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Coverage

Summary

To understand the verification progress you need to answer the following questions:

  • Were all the design features and requirements identified in the testplan verified?
  • Were there lines of code or structures in the design model that were never exercised?

Coverage is the metric we use during simulation to help us answer these questions, in other words is a simulation metric we use to measure verification progress and completeness.

Coding Guidelines

Tip

  • Use conditional compilation guards to avoid compiling the same include file more than once. 
    var_name = transaction_type::type_id::create("var_name");

Code Example

sequence_item.sv
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`ifndef GPIO_UVC_SEQUENCE_ITEM_SV
`define GPIO_UVC_SEQUENCE_ITEM_SV

class gpio_uvc_sequence_item extends uvm_sequence_item;

  `uvm_object_utils(gpio_uvc_sequence_item)

  rand gpio_uvc_data_t       gpio_pin;
  rand gpio_uvc_item_type_e  trans_type;
  rand gpio_uvc_item_delay_e delay_enable;
  rand int unsigned          delay_duration_ps;

  extern function new(string name = "");

  extern function void do_copy(uvm_object rhs);
  extern function bit do_compare(uvm_object rhs, uvm_comparer comparer);
  extern function void do_print(uvm_printer printer);
  extern function string convert2string();

  // IMPORTANT -timescale=1ps/100fs to avoid Verdi errors
  constraint delay_c {
    soft delay_duration_ps inside {[1_000 : 10_000]};  // 1ns - 10ns
  }

endclass : gpio_uvc_sequence_item


function gpio_uvc_sequence_item::new(string name = "");
  super.new(name);
endfunction : new


function void gpio_uvc_sequence_item::do_copy(uvm_object rhs);
  gpio_uvc_sequence_item rhs_;
  if (!$cast(rhs_, rhs)) `uvm_fatal(get_type_name(), "Cast of rhs object failed")
  super.do_copy(rhs);
  gpio_pin = rhs_.gpio_pin;
  trans_type = rhs_.trans_type;
  delay_enable = rhs_.delay_enable;
  delay_duration_ps = rhs_.delay_duration_ps;
endfunction : do_copy


function bit gpio_uvc_sequence_item::do_compare(uvm_object rhs, uvm_comparer comparer);
  bit result;
  gpio_uvc_sequence_item rhs_;
  if (!$cast(rhs_, rhs)) `uvm_fatal(get_type_name(), "Cast of rhs object failed")
  result = super.do_compare(rhs, comparer);
  result &= (gpio_pin == rhs_.gpio_pin);
  return result;
endfunction : do_compare


function void gpio_uvc_sequence_item::do_print(uvm_printer printer);
  if (printer.knobs.sprint == 0) `uvm_info(get_type_name(), convert2string(), UVM_MEDIUM)
  else printer.m_string = convert2string();
endfunction : do_print


function string gpio_uvc_sequence_item::convert2string();
  string s;
  s = super.convert2string();
  $sformat(s, "gpio_pin = 'd%5d, 'h%4h", gpio_pin, gpio_pin);
  if (delay_enable == GPIO_UVC_ITEM_DELAY_ON) begin
    s = {s, $sformatf(", delay_enable: %5d, delay_duration_ps: %5d", delay_enable, delay_duration_ps)};
  end
  return s;
endfunction : convert2string

`endif // GPIO_UVC_SEQUENCE_ITEM_SV

Reference Material

Accellera

Verification Methodology Cookbooks

Source Code