Module axi_demux

Demultiplex one AXI4+ATOP slave port to multiple AXI4+ATOP master ports.

The AW and AR slave channels each have a select input to determine to which master port the

current request is sent. The select can, for example, be driven by an address decoding module

to map address ranges to different AXI slaves.

Design overview

Beats on the W channel are routed by demultiplexer according to the selection for the

corresponding AW beat. This relies on the AXI property that W bursts must be sent in the same

order as AW beats and beats from different W bursts may not be interleaved.

Beats on the B and R channel are multiplexed from the master ports to the slave port with

a round-robin arbitration tree.