Aligned Strobe - 7.2 English

AXI 1G/2.5G Ethernet Subsystem Product Guide (PG138)

Document ID
PG138
Release Date
2023-11-15
Version
7.2 English

A write strobe is used for each byte (*_tkeep(3:0)) in the data bus (Four write strobes in our case). Null strobes are not allowed in the middle of a transfer, or at the end of a transfer. This means that the word transferred and every additional word up until the last must contain a valid 32-bit value. The last word might be sparse which means it might contain 4, 3, 2, or 1 valid bytes aligned to the right and the write strobes are used to indicate which bytes are valid. *_tlast is used to indicate the last data of a frame. In some cases, the write strobe signals can be tied to the active state (1) (see Transmit AXI4-Stream Interface).