VERA Functional Coverage Part




		cumulative coverage off
		Sometime it is desired that we don't want to have cumulative coverage. This is done with reserve word cumulative set to OFF.



		Example

		1 class coverage_cumulative_off { 2 bit [3:0] value; 3 event now; 4 5 coverage_group something { 6 sample_event = sync(ALL,now); 7 cumulative = OFF; 8 sample value; 9 } 10 11 task update_coverage (bit [3:0] value) { 12 this.value = value; 13 trigger(now); 14 } 15 } 16 17 18 19 program test { 20 coverage_cumulative_off cov [2]; 21 bit [3:0] v; 22 cov[0] = new(); 23 cov[1] = new(); 24 repeat (10) { 25 v = random(); 26 printf("Value is 0 %d\n",v); 27 cov[0].update_coverage(v); 28 v = random(); 29 printf("Value is 1 %d\n",v); 30 cov[1].update_coverage(v); 31 delay(1); 32 } 33 } You could download file coverage_cumulative_off.vr here

		Simulation log

		Value is 0 12 Value is 1 13 Value is 0 15 Value is 1 9 Value is 0 13 Value is 1 10 Value is 0 6 Value is 1 3 Value is 0 15 Value is 1 5 Value is 0 2 Value is 1 7 Value is 0 1 Value is 1 10 Value is 0 14 Value is 1 4 Value is 0 4 Value is 1 11 Value is 0 6 Value is 1 10

		Coverage Report

		Group : test::coverage_cumulative_off::something ==================================================== Group : test::coverage_cumulative_off::something ==================================================== Score Instances Weight Goal 87.50 50.00 1 100 2 Instances: cov[1] ---------------- Score Weight Goal 50.00 1 100 cov[0] ---------------- Score Weight Goal 50.00 1 100 ==================================================== Samples for Group : test::coverage_cumulative_off::something Variable Expected Covered Percent Goal Weight Total 16 14 87.50 value 16 14 87.50 100 1 ==================================================== Summary for variable value Expected Covered Percent Automatically Generated Bins 16 14 87.50 Automatically Generated Bins for value Uncovered bins name count at least [auto[0]] 0 1 [auto[8]] 0 1 Covered bins name count at least auto[1] 1 1 auto[2] 1 1 auto[3] 1 1 auto[4] 2 1 auto[5] 1 1 auto[6] 2 1 auto[7] 1 1 auto[9] 1 1 auto[10] 3 1 auto[11] 1 1 auto[12] 1 1 auto[13] 2 1 auto[14] 1 1 auto[15] 2 1 ==================================================== ==================================================== Group Instance : cov[1] ==================================================== Score Weight Goal 50.00 1 100 Group: test::coverage_cumulative_off::something ---------------- Score Instances Weight Goal 87.50 50.00 1 100 ==================================================== Samples for Group Instance : cov[1] Variable Expected Covered Percent Goal Weight Total 16 8 50.00 value 16 8 50.00 100 1 ==================================================== Summary for variable value Expected Covered Percent Automatically Generated Bins 16 8 50.00 Automatically Generated Bins for value Uncovered bins name count at least [auto[0] - auto[2]] -- -- (3 bins) [auto[6]] 0 1 [auto[8]] 0 1 [auto[12]] 0 1 [auto[14] - auto[15]] -- -- (2 bins) Covered bins name count at least auto[3] 1 1 auto[4] 1 1 auto[5] 1 1 auto[7] 1 1 auto[9] 1 1 auto[10] 3 1 auto[11] 1 1 auto[13] 1 1 ==================================================== ==================================================== Group Instance : cov[0] ==================================================== Score Weight Goal 50.00 1 100 Group: test::coverage_cumulative_off::something ---------------- Score Instances Weight Goal 87.50 50.00 1 100 ==================================================== Samples for Group Instance : cov[0] Variable Expected Covered Percent Goal Weight Total 16 8 50.00 value 16 8 50.00 100 1 ==================================================== Summary for variable value Expected Covered Percent Automatically Generated Bins 16 8 50.00 Automatically Generated Bins for value Uncovered bins name count at least [auto[0]] 0 1 [auto[3]] 0 1 [auto[5]] 0 1 [auto[7] - auto[11]] -- -- (5 bins) Covered bins name count at least auto[1] 1 1 auto[2] 1 1 auto[4] 1 1 auto[6] 2 1 auto[12] 1 1 auto[13] 1 1 auto[14] 1 1 auto[15] 2 1

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