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  • Problem with randc

Problem with randc

SystemVerilog 6745
randc usage constraint 2
Azmo
Azmo
Full Access
13 posts
January 24, 2018 at 12:25 am

Hello, first post of a beginning programmer here :)

I have an issue understanding how randc works. Below is a snippet of my sample code. From my understanding i should receive a full set of numbers between 0 and 13. Instead i got 0 twice, but no 11. What am i doing wrong? 

randc bit [3:0] randomizer;
constraint 0_13 {randomizer inside {[0:13]};}
 
...
 
repeat 14
begin
randomize(randomizer);
$display("%d",randomizer);
end

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Solution

Solution

dave_59
dave_59
Forum Moderator
11281 posts
January 24, 2018 at 1:40 am

In reply to Azmo:

I cannot repeat your results. Please show an MCVE, like this: 

module top;
class A;
randc bit [3:0] randomizer;
constraint a_13 {randomizer inside {[0:13]};}
function void run;
   repeat (14)
     begin
	randomize(randomizer);
	$display("%d",randomizer);
     end
   endfunction
endclass
 
   A a=new;
   initial a.run; 
endmodule

— Dave Rich, Verification Architect, Siemens EDA

Azmo
Azmo
Full Access
13 posts
January 24, 2018 at 2:00 am

Well... it is a bit of a mess. I am actually writing a test for an UVM project and I really should have mentioned it (and put it into the other forum section) from the beginning.

I already did a workaround by creating a static array containing all numbers between 0 and 13 and reshuffling it in place of using randc. Next time I run into randc I would give it more thought, but right now my plate is full with lots of other issues.

Thanks for the quick replay though!

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