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  • How analysis port write method handles the write method when there is a packet from multiple interfaces written simultaneously ?

How analysis port write method handles the write method when there is a packet from multiple interfaces written simultaneously ?

OVM 2521
prashanth.billava
prashanth.billava
Full Access
24 posts
September 12, 2016 at 1:38 am

Hi Team,

I am creating the packet out of one interface and sending it over analysis port write method. Example code is shown below.

class collector extends ovm_monitor;
 
  ovm_analysis_port #( trans_item ) trk_port;
 
  `ovm_component_utils_begin(collector)
 
  // Methods 
  extern function new (string name = "collector", ovm_component parent = null);
  extern function void build();
  extern task run();
  extern task collect_trans_1();
  extern task collect_trans_2();
 
endclass: collector
 
//Only relevant code is shown below.
task collector::run();    
    fork
        collect_trans_1();
        collect_trans_2(); 
    join_none
endtask : run
 
task collector::collect_trans_1()
  trans_item trans_item_1;
  trans_item_1.data = interface1.data;
  trans_item_1.address = interface1.address;
  trk_port.write(trans_item_1);
endtask: collect_trans_1 
 
task collector::collect_trans_2()
  trans_item trans_item_2;
  trans_item_2.data = interface2.data;
  trans_item_2.address = interface2.address;
  trk_port.write(trans_item_2);
endtask: collect_trans_2

Even though both the interfaces are different, I am creating the packet of same type (trans_item) out of it and sending it over analysis_port. This is working fine so far.

Now my question is, If I receive the transaction simultaneously on the bother the interfaces (interface1 and interface2), will
my analysis port (trk_port) be able to handle it?

Could someone kindly explain.

Thanks in advance

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Solution

Solution

dave_59
dave_59
Forum Moderator
10909 posts
September 12, 2016 at 5:07 pm

In reply to prashanth.billava:
The code that you show does not construct a trans_item or what the write() method does that is on the other side of the analysis port. So there is no way to know what problems there may be.

— Dave Rich, Verification Architect, Siemens EDA

kddholak
kddholak
Full Access
104 posts
September 12, 2016 at 5:48 pm

In above code , class collector has one analysis port so collector should have one write method. On the one write method, sends trans_item1 and trans_item2. How are the port connected other end ?

prashanth.billava
prashanth.billava
Full Access
24 posts
September 15, 2016 at 3:47 am

In reply to dave_59:

Hi Dave,

I have missed to add the construction part. Thanks for pointing it out (Assume that it is there)

And top level code looks like this: (ignore if there is any typo)

class soc_env extends ovm_component;
 
    // Instantiate collector and tracker
    collector                   m_collector;
    tracker                     m_tracker;
 
    // Factory registration
    `ovm_component_utils(soc_env)
 
    // Methods 
    extern function         new(string name = "soc_env", ovm_component parent = null);
    extern function void    build();
    extern function void    connect();
    extern task run(); 
 
endclass : soc_env
 
//Only relevant methods are shown
function void soc_env::connect();
    super.connect();
    // collector analysis port connected to tracker analysis export  
    m_collector.trk_port.connect(m_tracker.txn_port_imp.analysis_export);
endfunction
 
// Tracker component looks like this. 
 
class tracker extends ovm_monitor;
 
    // Factory registration
    `ovm_component_utils(tracker)
 
    // Ports  
    tlm_analysis_fifo #( trans_item )  txn_port_imp;
 
    // Methods
    extern function new(string name = "tracker", ovm_component parent = null);
    extern function void build();
    extern task run(); 
    extern task track_txn();
 
endclass : tracker
 
task tracker::run();
    super.run();
    fork
      track_txn();
    join_none  
endtask // run
 
task tracker::track_txn();
    trans_item transaction_item;  
    forever begin
        txn_port_imp.get(transaction_item); 
        // I will work on this item here to print in table format
 
    end
endtask

In tracker I am just getting the item and just displaying in the tracker format.
Now my query is, if i receive the transactions simultaneously on both the interface (interface1 and interface2) at collector side, do I face any issues while getting the item at tracker side?
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