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FabianL's avatar
FabianL
Icon for Occasional Contributor rankOccasional Contributor
25 days ago
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Avalon Transaction Responses & Bridges

Hello I have a question about the behavior of Avalon-MM Pipeline Bridges concerning the response signals. I have the following setup: 2 (or more) Avalon-MM Masters Master cmd_ctrl (supports Aval...
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  • ShengN_altera's avatar
    ShengN_altera
    19 days ago

    That was the reason, why we tried the response interface. I also expected the response codes to be propagated back to the master. But when I understand you correct, the Avalon response only works on a single interconnect and is not useable across bridges ist that correct?

    Yes, your understanding is correct.

     

    Can you don't use the bridge? Master get the response from slave?

ShengN_altera's avatar
ShengN_altera
Icon for Super Contributor rankSuper Contributor
19 days ago

That was the reason, why we tried the response interface. I also expected the response codes to be propagated back to the master. But when I understand you correct, the Avalon response only works on a single interconnect and is not useable across bridges ist that correct?

Yes, your understanding is correct.

 

Can you don't use the bridge? Master get the response from slave?

FabianL's avatar
FabianL
Icon for Occasional Contributor rankOccasional Contributor
19 days ago

In parts of the design this is an option. But the relevant parts are in a QSYS subsystem, which requires a bridge to have a single Avalon Slave port at the interface. Otherwise all Avalon-MM Slave Ports of the subsystem are exported individually, causing a real mess in the interface (we are talking about 5-10+ slave ports).

 

So I guess we have to implement a independent handshaking mechanism on top of Avalon.

Thanks for your explanations.