By Stuart Sutherland, Simon Davidmann, Peter Flake, P. Moorby
SystemVerilog is a wealthy set of extensions to the IEEE 1364-2001 Verilog Description Language (Verilog HDL). those extensions tackle significant elements of HDL-based layout. First, modeling very huge designs with concise, actual, and intuitive code. moment, writing high-level attempt courses to successfully and successfully be sure those huge designs.
The first version of this publication addressed the 1st element of the SystemVerilog extensions to Verilog. very important modeling good points have been awarded, similar to two-state info varieties, enumerated forms, user-degined forms, buildings, unions, and interfaces. Emphasis used to be put on the right kind utilization of those improvements for simulation and synthesis.
SystemVerilog for layout, moment version has been generally revised on a bankruptcy through bankruptcy foundation to incorporate the various textual content and instance updates had to mirror adjustments that have been made among the 1st variation of this ebook was once written and the finalization of the hot ordinary. it will be significant that the ebook mirror those syntax and semantic adjustments to the SystemVerilog language.
In addition, the second one variation includes a new bankruptcy that explanis the SystemVerilog "packages", a brand new appendix that summarizes the synthesis instructions awarded through the booklet, and the entire code examples were up to date to the ultimate syntax and rerun utilizing the most recent model of the Synopsys, Mentor, and Cadance tools.
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Extra resources for SystemVerilog for Design: A Guide to Using SystemVerilog for Hardware Design and Modeling
Example text
On the other hand, module parity_check comes after the external declaration of parity in the source code order. Therefore, the parity_check module will use the external variable declaration. 4 Coding guidelines for importing packages into $unit SystemVerilog allows module ports to be declared as user-defined types. The coding style recommended in this book is to place those definitions in one or more packages. Example 2-2 on page 10, listed earlier in this chapter, illustrates this usage of packages.
Every design block or test block will see the same package variables. A value written to a package variable by one block will be visible to all other blocks. In single file compilations, each $unit space will have a unique variable that happens to have the same name as a variable in a different $unit space. Values written to a package variable by one design or test block will not be visible to other design or test blocks. static tasks and functions in packages are not synthesizable Static tasks and functions, or automatic tasks and functions with static storage, have the same potential problem.
The precision component tells the software tool how many decimal places of accuracy to use. In the following example, ‘timescale 1ns / 10ps the software tool is instructed to use time units of 1 nanosecond, and a precision of 10 picoseconds, which is 2 decimal places, relative to 1 nanosecond. Chapter 2: SystemVerilog Declaration Spaces 29 multiple The ‘timescale directive can be defined in none, one or more ‘timescale Verilog source files. Directives with different values can be specidirectives fied for different regions of a design.