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AXI 4 UPsizer Downsizer module's protocol checker Error with WSTRB?

Hi,

I have one AXI module. from upper side master is doing transaction W/R. for master data bus width is 256bits. transaction comes into module and module split that into 2.> bcoz lower side are two 128 bits databus width slaves. upperbits of data bus WDATA[255:128] goes to slave 1 and lowerbits of data bus WDATA[127:0] goes to slave 2. same for WSTRB[32:16] connected to slave 1 & WSTRB[15:0] connected to slave 2.

But in my unit level testing there are 3 protocol checkers. 1 for master and 2 for slave 1& 2. When master initiates the transaction it does not throw any error. but for slave it is throwing error : Write strobes must only be asserted for the correct byte lanes as determined from start address, transfer size and beat number.  

Question: how should wstrb & awaddr & awsize & awlen & awburst work for slave 1 and slave 2. as they are half the data bus width.  

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  • Can you list what the original 256-bit transaction and split 128-bit transactions appear as so that we can perhaps comment on what the protocol violation is ?

    Please include AWADDR, AWSIZE and AWLEN for each AW channel transfer, and then the WSTRB values for each data transfer in the write transaction.

    Does the protocol violation get flagged for EVERY 128-bit transfer, so just one ?

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  • Can you list what the original 256-bit transaction and split 128-bit transactions appear as so that we can perhaps comment on what the protocol violation is ?

    Please include AWADDR, AWSIZE and AWLEN for each AW channel transfer, and then the WSTRB values for each data transfer in the write transaction.

    Does the protocol violation get flagged for EVERY 128-bit transfer, so just one ?

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