When in Shared Access mode, the N-to-M use case of the AXI Interconnect core provides for only one outstanding transaction at a time (single issuing), as shown in This Figure. For each connected master, read transaction requests always take priority over writes. The arbiter then selects from among the requesting masters.
A write or read data transfer is then enabled to the targeted slave device. After the data transfer (including the write response) completes, the next request is arbitrated. Shared Access mode minimizes the resources used to implement the crossbar module of the Interconnect.
Shared Access mode is available when AXI Crossbar is configured for any AXI protocol, but is always used when configured as AXI4-Lite.
