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This section describes the System Address Map overview.
All CHI commands must include a fully resolved network address, that is, the address must include a source and target ID. For originating requests, this is achieved by passing a request address through a System Address Map (SAM), which effectively maps a memory or I/O address to the target device to satisfy that request. Because this conversion must be complete for a request to be valid, the SAM functionality is integrated in each requesting device, and cannot exist as a separate in-network device.
The SAM consists of two logical units:
An RN-SAM in each RN to map from an address to HN-F, HN-I, and MN target IDs.
An HN-F SAM in the HN-F, that maps from an address to a Memory Controller (MC) target ID.
The RN-SAM functionality is integrated into RN devices and is not a separate CHI-based unit.