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  • Any use case where we should be creating a new transaction(using factory create) for every iteration in a sequence?

Any use case where we should be creating a new transaction(using factory create) for every iteration in a sequence?

UVM 6661
#uvm 278 uvm sequence item 7 #randomization 11 #uvm #factory 11
sj1992
sj1992
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47 posts
May 01, 2019 at 10:27 pm

Hi,

Can someone provide me an example where we should be creating a new transaction(using factory create) for every iteration in a sequence?

I know that using the same object helps in terms of performance and since we will be randomizing the transaction for every iteration of a sequence I don't see the need to create a new transaction for every iteration.

Thanks

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tfitz
tfitz
Forum Moderator
467 posts
May 02, 2019 at 7:20 am

In reply to sj1992:

As long as one transaction completes before you need to start another one, then you can get away with just creating a single transaction/seq_item and reusing it on each pass through your loop. Just be aware that if you need to preserve the contents of the transaction in a monitor or scoreboard, then you must follow the MCOW rule (Guideline 10.1).

sj1992
sj1992
Full Access
47 posts
May 02, 2019 at 2:19 pm

In reply to tfitz:

Hi Tfitz,

Thanks for the info. As far as I know, the driver drives the I/F pins and calls item_done() which indicates the transaction is complete and the sequence then iterates through the loop and creates new seq item. In this case, the next transaction/seq_item is created only after the previous transaction/seq_item completes. Is there any example that you can provide in which a new transaction starts before the completion of the previous transaction?

Thanks.

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