improve synthesis results.
    You can use the .

    • How does design compiler determine Max_transitionvalue?

    Design Compiler follows these rules in determining the max_transitionvalue:

  • • When the max_transitionattribute is set on a design or port and a clock group
  • the most restrictive constraint is used. • If multiple clocks launch the same paths, the most restrictive constraint is used.

    • How does design compiler preserve timing constraints?

    When preserving timing constraints, Design Compiler reassigns the timing constraints to appropriate adjacent, persistent pins (that is, pins on the same net that remain after ungrouping).
    The constraints are moved forward or backward to other pins on the same net.

    The Timing closure in VLSI design and electronics engineering is the process by which a logic design of a clocked synchronous circuit consisting of primitive elements such as combinatorial logic gates and sequential logic gates is modified to meet its timing requirements.
    Unlike in a computer program where there is no explicit delay to perform a calculation, logic circuits have intrinsic and well defined delays to propagate inputs to outputs.

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