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  • uvm_event trigger() and reset()

uvm_event trigger() and reset()

UVM 5517
#UVM #uvm_event #uvm... 2 #eventtrigger 1 #eventreset 1
Michael54
Michael54
Full Access
32 posts
November 19, 2020 at 4:13 am

Hi,

I have a code triggering an uvm_event and right after it resets this event, inside a function.
What is achieved by this trigger() + reset() right after?
Will the waiting process detect this event occurrence? 

function void IRQReturn(input string a_irq_name, ref uvm_object a_obj);
    uvm_event    _irq_ev;
    int          _status;
 
    _irq_ev = ev_pool.get(a_irq_name);
 
    if (a_obj != null) begin
        _status = isr_mbx[a_irq_name].try_put(a_obj);
    end
 
    _irq_ev.trigger();
    _irq_ev.reset();
    `uvm_info(get_type_name(), $sformatf("Trigger_event for IRQ_name: %s", a_irq_name), UVM_HIGH)
 
endfunction : IRQReturn

Thanks,
Michael

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chr_sue
chr_sue
Full Access
3213 posts
November 19, 2020 at 7:23 am

In reply to Michael54:

_irq_ev.trigger();
sets the trigger to 'on', trigger_time = actual time, num_waiters to the actual waiting processes.
_irq_ev.reset();
resets the trigger, setting the trigger to 'off', num_waiters = 0, trigger_time = 0.

Michael54
Michael54
Full Access
32 posts
November 19, 2020 at 8:59 am

In reply to chr_sue:

Quote:
In reply to Michael54:

_irq_ev.trigger();
sets the trigger to 'on', trigger_time = actual time, num_waiters to the actual waiting processes.
_irq_ev.reset();
resets the trigger, setting the trigger to 'off', num_waiters = 0, trigger_time = 0.

Thank you for the replay :)

Will these 2 lines of code as written one after the other:

_irq_ev.trigger();
_irq_ev.reset();

prevent from the other processes waiting for the event trigger keep waiting forever?
chr_sue
chr_sue
Full Access
3213 posts
November 19, 2020 at 9:44 am

In reply to Michael54:

If you do not trigger again no trigger will happen and processes waiting for a triger are waiting forever. The reset is switching off the trigger and set the num_waiters = 0; There is nobody waiting even if additional processes are waiting.

UVM_SV_101
UVM_SV_101
Full Access
50 posts
December 02, 2020 at 12:15 pm

In reply to Michael54:
I think what you are trying to answer is if two events _irq_ev.trigger(); followed by _irq_ev.reset(); would work, considering they are right after one another.

Answer is Yes. _irq_ev.trigger() will be detected by the event in waiting for this event to trigger and then the reset will happen

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