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Hi, I have a doubt about requirement of raise/drop_objection. Why does a compiler need objections in run_phase? Why can it not just wait for time given like 100ns as following example? Ex. task run_phase(uvm_phase phase); //phase.raise_objection(this); #100ns; //phase.drop_objection(this); endtask

I am trying to run a couple of test cases using script.But I am getting an error message after running the first test case.This stops the simulation.I am attaching the LOG with this mail.I don't understand why this is happening. I checked previous posts and added +UVM_OBJECTION_TRACE in the vsim command.But I am not able to find out the cause of the error.Can anybody help me?? # UVM_INFO @ 0: run [OBJTN_TRC] Object uvm_test_top raised 1 objection(s): count=1 total=1 # UVM_INFO @ 0: run [OBJTN_TRC] Object uvm_top added 1 objection(s) to its total (raised from source object uvm_test_top): count=0 total=1 # AT TIME=0,APB MASTER IN RESET MODE # AT TIME=1200000,APB MASTER IN ACTIVE MODE # AT TIME=45400000,*************************** EXPECTED_DATA=1792474624,RECEIVED DATA=1792474624 # AT TIME=186600000,*************************** EXPECTED_DATA=222,RECEIVED DATA=222 # AT TIME=231800000,*************************** EXPECTED_DATA=1504340502,RECEIVED DATA=1504340502 # AT TIME=349000000,*************************** EXPECTED_DATA=2367782205,RECEIVED DATA=2367782205 # UVM_INFO Test_Cases/my_test.sv(40) @ 349000000: uvm_test_top [root objections] # The total objection count is 1 # --------------------------------------------------------- # Source Total # Count Count Object # --------------------------------------------------------- # 0 1 uvm_top # 1 1 uvm_test_top # --------------------------------------------------------- # # UVM_INFO Test_Cases/my_test.sv(43) @ 349000000: uvm_test_top [my_component objections] # The total objection count is 1 # --------------------------------------------------------- # Source Total # Count Count Object # --------------------------------------------------------- # 1 1 uvm_test_top # --------------------------------------------------------- # # UVM_INFO @ 349000000: run [OBJTN_TRC] Object uvm_test_top dropped 1 objection(s): count=0 total=0 # UVM_INFO @ 349000000: run [OBJTN_TRC] Object uvm_test_top all_dropped 1 objection(s): count=0 total=0 # UVM_INFO @ 349000000: run [OBJTN_TRC] Object uvm_top subtracted 1 objection(s) from its total (dropped from source object uvm_test_top): count=0 total=0 # UVM_INFO @ 349000000: run [OBJTN_TRC] Object uvm_top subtracted 1 objection(s) from its total (all_dropped from source object uvm_test_top): count=0 total=0 # UVM_INFO verilog_src/uvm-1.1d/src/base/uvm_objection.svh(1268) @ 349000000: reporter [TEST_DONE] 'run' phase is ready to proceed to the 'extract' phase # # --- UVM Report Summary --- # # ** Report counts by severity # UVM_INFO : 12 # UVM_WARNING : 0 # UVM_ERROR : 0 # UVM_FATAL : 0 # ** Report counts by id # [OBJTN_TRC] 6 # [Questa UVM] 2 # [RNTST] 1 # [TEST_DONE] 1 # [my_component objections] 1 # [root objections] 1 # ** Note: $finish : C:/questasim_10.2c/win32/../verilog_src/uvm-1.1d/src/base/uvm_root.svh(430) # Time: 349 us Iteration: 68 Instance: /my_top # 1 # Break in Task uvm_pkg/uvm_root::run_test at C:/questasim_10.2c/win32/../verilog_src/uvm-1.1d/src/base/uvm_root.svh line 430 # Simulation Breakpoint: 1 # Break in Task uvm_pkg/uvm_root::run_test at C:/questasim_10.2c/win32/../verilog_src/uvm-1.1d/src/base/uvm_root.svh line 430 # MACRO ./run_do PAUSED at line 18

Hello, I was wondering if anyone had any ideas on why my test is hanging at the end of the run phase and how to resolve it correctly. The last of the output is listed below. The testbench has a series of agents, each including a monitor, producer driver, consumer driver, and scoreboard. At the end of the run phase when the test is hanging I'm able to step through code and see it's executing in a forever loop in the monitor and consumer driver. In both of these I'm never raising any objection. Tracing through the UVM code it seems it's waiting for all threads to exit before moving on. Some questions: Why should it wait for threads to exit if they never raised any objection? Do I need to kill these threads? What is the best practice? thanks! UVM_INFO uvm_objection.svh(1245) @ 31166250: reporter [TEST_DONE] All end-of-test objections have been dropped. Calling stop tasks UVM_INFO uvm_objection.svh(1268) @ 31166250: reporter [TEST_DONE] 'run' phase is ready to proceed to the 'extract' phase UVM_INFO uvm_phase.svh(1199) @ 31166250: reporter [PH/TRC/EXE/ALLDROP] Phase 'common.run' (id=255) PHASE EXIT ALL_DROPPED