different between run_phase and other 12 runtime phase

[qinhailiang]

Hi, all

 

     i confused about the different between run_phase and other 12 runtime phase at bellow two case:

 

First Case:

 

task monitor::run_phase(uvm_phase pahse);

super.run_phase(phase);

#50;

`uvm_info("RUN_PHASE", "Monitor Run_phase Starting", UVM_NONE)

endtask

 

task driver::main_phase(uvm_phase pahse);

super.main_phase(phase);

phase.raise_objection(this);

#100;

`uvm_info("MAIN_PHASE", "Driver Main_phase Starting", UVM_NONE)

phase.drop_objection(this);

endtask

 

In the case, raise objection in driver‘s main_phase task, does not raise objection in the monitor's run_phase task

the run_phase and main_phase work as expected!

 

 

Second Case:

 

task monitor::run_phase(uvm_phase pahse);

super.run_phase(phase);

phase.raise_objection(this);

#100;

`uvm_info("RUN_PHASE", "Monitor Run_phase Starting", UVM_NONE)

phase.drop_objection(this);

endtask

 

 

task driver::main_phase(uvm_phase pahse);

super.main_phase(phase);

#50;

`uvm_info("MAIN_PHASE", "Driver Main_phase Starting", UVM_NONE)

endtask

 

In the case, raise objection in the monitor's run_phase task, does not raise objection in the driver’s main_phase task

The run_phase work expected, but the main_phase task in driver does not output any information, in other words, it seems like the main_phase task is not scheduled!

 

Who know the reason?

 

BR

 

QIN

[uwes]

hi,

 

there are a few things playing here

 

1. run_phase is parallel to all other runtime phases ((pre|post)_)?(reset|configure|main|shutdown)_phase

2. a phase is terminated when all predecessors of the next phase are completed

3. completed mean "they do NOT object phase progression"

 

for your example it means that main_phase is started but since you dont raise an objection its terminated instantly. then post_main_phase is started and so on. since only the run_phase objects progression all runtime phases end in zero time (apart from the last one which needs to wait till the parallel phase run_phase completes). that post_shutdown_phase and run_phase terminate and the joint successor phase extract_phase is started.

 

have a look at +UVM_PHASE_TRACE

 

/uwe

[qinhailiang]

Hi, UWE

 

     Thanks for your reply.

 

     I understand your explanation!

 

     thanks again.

 

Best Regards

 

QIN