Home Articles SystemVerilog Method Manipulation In SV and e

Search

Method Manipulation In SV and e PDF Print E-mail
User Rating: / 5
PoorBest 
Thursday, 24 December 2009 16:46

If you're familiar with SystemVerilog and taking your first steps in e (or vice versa) you might find this useful. Here are some of the most common method manipulations that you''ll need to master and how you should go about implementing them in e and SV:

 

Before we dive in - here's the reference code for the examples we're going to show you.

// ** e **
struct my_struct {
 my_function() is {};
 my_task1()@sys.any is {};
 my_task2()@sys.any is {};
 };
// ** SystemVerilog **
class parent;
 // must be virtual
 virtual function my_function();
 endfunction
 virtual task my_task1();
 endtask
 virtual task my_task2();
 endtask
 endclass

OK, now let''s see how to implement the most common method manipulations in each language:


Extending methods - adding more functionality at the end:

// ** e **
 extend parent {
 my_function() is also {
 j++;
 };
 };
 
 // ** SV **
 class child extends parent;
 virtual function my_function();
 super.my_function();
 j++;
 endfunction;
 endclass


Extending methods - adding stuff to the beginning of a method:

// ** e **
 extend parent {
 my_function() is first {
 j++;
 };
 };
 
 // ** SV **
 class child extends parent;
 virtual function my_function();
 j++;
 super.my_function();
 endfunction;
 endclass


Overriding a method:

// ** e **
 extend parent {
 my_function() is only {
 j++;
 };
 };
 
 // ** SV **
 class child extends parent;
 virtual function my_function();
 j++;
 endfunction;
 endclass


Launching parallel threads - parent process not blocked:

// ** e ** 
 foo()@sys.any is {
 start my_task1();
 start my_task2();
 };
 
 // ** SV **
 task foo();
 fork begin 
 my_task1();
 my_task2();
 join_none; 
 endfunction


Launching parallel threads - parent process blocked until shortest thread completes:

// ** e ** 
 foo()@sys.any is {
 first of {
 { my_task1(); };
 { my_task2(); };
 };
 };
 
 // ** SV **
 function foo();
 fork begin 
 my_task1();
 my_task2();
 join_any;
 disable fork;    // remove if you don''t want to kill the longer task prematurely
 endfunction


Launching parallel threads - parent process blocked until all threads are finished:

// ** e ** 
 foo()@sys.any is {
 all of {
 { my_task1(); };
 { my_task2(); };
 };
 };
 
 // ** SV **
 function foo();
 fork begin 
 my_task1();
 my_task2();
 join;
 endfunction

 

 
More articles :

» About UVM And You

There’s been a lot of buzz about the lately and for a reason. The Universal Verification Methodology is about to change the rules of the game pretty soon, if not already. That is interesting because not too long ago verification engineers...

» Review - Verification Leadership Seminar

How many of you have tried to cut on coffee? or even quit drinking coffee altogether? I guess a lot. Well, personally I’ve given up on trying but you know what? there’s actually something worse than having 8 cups of coffee per day - it’s the...

» Useful OVM-e Snippets

How to activate Specman Profiler? How to get rid of automatic vr_ad coverage? Let's find out.

» Let The New Game Begin

Things are changing. The EDA industry is changing, and the verification world is changing (check out Janick Bergeron's inspiring at SNUG San Jose for a glimpse of the future of verification). One of the major challenges we’re already facing today...

» Be Assertive

You know what they way - sometimes small things can make a big difference. Setting your A/C thermostat to a reasonable temperature can help save energy, sending flowers to someone you care about and so on. This is also true in programming. Sometimes...

Comments  

 
0 #1 2010-04-17 16:43
Very simple and very informative article.
Quote
 

Add comment


Security code
Refresh

Copyright © 2018 Think Verification - Tips & Insights on ASIC Verification. All Rights Reserved.
Joomla! is Free Software released under the GNU/GPL License.