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notify() function in order to trigger event. It can be called with parameters as below.
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- notify() :Immediate notification
- notify(SC_ZERO_TIME) :Delta notification
- notify(double v, sc_time_unit tu) :Timed notification
- In fact, Delta notification is Timed notification with timed value is zero.
- When an event using Immediate notification, It is implied execution will be in the same delta-cycle(in Evaluate phase). Later, the Update phase will be called.
- When an event using Delta notification, It is will to wait until Update phase called. and allows other processes in the current delta-cycle to complete.
We use an example to clarify:
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void NOTIFY::monitor_signal_immediate_method() { printf("[%40s][%10s] reg value is 0x%08x.\n", __FUNCTION__, sc_time_stamp().to_string().c_str(), reg.read()); } void NOTIFY::monitor_signal_delta_method() { printf("[%40s][%10s] reg value is 0x%08x.\n", __FUNCTION__, sc_time_stamp().to_string().c_str(), reg.read()); } void NOTIFY::StartEventMethod() { reg.write(0x1F1F1F1F); e_start_delta.notify(SC_ZERO_TIME); e_start_immediate.notify(); } |
Output:
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[ NOTIFY::monitor_signal_immediate_method][ 5 ps] reg value is 0x00000000. [ NOTIFY::monitor_signal_delta_method][ 5 ps] reg value is 0x1F1F1F1F. |
When reg write value is 0x1F1F1F1F. The value will not update to reg until Update phase called. So, in monitor_signal_immediate_method ,the reg value still is 0x00000000 ( old value). And in monitor_signal_delta_method ,the reg value is 0x1F1F1F1F ( new value)
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