fixed burst in AXI

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abdelaali

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Hey all,
I'd like to know if data changes for a fixed burst in AXI in contrary of address ?
Any help will be much appreciated
 

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Fixed burst is for a fixed address for the entire data of AXI fixed burst.
 

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Yes same address for entire burst. But can data change from one beat to another
exmaple
Fixed burst
Burst lengh 2
Data bus width 32
beat 1 : ABCD
beat 2 : 120F
 

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The address sent is the starting address, the address is auto-incremented by the slave and the data transfer beats have whatever data the master wants to send.

This is all explained in the Amba AXI spec. You might want to go download it from the ARM website.
 

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@ads-ee Your description is for when the AxBURST signal is set to INCR
if it is FIXED - then the address is fixed for every beat of the burst.
 

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abdelaali said:
Yes same address for entire burst. But can data change from one beat to another
exmaple
Fixed burst
Burst lengh 2
Data bus width 32
beat 1 : ABCD
beat 2 : 120F
Click to expand...
Yes, data can change from one beat to another.
 

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@abdelaali ,
Yes data can change, and I did not find any exception to this inside the AMBA AXI spec.
Excerpt:
Burst type
The AXI protocol defines three burst types:
Click to expand...


This burst type is used for repeated accesses to the same location such as when loading or emptying FIFO.
Click to expand...

You you mind explaing in details as to what type of interface you are targeting which the AXI encapsulates ?
 
Last edited:

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