SV program与module的区别

最新推荐文章于 2024-04-05 11:07:36 发布

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最新推荐文章于 2024-04-05 11:07:36 发布

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原文链接：http://www.cnblogs.com/chenrui/archive/2012/04/06/2434000.html

本文深入探讨了模块与程序块之间的相似性和差异性，包括它们的输入、输出、内部组件以及如何在设计环境中交互。重点区分了程序块不能包含always语句等特性，展示了模块与程序块在不同技术领域的应用区别。

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A module and a program block carry many similarities.

Similar to a module, a program block may have zero or more inputs, outputs and inout ports.A program block can contain zero or more initial blocks, cont assignments, generate and specparam statements, concurrent assertions and timunit declarations.Type and data declarations, functions and tasks can be defined within a program block similar to what you can do in a module.A hierarchy can contain any number of program blocks. These program blocks may interact throughtheir ports or may be isolated from one other. This is how modules work too in a design environment.

However, the similarities end there. Here are some of the differences.

A program block can not contain any always statement, UDP, module, interface or other program. Thus a program block is always a leaf level node in a hierarchy.A program definition can occur within a module as we saw earlier. Obviously, a module can not be defined this way.A program can call a task or function in modules or other programs. But a module can not call a task or function in a program.

However, the biggest difference between a program and a module is the way they handle variable assignments in procedural blocks. We will see in the next section this is where the utility of a program comes into effect.

reference

http://www.project-veripage.com/program_blocks_2.php

转载于:https://www.cnblogs.com/chenrui/archive/2012/04/06/2434000.html