[TEJ]

I have few more queries on AXI4 write transactions. For your information, I am not using AXI transaction IDs (AWID, ARID, RID, BID) in my design. According to my understanding of AXI4 specification, I have following queries:

1. It is possible to get Write Data on Write Data Channel from AXI4 Master before it's corresponding Write Address on Write Address channel. Is it correct or not?

2. As I am not using AXI transaction IDs, Is it possible that AXI4 master can send multiple Write Addresses prior to sending corresponding write data for those addresses?

3. Is it possible to get second burst of write data on write data channel from AXI4 Master even before response for first burst of write data has not been sent to AXI4 Master by AXI4 Slave?

Thanks & Regards,

Tejas

[mharnisch]

引用框（TEJ ＠ 23 April 2012 - 07:14 AM）

1. It is possible to get Write Data on Write Data Channel from AXI4 Master before it's corresponding Write Address on Write Address channel. Is it correct or not?

Yes.

引用

2. As I am not using AXI transaction IDs, Is it possible that AXI4 master can send multiple Write Addresses prior to sending corresponding write data for those addresses?

Yes, provided that ordering restrictions are obeyed.

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3. Is it possible to get second burst of write data on write data channel from AXI4 Master even before response for first burst of write data has not been sent to AXI4 Master by AXI4 Slave?

Yes. Like above, transfers from transactions w/o IDs (or the same ID) must occur in order, but they can still overlap. Since the transaction lengths are known, the slave can associate transfers to a particular transaction.

Regards
Marcus

[TEJ]

Thanks for your quick reply. I was expecting the same answer according to my understanding. I just need to confirm with someone who have worked on it. Thanks again.