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I'm sharing this code, which is an example of using an SV
Interface to transmit a class of data & functions to a DUT.
// Todd Mackett Cadence Design Systems
// ncverilog class_across_interface.sv +sv +linedebug +gui
// tested wtih IUS5.83s1
| test --->interface---->dut |
class some_class; //class is the rudimentry data container
protected string some_string; // needs to be protected for IUS5.83
function void set_data (int i, real r, string s);
some_real = r;
some_string = s;
task get_data(output int i, output real r, output string s);
i = some_int;
r = some_real;
s = some_string;
function void print_data();
$display("Int: %d, Real: %f, String: %s", some_int, some_real, some_string);
// This channel is an interface that is a queue of classes
function int some_classQ_size();
task push_class_in_Q(input some_class Qin);
task pop_class_out_Q(output some_class Qout);
Qout = some_classQ.pop_back();
reg clk = 'b1;
forever clk = #10 ~clk; // system clk
myIF myIFi(); // instantiate interface
test testi(clk, myIFi);
dut duti(clk, myIFi);
// The test module create a class of information and puts it in the
// channel (a queue in the interface)
module test (input clk, myIF myIFi);
always @(posedge clk)
top_class = new;
// randomize the data per class object
i = $urandom_range(5,1);
1: r = 3.14;
1: r = 123.456;
1: r = -943.825;
1: s = "IUS SystemVerilog";
1: s = "Cadence";
1: s = "Who needs VHDL?";
top_class.set_data(i, r, s); // set the values into class
myIFi.push_class_in_Q(top_class); // transmit the class
-> myIFi.some_event; // cause the event
// The dut module consumes the class when the event is valid
// and displays its contents as it comes across the interface
module dut (input clk, myIF myIFi);
some_class dut_class =new;
always @(myIFi.some_event) // process event
$display("\nQueue Size %d",myIFi.some_classQ_size() );
Hi Todd, Thanks for the code share, it helps!Your compile command is:>> ncverilog class_across_interface.sv +sv +linedebug +guiRecently CDN ran a Specman Debug survey which I also gave my inputs. Will NC reuse some of the excellent debug capabilities of Specman or will it all benewly built under Simvision? I would prefer the former as Veristy had done an excellent job there and CDN has the enviable lead among vendors in that domain. Esecially on this example you showed class under module and +gui option Are classes/instances/objects visible as waveform in Simvision? As you would know Specman had a nice way of doing it for years, it will be really sad if that can't be reused for SV under NC.BTW - will there by any consolidated report on the debug survey conducted recently by CDN? ThanksAjeetha, CVCwww.noveldv.com
>> ncverilog class_across_interface.sv +sv +linedebug +guiRecently CDN ran a Specman Debug survey which I also gave my inputs. Will NC reuse some of the excellent debug capabilities of Specman or will it all benewly built under Simvision? I would prefer the former as Veristy had done an excellent job there and CDN has the enviable lead among vendors in that domain. Esecially on this example you showed class under module and +gui option Are classes/instances/objects visible as waveform in Simvision? As you would know Specman had a nice way of doing it for years, it will be really sad if that can't be reused for SV under NC.BTW - will there by any consolidated report on the debug survey conducted recently by CDN? ThanksAjeetha, CVCwww.noveldv.com