Home Specman / e Packing In OVM-e


Packing In OVM-e PDF Print E-mail
User Rating: / 0
Thursday, 24 December 2009 16:40

This example shows how to pack a struct into a list of Double Words (32 bit) keeping the original order. This time we got less talking, and more code:



Here's our struct:

struct my_struct_s { %byte1: byte;
 %word1: uint(bits: 16);
 %byte2: byte;
 %byte3: byte;
 %byte4: byte;
 %data1: uint(bits:11);
 %dword1: uint(bits: 32);
 %data2: uint(bits: 5);
keep byte1 == 0x12;
 keep word1 == 0x3456;
 keep byte2 == 0x78;
 keep byte3 == 0x9a;
 keep byte4 == 0xff;
 keep data1 == 11''b10101010101;
 keep dword1 == 32''b01010111111111111111101010101010;
 keep data2 == 5''b10101;

Let's instantiate it and pack it:

extend sys { my_struct: my_struct_s;
 run() is also {
 print my_struct using hex; // just for reference
 var my_list: list of uint(bits:32);
 my_list = pack(packing.high, my_struct);  // stage 1, pack
 my_list = my_list.reverse(); // stage 2, reverse to restore original order
 print my_list using hex;

And here's what the output should look like, note that the list reflects the original bit order

my_struct = my_struct_s-@0: my_struct_s
----------------------------------------------  @temp
0       %byte1:                         0x12
1       %word1:                         0x3456
2       %byte2:                         0x78
3       %byte3:                         0x9a
4       %byte4:                         0xff
5       %data1:                         0x555
6       %dword1:                        0x57fffaaa
7       %data2:                         0x15
my_list =
0.      12345678
1.      9affaaaa
2.      ffff5555
No actual running requested.
Checking the test ...
Checking is complete - 0 DUT errors, 0 DUT warnings.


More articles :

» Latest Buzz From The EDA & Verification Community

{loadposition pos101}{loadposition pos102}{loadposition pos103}{loadposition pos104}{loadposition pos105}{loadposition pos106}{loadposition pos107}{loadposition pos108}{loadposition pos109}{loadposition pos110}{loadposition pos111}{loadposition...

» Future Trends In HR

The industry is going through some tough times, no doubt about it. We’ve seen layoffs worldwide, projects being cancelled or put off for better times. How is this going to affect the way companies manage their human resources? Joining us today for...

» 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...

» VMM Hackers Guide - Default Behavior For Your BFM

Here's a short tutorial on how to implement a default behavior for your BFM using VMM. Some protocols require constant activity on their interface even when you don't have any data to transmit. This means you must have a mechanism that drives idle...

» AutoDup: Create Test Variants Quickly (Free Utility)

Coverage driven verification has a big advantage – you can write a single test, and let run it several times with random seeds. Each run will generate a slightly different scenario – depending on the nature of the constraints you provided....

Add comment

Security code

Copyright © 2019 Think Verification - Tips & Insights on ASIC Verification. All Rights Reserved.
Joomla! is Free Software released under the GNU/GPL License.