Connection between multiple analysis port to single analysis import

UVM
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1

UVM explains that a single analysis port can be connected to multiple analysis imports/exports.
But is there any explanation when multiple analysis ports are connected to a single analysis imports/exports?

Thanks,

2

In reply to verif_learner:

There is nothing preventing multiple analysis ports from being connected to a single analysis export. But in most situations, the analysis export wants to know which port the transaction is coming from. Rather than having to set a field in the transaction object before writing it, and then having the subscriber check the field, it’s easier just to have separate connections to different exports.

3

In reply to dave_59:

Hi Dave,

I have a doubt here. If we have multiple analysis ports connected to a single analysis export, won’t there be a race condition if both the connected ports send transaction at the same time?
If yes, then we might lose transaction from one of the ports right?

Thanks,
Rajesh

4

In reply to rajesh_28:

That problem exists regardless of having a single export or separate exports into a component. A fifo(s) can be helpful in those cases.

5

Hi Dave,
Could you please help with my below query
What is that one specific thing enabling analysis port to connect to multiple analysis exports and restricting the tlm port to connect to one tlm export

Thanks & Regards

6

The TLM specification is the thing. There is a requirement that a TLM put() or get() port be connected to one implementation. When calling a get(), or put(), TLM guarantees that the operation has been completed when it returns.

An Analysis port scan be connected to zero or many implementations. Each connect stores an export implementation in an array. When calling write(), it iterates over the array calling each implementation The caller has no idea (and should not care) is any implementations got called.

7

I am trying to implement a single analysis export which is connected to multiple analysis ports. Is there an example which demonstrates the use of fifos for this scenario?