What are the constraints for synthesis?
Synthesis constraints are used to direct the synthesis tool to perform specific opera- tions.
As an example, consider the synthesis constraint CLOCK_BUFFER.
This constraint is used to specify the type of clock buffer used on the clock port..
What are the constraints in ASIC design?
Constraints may be period, frequency, net skew, maximum delay between end points, or maximum net delay Again, The designer uses an industry standard format 'SDC' Synopsys Design Constraints..
What does the SDC file contain?
sdc file contains the following basic constraints that you typically include for most designs: Definitions of clockone and clocktwo as base clocks, and assignment of those constraints to nodes in the design..
What is the significance of area and timing constraints in HDL based VLSI design?
Timing constraints may affect all internal timing interconnections, delays through logic and LUTs and between flip-flops or registers.
Timing constraints can be either global or path-specific.
Area constraints are used to map specific circuitry to a range of resources within the FPGA..
What is the timing constraint editor?
The Timing Constraints Editor enables you to create, view, and edit timing constraints.
This editor includes powerful visual dialogs that guide you toward capturing your timing requirements and timing exceptions quickly and correctly..
Why are constraints necessary for FPGA design?
They allow the design team to specify the performance requirements of the design and to help the tools to meet those requirements.
Design constraints and timing constraints are important in FPGA design because they not only tell the tools what to optimize, but also tell the tools what to report on..
Why do we need timing constraints?
Timing constraints may be used to influence and guide the placement of design elements and signal routes between placed elements in order to meet design performance requirements.
The two general types of timing constraints are global and path-specific.
Global timing constraints cover all paths within the logic design..
- Constraints are the instructions that the designer apply during various step in VLSI chip implementation, such as logic synthesis, clock tree synthesis, Place and Route, and Static Timing Analysis.
They define what the tools can or cannot do with the design or how the tool behaves. - 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 - STA then checks for violations of timing constraints, such as setup and hold constraints: A setup constraint specifies how much time is necessary for data to be available at the input of a sequential device before the clock edge that captures the data in the device.
- Synthesis constraints are used to direct the synthesis tool to perform specific opera- tions.
As an example, consider the synthesis constraint CLOCK_BUFFER.
This constraint is used to specify the type of clock buffer used on the clock port. - This SDC file includes various types of constraints such as set driving cells, set load, design rule constraints, clock constraints, virtual clock constraints, and non-ideal clock constraints.
