Protocol Stack Architecture
The UniPro protocol stack follows the classical OSI reference architecture (ref). For practical reasons, OSI's Physical Layer is split into two sub-layers: Layer 1 (the actual physical layer) and Layer 1.5 (the PHY Adapter layer) which abstracts from differences between alternative Layer 1 technologies.
| Layer # | Layer name | Functionality | Data unit name | |
|---|---|---|---|---|
| LA | Application | Payload and transaction semantics | Message | |
| DME | ||||
| Layer 4 | Transport | Ports, multiplexing, flow control | Segment | |
| Layer 3 | Network | Addressing, routing | Packet | |
| Layer 2 | Data link | Single-hop reliability and priority-based arbitration | Frame | |
| Layer 1.5 | PHY adapter | Physical layer abstraction and multi-lane support | UniPro symbol | |
| Layer 1 | Physical layer (PHY) | Signaling, clocking, line encoding, power modes | PHY symbol | |
The UniPro specification itself covers Layers 1.5, 2, 3, 4 and the DME (Device Management Entity). The Application Layer (LA) is out of scope because different uses of UniPro will require different LA protocols. The Physical Layer (L1) is covered in separate MIPI specifications in order to allow the PHY to be reused by other (less generic) protocols if needed.
Note that OSI Layers 5 (Session) and 6 (Presentation) are, where applicable, counted as part of the Application Layer.
The various layers and their features are described in more detail on a dedicated Wikipedia page.
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