Getting a deprecated wait warning in SystemC even though I'm using the right type of wait.

[Yasmin]

So, I modified a simple MAC design to use TLM FIFOs instead of SC Signals. I'm using clocked threads for the concurrent methods. For some reason, SystemC thinks I'm using the wrong form of wait, as evidenced by the warning message:

Info: (I804) /IEEE_Std_1666/deprecated: all waits except wait() and wait(N)
             are deprecated for SC_CTHREAD, use an SC_THREAD instead

I don't understand why this is the case. If you grep for "wait" over my code files, you'll see that I'm using the wait() method, as advised:

$ grep -n wait *.h *.cpp
mac.h:32:                       wait();
mac_tb.h:34:                    wait();
mac_tb.h:56:                    wait();

Am I doing something wrong here? Is there a fix for this?

I've attached the design to this forum post.

mac_sc_cthread.zip

 

[Andy Goodrich]

TLM interfaces use waits on events, e.g.:

template <typename T>

inline

void

tlm_fifo<T>::put( const T& val_ )

{

    while( is_full() ) {

      wait( m_data_read_event );

    }

    .  .  .

}

So you cannot use a TLM interface with an SC_CTHREAD, you need an SC_THREAD as the diagnostic states.  If you need to wait on an sc_clock in an SC_THREAD change your

       wait();

to wait on the positive edge of the clock. For instance, if your input port (sc_in<bool>) for the clock is called clk:

       wait( clk.posedge_event() ) 

 

 

[Yasmin]

@Andy Goodrich Okay, that makes sense. I'm aware of how to use SC_THREADs but I didn't know that TLM fifos were incompatible with clocked threads. Thank you for the help.