Array of sequences

UVM
,
1

Hello,

https://verificationacademy.com/forums/systemverilog/creating-array-sequences

I referred to this post to understand how to create an array of sequences. I’d like some further clarifications.

I have a wreq seq, wdata seq and a top write seq (that forks of the 2 sequences in parallel, so they start at the same clk).

In my case, the wdata seq depends on some rand variables inside wreq_seq. I would like to simulate a case where multiple wreq sequences are issued before the 1st wdata seq.

Assuming I create an array of wreq sequences, how can I make a “wreq/wdata” pair before starting them ?

In words:

  1. make an array of wreq sequences
  2. make an array of wdata sequences, each wdata_seq should be formed by taking the random variables inside wreq seq into consideration.
  3. send multiple wreq sequences, followed by wdata sequences.

Please let me know your suggestions.

2

In reply to UVM_learner6:


class seq1 extends ..
rand int a,b;
endclass
 
class seq2 extends ..
rand int data;
rand int a,b;
constraint c1 { data == a*b; }
endclass
 
///test case
seq1 seq1_arr[10];
seq2 seq2_arr[10];

foreach(seq1_arr[i])begin
      seq1_arr[i] = seq1::type_id::create($sformatf("seq1_arr[%0d]",i));
      seq1_arr[i].randomize();
end

foreach(seq2_arr[i])begin
      seq2_arr[i] = seq2::type_id::create($sformatf("seq2_arr[%0d]",i));
      seq2_arr.randomize()with{ a==seq1_arr[i].a; b==seq1_arr[i].b; };
end

//start the sequence as per your requirement 
//send multiple wreq sequences, followed by wdata sequences.
foreach(seq1_arr[i])begin
     seq1_arr[i].start();
end
foreach(seq2_arr[i])begin
     seq2_arr[i].start();
end