Synthesizable code

Definition

Synthesizable code refers to code written in hardware description languages (HDLs) like SystemVerilog that can be transformed into a physical hardware implementation, such as an integrated circuit. This type of code adheres to specific coding styles and constructs that allow synthesis tools to interpret the design and generate the corresponding hardware layout effectively. Understanding synthesizable code is crucial because not all constructs in HDLs are suitable for synthesis, impacting the design's functionality and performance.

5 Must Know Facts For Your Next Test

1. Synthesizable code must use constructs that can be mapped to hardware resources, like registers and combinational logic.
2. Common synthesizable constructs include `always` blocks, `assign` statements, and various data types such as `logic` and `reg`.
3. Certain features like delays, events, or non-blocking assignments can lead to non-synthesizable code and should be avoided in synthesis.
4. Toolchain support is essential, as different synthesis tools may have specific requirements or limitations for synthesizing code.
5. Verifying synthesizability during the design phase helps avoid costly redesigns and ensures that the intended functionality can be achieved in hardware.

Review Questions

• What are the key characteristics of synthesizable code in SystemVerilog, and why are they important?
  • Key characteristics of synthesizable code in SystemVerilog include the use of specific constructs that map directly to hardware components like registers and logic gates. These characteristics ensure that synthesis tools can effectively interpret the design and create a functional hardware implementation. Importance lies in the fact that using non-synthesizable constructs can result in designs that cannot be physically realized, leading to significant project delays or failures.
• Compare synthesizable code and non-synthesizable code, highlighting their roles in the design process.
  • Synthesizable code is designed for implementation in hardware, allowing for direct conversion into physical components via synthesis tools. In contrast, non-synthesizable code is primarily used for simulation purposes or testbenches, enabling designers to validate their designs without generating physical hardware. Understanding the distinction is crucial as it influences how engineers approach design verification and ensures that functional requirements are met before hardware deployment.
• Evaluate how adherence to synthesizable coding practices influences project outcomes in digital design.
  • Adherence to synthesizable coding practices significantly impacts project outcomes by ensuring that designs can be efficiently converted into functional hardware. By following best practices, designers minimize the risk of encountering synthesis issues, which can lead to costly revisions or project delays. Additionally, a focus on synthesizability enhances collaboration among team members and improves overall project efficiency, as everyone works with a clear understanding of what can be realized in physical terms.

Related terms

HDL: Hardware Description Language, a specialized language used to describe the structure and behavior of electronic circuits.

synthesis: The process of converting HDL code into a netlist of gates that can be implemented on a physical chip.

non-synthesizable code: Code that cannot be converted into a hardware implementation, often used for simulation or testbenches.