CODEWITHSUNDEEP
system-verilog
EquipDev
EquipDev

Reputation: 5931

How to more easily make coverpoints for each bit in a bus?

In a design there is a bus with 4 bits, thus alfa[3:0], and I want to make a covergroup that shows if all bit have been both 0 and 1.

One way to do this coule be to write it out like:

covergroup alfa_cv @(posedge clk);
  coverpoint alfa[0];
  coverpoint alfa[1];
  coverpoint alfa[2];
  coverpoint alfa[3];
endgroup

alfa_cv alfa_covergroup = new;

But is there an easier way to make coverpoints to cover each of the bits in a bus?

Upvotes: 0

Views: 4916

Answers (2)

Karan Shah
Karan Shah

Reputation: 1992

As everyone mentioned over here, you don't need to write a covergroup for this purpose, as the toggle coverage will take care of it.

However, if you want to write a covergroup then you can directly use alfa as coverpoint, as follow.

covergroup alfa_cv @(posedge clk);
  coverpoint alfa;
endgroup

Upvotes: 0

dave_59
dave_59

Reputation: 42698

Usually code coverage includes toggle coverage. You shouldn't have to create a covergroup for this. But you can create an array of covergroups

covergroup cg(input int index, ref bit [31:0] bus) @(posedge clk);
  each_bit: coverpoint bus[index];
  option.per_instance = 1;
endgroup

cg cgbits[32];

for (int index=0; index<$size(alfa);index++)  
   cgbits[index] = new(index,alfa);

Upvotes: 1

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