When using the TCP/UDP checksum offload function, checksum information is passed between the software and the subsystem, using the AXI4-Stream Control and AXI4-Stream Status interfaces. These interfaces are described in AXI4-Stream Interface and the tables in this section show the checksum offload fields.The use of the TCP/ UDP checksum offload function requires that the AXI DMA is connected to the AXI Ethernet Subsystem through the AXI4-Stream Control and AXI4-Stream data interfaces.SeeMapping AXI DMA IP Buffer Descriptor Fields to AXI4-Stream Fields for more information.