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  • rsp_port and seq_item_port in UVM ?

rsp_port and seq_item_port in UVM ?

UVM 5686
Arun_Rajha
Arun_Rajha
Forum Access
42 posts
January 16, 2021 at 9:12 am 

Case 1:  
 
        seq_item_port.get_next_item(req);
 seq_item_port.item_done(rsp);       
 
…..             
 
…..                                                         // Drive transaction on the interface and sample response / read data
 
…..
 
rsp_port.write(rsp);                          // Sending the response sampled from the bus to the Sequencer in parallel
 
 
Case 2: 
 
             seq_item_port.get_next_item(req);  // Get the transaction packet from Sequencer
 
…..             
 
…..                                                            // Drive transaction on the interface and sample response / read data
 
…..
 
seq_item_port.item_done(rsp);        // Send the response packet to Sequencer

I want to send the response from Driver to the sequence back. Which of the above is best to be implemented and what is the difference.

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Solution

chr_sue
chr_sue
Full Access
3328 posts
January 16, 2021 at 10:37 am

In reply to Arun_Rajha:

You missed cas3:
seq_item_port.get(req);
....
seq_item_port.put(rsp);

Case 3 can be used in case of pipelined or out-of-order transactions.

In your case 1 you are sending the rsp back twice, i.e. with item_done(rsp) and through the rsp_port. Doing this is not a good idea.

Arun_Rajha
Arun_Rajha
Forum Access
42 posts
January 16, 2021 at 11:05 am

In reply to chr_sue:

Hi chr_sue,
Can you please give a scenario for Case 3.(may be with AHB in terms pipelined transactions)

chr_sue
chr_sue
Full Access
3328 posts
January 16, 2021 at 11:13 am

In reply to Arun_Rajha:

Please look here:
https://verificationacademy.com/cookbook/driver/pipelined

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