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Verilog and SystemVerilog often generically referred to as just "Verilog" in this document can be written in vastly different styles, which can lead to code conflicts and code review latency. This style guide aims to promote Verilog readability across groups. This style guide defines style for both Verilog and SystemVerilog compliant code.
Additionally, this style guide defines style for both synthesizable and test bench code. See the Appendix for a condensed tabular representation of this style guide.
No style guide is perfect. There are times when the best path to a working design, or for working around a tool issue, is to simply cut the Gordian Knot and create code that is at variance with this style guide.
It is always okay to deviate from the style guide by necessity, as long as that necessity is clearly justified by a brief comment, as well as a lint waiver pragma where appropriate. All RTL and tests should be developed in SystemVerilog, following the IEEE SystemVerilog standardexcept for prohibited features, assignment master style.
The standards document is available free of cost through IEEE GET a registration is required, assignment master style. This section addresses primarily aesthetic aspects of style: line length, indentation, spacing, etc. Use the. sv extension for SystemVerilog files or. svh for files that are included via the preprocessor.
sv and. v files are intended to be compilation units. svh and. With exceptions of netlist files, assignment master style, each. sv or. v file should contain only one module, and the name should be associated. For instance, file foo. sv should contain only the module foo. Line-wrapping contains additional guidelines on how to wrap long lines.
Use spaces to indent or assignment master style text. See Indentation for rules about assignment master style and wrapping.
To convert tabs to spaces on any file, you can use the UNIX expand utility. Use begin and end unless the whole statement fits on a single line, assignment master style. If a statement wraps at a block assignment master style, it must use begin and end.
Only if a whole semicolon-terminated statement fits on a single line can begin and end be omitted. begin must be on the same line as the preceding keyword, and ends the line. end must start a new line. end else begin must be together on one line, assignment master style. The only exception is if end has a label, a following else should be on a new line. The above style also applies to individual case items within a case statement.
begin and end may be omitted if the entire case item the case expression and the associated statement fits on a single line. Otherwise, use the begin keyword on the same line as the case expression. Use spaces for indentation. Do not use tabs. You should set your editor to emit spaces when you hit the tab key. Assignment master style add an additional level of indentation to the enclosed sections of all paired keywords. When wrapping a long expression, indent the continued part of the expression by four spaces, assignment master style, like this:.
Or, if it improves readability, assignment master style the continued part of the expression with a grouping open parenthesis or brace, like this:. Operators in a wrapped expression can be assignment master style at either the end or the beginning of each line, but this must be done consistently within a file. Open syntax characters such as { or that assignment master style one line of a multi-line expression should be terminated with close characters }on their own line.
Indent the conditional branches of text as if the preprocessor directives were absent. Non-branching preprocessor directives must follow the same indentation rules as the regular code. Un-indented branching preprocessor directives disrupt the flow of reading to emphasize that there is conditional text. Leaving conditional branch text un-indented will result in post-preprocessed text looking properly indented.
For multiple items on a line, one space must separate the comma and the next character. Tabular alignment groups two or more similar lines so that the identical parts are directly above one another. This alignment makes it easy to see which characters are the same and which characters are different between lines.
The use of tabular alignment is required for some constructs as detailed in the corresponding subsection of this guide. Exception: when declaring a bit vector, assignment master style, it is acceptable to use the compact notation. For example:. When splitting alternation assignment master style into multiple lines, assignment master style, use a format that is similar to an equivalent if-then-else line.
Add one space before type parameters, except when the type is part of a qualified name. A qualified name contains at least one scope :: operator connecting its segments. A space in a qualified name would break the continuity of a reference to one symbol, so it must not be added. Parameter lists must follow the space-after-comma rule, assignment master style. There must be no whitespace before a case item's colon; there assignment master style be at least one space after the case item's colon.
Function and task calls must not have any spaces between the function name or task name and the open parenthesis. Macro assignment master style must not have any spaces between the macro name and the open parenthesis. The position of alignment only needs to be beyond the rightmost extent of a multi-line macro by at least one space, when a space does not split a token, but should not exceed the maximum line length. In any instance where a reasonable human would need to expend thought or refer to an operator precedence chart, use parentheses instead to make the order of operations unambiguous.
Ternary expressions nested in the true condition of another ternary expression must be enclosed in parentheses, assignment master style. While the following nested ternary has only one meaning to the compiler, assignment master style, the meaning can be unclear and error-prone to humans:.
Parentheses may be omitted if the code formatting conveys the same information, for example when describing a priority mux. A comment on its own line describes the code that follows.
A comment on a line with code describes that line of code. It can sometimes be useful to structure the code using header-style comments in order to separate different functional parts like FSMs, assignment master style, the main datapath or registers within a module. in nested for loop blocksassignment master style, the preferred way is to use a single-line comment with no extra delineators, as shown in the examples below.
Signals must be declared before they assignment master style used. This means that implicit net declarations must not be used.
Within modules, it is recommended that signals, types, enums, and localparams be declared close to their first use.
This makes it easier for the reader to find the declaration and see the signal type. In this context, constants are distinct from tuneable parameters for objects such as parameterized modules, classes, etc. The preferred method of defining constants is to declare a package and declare all constants as a parameter within that package. If the constants are assignment master style be used in only one file, it is acceptable to keep them defined within that file rather than a separate package.
Other packages may also be declared with their own parameter constants to facilitate the creation of IP that may be re-used across many projects. The units for a constant should be described in the symbol name, unless the constant is unitless or the units are "bits. Use parameter to parameterize, and localparam to declare module-scoped constants.
Within a package, use parameter. Use the keyword parameter within the module declaration of a parameterized module to indicate what parameters the user assignment master style expected to tune at instantiation. The preferred naming convention for all parameters is UpperCamelCase.
Derived parameters within the module declaration should use localparam. An example is shown below. Use package parameters to transmit global constants through a hierarchy instead of parameters. To declare a constant whose scope is internal to the particular SystemVerilog module, use localparam instead.
Use the type of the parameter to help constrain the legal range. int unsigned for general non-negative integer values, bit for boolean values. Any further restrictions on tuneable parameter values must be documented with assertions.
For additional reading, see New Verilog Techniques for Creating Parameterized Models. A global define is a tick-defined macro in a header file that is shared by all source files in a project. To reduce namespace collisions, global defines should be prefixed by the name of a group of related macros, followed by a pair of underscores:, assignment master style. A local define is a tick-defined macro that should only be used within the scope of a single local file.
It must be assignment master style undefined after use, to avoid polluting the global macro namespace. To indicate that a macro is only meant to be used in the local scope, the macro name should be prefixed with a single underscore.
Suffixes are used in several places to give guidance to intent. The following table lists the suffixes that have special meaning.
The Chic Assignment - October 2021
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