UPF Cluster AXI Structured Ports

[Lore0599]

Structured to Flattened AXI Ports

This PR modifies the cluster interface to use flattened AXI ports instead of the classic structured types defined in axi/typedef.sv. The reason for this change is to address limitations introduced by the UPF standard, as supported by QuestaSim. Specifically, when isolation strategies are applied, UPF cannot handle ports with "complex" types, such as AXI ports, which are structured. To resolve this issue, signals are flattened at the interface of each power domain and then internally reassigned to new structured signals, which can be propagated to downstream modules.

ADDED - HW

Flattened types

These types are defined for the flattened ports at the _chimeracluster interface and must not be overwritten:

• narrow_in_resp_flat_t
• narrow_out_req_flat_t
• wide_out_req_flat_t

Flattened ports

These flattened ports have been introduced at the _chimeracluster interface and must be connected upstream:

• narrow_in_resp_flat_o
• narrow_out_req_flat_o
• wide_out_req_flat_o

Structured internal signals

These internal structured signals are connected to the flattened ports upstream and to the downstream modules:

• narrow_out_req_s
• narrow_in_resp_s
• wide_out_req_s;