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Concept
SystemVerilog
Summary
SystemVerilog, standardized as IEEE 1800, is a hardware description and hardware verification language used to model, design, simulate, test and implement electronic systems. SystemVerilog is based on Verilog and some extensions, and since 2008, Verilog is now part of the same IEEE standard. It is commonly used in the semiconductor and electronic design industry as an evolution of Verilog.
SystemVerilog started with the donation of the Superlog language to Accellera in 2002 by the startup company Co-Design Automation. The bulk of the verification functionality is based on the OpenVera language donated by Synopsys. In 2005, SystemVerilog was adopted as IEEE Standard 1800-2005. In 2009, the standard was merged with the base Verilog (IEEE 1364-2005) standard, creating IEEE Standard 1800-2009. The current version is IEEE standard 1800-2017.
The feature-set of SystemVerilog can be divided into two distinct roles:
SystemVerilog for register-transfer level (RTL) design is an extension of Verilog-2005; all features of that language are available in SystemVerilog. Therefore, Verilog is a subset of SystemVerilog.
SystemVerilog for verification uses extensive object-oriented programming techniques and is more closely related to Java than Verilog. These constructs are generally not synthesizable.
The remainder of this article discusses the features of SystemVerilog not present in Verilog-2005.
There are two types of data lifetime specified in SystemVerilog: static and automatic. Automatic variables are created the moment program execution comes to the scope of the variable. Static variables are created at the start of the program's execution and keep the same value during the entire program's lifespan, unless assigned a new value during execution.
Any variable that is declared inside a task or function without specifying type will be considered automatic. To specify that a variable is static place the "static" keyword in the declaration before the type, e.g., "static int x;". The "automatic" keyword is used in the same way.
Official source
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