Issuing Write Transactions - 3.0 English

AXI Traffic Generator LogiCORE IP Product Guide (PG125)

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3.0 English

For writes, each CMD is read from the CMDRAM and pushed to the 2-deep Maw_fifo and Maw_fifow. Maw_fifo is connected to the AXI_M AW signals and drives the request to the switch. Maw_fifow holds two requests heading to the Maw_agen block which generates addresses into the MSTRAM. Data read from MSTRAM is pushed into the Mw_fifo, which is connected to the AXI_M W signals.

To return BRESP out of order, Maw_agen feeds into Maw_track which tracks up to four IDs in a similar way to Mar_track. A write ID is assigned to an Mw_fifo0 to 3. When that ID receives a BRESP, it pops the corresponding Mw_fifo0 to 3. This allows the master write logic to handle receiving BRESPs out of order.