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`uvm_do(), `uvm_create/`uvm_send vs sart_item/finish_item

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I've been using various types of calling uvm_sequences while developing sequences and every approach works. But I've a doubt what is the best one to be used when compared between using uvm_create, uvm_send and start_item, finish_item. In either cases the type and amount of control on the transactions is the same.

Can anyone help me in understanding the differences better?

Are there any guidelines to choose a specific style of coding for a given requirement?


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Hello Somasekhar,

UVM_Sequence has a body method and communication between driver and sequencer, so we must follow some steps as shown below.

1.create_item() / create req.

3.randomize the req.
4.send the req.
5.wait for item done.
6.get response(optional).

As per your question,

`uvm_do:- This macro takes seq_item or sequence as an argument. On calling `uvm_do() the above-defined 6 steps and start_item and finish_item will be executed.

`uvm_create:- This macro creates the item or sequence.

`uvm_send:- create() and randomize() are skipped, rest all other steps are  executed.

start_item():- Tells the sequencer that your sequence is available for arbitration by the sequencer. When it returns, your sequence should then set the variables in your sequence_item to the required values (i.e. by randomization or manual methods)

finish_item():-  when all the steps are executed in body method then call finish_item() to finish the transactions. 

Note : start_item() and finish_item() calls do not call pre or post_body().

Bhagwan Jha

Agnisys Inc.

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