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Altera_Forum's avatar
Altera_Forum
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15 years ago

AValon Bus Property "maxBurstsize"

I have to map my custom logic, which is a ddr controller with the Nios Proc via Avalon MM bus interface. So, I was reading Avalon bus specs. I found two similar things which confused me. 1.) bu...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
15 years ago

burstcount is the actual signal that you will use to tell how many transfers the transaction will contain. you are wrong in saying it defines the width of the burst count signal, that is what maxBurstCount does. maxBurstCount is a constant and is what the maximum value burstcount can contain.

So, for example :

if maxBurstCount is set to 2, then burstcount will have a width of 2 and can contain the values 1 or 2. if maxBurstCount is set to 4, the burstcount will have a width of 3 and can contain the value 1,2,3,4. I don't think you can have a burstcount of 0, but it is possible i guess.

So in recap:

burstcount is a signal and maxBurstCount is a constant that defines the width of burstcount

Probably not the best definition/explination, but hope this helps.