2.2.5. PLL and SSM Segment
The end NoC segment for each hard memory NoC contains the NoC PLL and the NoC subsystem manager (SSM). The NoC PLL generates the clocking for the hard memory NoC. The NoC SSM connects to a service network to configure the hard memory NoC and to read status registers for observability and debug purposes. The NoC SSM uses a non-user accessible AXI4 Lite initiator to connect to the service network.
The NoC SSM segment provides a transparent bridge between the hard memory NoC and service network. This bridge enables fabric AXI4 initiators to access AXI4 Lite targets.