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  • How driver will request each time to sequencer or sequence need different sequence_item on same interface

How driver will request each time to sequencer or sequence need different sequence_item on same interface

UVM 6758
#uvm 278 #systemverilog 102
Subbi Reddy
Subbi Reddy
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92 posts
October 14, 2020 at 12:31 am

How driver will request each time to sequencer or sequence need different sequence_item on same interface

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chr_sue
chr_sue
Full Access
3903 posts
October 14, 2020 at 1:32 am

In reply to Subbi Reddy:

Could you please explain what you mean.
The driver gets each time it is doing a get or get_next_item a different seq_item.

Subbi Reddy
Subbi Reddy
Full Access
92 posts
October 15, 2020 at 4:12 am

Yes, each time driver gets different sequence_item

chr_sue
chr_sue
Full Access
3903 posts
October 15, 2020 at 5:05 am

In reply to Subbi Reddy:

And what is your question?

Subbi Reddy
Subbi Reddy
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92 posts
October 16, 2020 at 5:29 am

class driver extends uvm_driver#(my_data)
Ex: my_data packet is parameterized when developing the driver code, suppose at the middle of the transactions driver need to get my_data_eth packet, How it will change sequence_item(belongs to either same sequence or different sequence)??

chr_sue
chr_sue
Full Access
3903 posts
October 16, 2020 at 6:35 am

In reply to Subbi Reddy:

Your driver is parameterized for the seq:item type my_data. When performing in the driver get_next_item ot get you get an object of this seq_item type. The objects you are retrieving have always different dat. The sequence which is generating the seq_items has to be parameterized with the sam seq_item type as the driver class.
class my_sequence extends uvm_sequence #(my_data);

Subbi Reddy
Subbi Reddy
Full Access
92 posts
November 25, 2020 at 11:22 pm

In reply to chr_sue:
can we get different sequence_item Without parameterized??

Solution

Solution

chr_sue
chr_sue
Full Access
3903 posts
November 25, 2020 at 11:47 pm

In reply to Subbi Reddy:

You have a sequencer/driver pair as a one-to-one connection.
To generate seq_items you have to define a seq_item class. Additionally you have to provide a sequence which defines how the seq_items will be generated. The sequencer generates the seq_items and the driver pulls them. It is not possible and it makes no senses to generate different seq_item types from a sequence.

Subbi Reddy
Subbi Reddy
Full Access
92 posts
November 26, 2020 at 12:01 am

In reply to chr_sue:

Thank you

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