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Distribution Constraint

SystemVerilog 6308
#System verilog 45 constraintdistribution 2
prasanthB
prasanthB
Forum Access
5 posts
October 13, 2022 at 12:59 am

Write a constraint for the 8-bit variable that provides distribution 70% for range 0-100 and the remaining 30% for range 101-255.

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Shubhabrata
Shubhabrata
Forum Access
94 posts
October 13, 2022 at 3:18 am

In reply to prasanthB:

Ratio will be 7:3
So I guess this will be the answer
constraint condition {variable_name dist{[0:100]:=7 , [101:255]:=3};}

prasanthB
prasanthB
Forum Access
5 posts
October 13, 2022 at 3:28 am

In reply to Shubhabrata:
Have u excute in EDA playground

Solution

Solution

dave_59
dave_59
Forum Moderator
10658 posts
October 13, 2022 at 3:24 pm

In reply to Shubhabrata:

That is incorrect. You need to use :/ instead of := so that the weight gets distributed across the range of values.

— Dave Rich, Verification Architect, Siemens EDA

Shubhabrata
Shubhabrata
Forum Access
94 posts
October 13, 2022 at 9:55 pm

In reply to prasanthB:

Nope. I had doubts regarding the distribution. Sir, cleared it.

Shubhabrata
Shubhabrata
Forum Access
94 posts
October 13, 2022 at 10:39 pm

In reply to dave_59:

I got the question wrong. I thought each value is having 75% weightage.

I have one thing to clarify. if I get distribution like -

constraint tag{data dist{7:=5 , [11:20]:=3 , [26:30]:/5};}

This one is providing dist of 12.5% for value 7, 7.5% for each value inside the range of 11-20 or 75% for that range, and 12.5% for the range 26-30.

Am I right or do I badly need to go through a probability course again?

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