Hello all,
I have an issue with transition coverpoint, it is not getting sampled, whenever the ".sample" method is called. But it is getting sampled when there is a sampling event with covergroup!!
1) With sample method(not working)
module test();
logic [7:0] addr;
reg ce;
covergroup address_cov (); // @ (posedge ce);
ADDRESS : coverpoint addr {
// simple transition bin
bins adr_0_to_1 = (0=>1);
bins adr_1_to_0 = (1=>0);
bins adr_1_to_2 = (1=>2);
bins adr_2_to_1 = (1=>0);
bins adr_0_1_2_3 = (0=>1=>2=>3);
bins adr_1_4_7 = (1=>4=>7);
}
endgroup
address_cov my_cov = new();
initial begin
ce <= 0;
addr <= 0;
$monitor("ce %b addr 8'h%x",ce,addr);
repeat (10) begin
ce <= 1;
my_cov.sample(); // Calling the sample method
#10;
ce <= 0;
addr ++;
#10;
end
end
endmodule2) Working code
module test();
logic [7:0] addr;
reg ce;
covergroup address_cov () @ (posedge ce);
ADDRESS : coverpoint addr {
// simple transition bin
bins adr_0_to_1 = (0=>1);
bins adr_1_to_0 = (1=>0);
bins adr_1_to_2 = (1=>2);
bins adr_2_to_1 = (1=>0);
bins adr_0_1_2_3 = (0=>1=>2=>3);
bins adr_1_4_7 = (1=>4=>7);
}
endgroup
address_cov my_cov = new();
initial begin
ce <= 0;
addr <= 0;
$monitor("ce %b addr 8'h%x",ce,addr);
repeat (10) begin
ce <= 1;
#10;
ce <= 0;
addr ++;
#10;
end
end
endmodulewhy it is not working with ".sample" method? why it is working for the sampling event (i.e:- "posedge ce")?
