MIPI A-PHY PALs
MIPI A-PHY Protocol Adaptation Layers
General Info
MIPI Protocol Adaptation Layer (PAL) specifications define the flows and mechanisms for various widely adopted higher-layer protocols to be carried across the MIPI A-PHY long-reach serializer-deserializer (SerDes) physical layer interface for automotive applications. MIPI PALs define the adaptations necessary to carry proven MIPI and approved third-party protocols over a MIPI A-PHY link to connect cameras and displays to their associated electronic control units (ECUs).
The MIPI PALs map those approved higher-layer protocols to MIPI A-PHY's A-Packet format, acting as a conduit to and from A-PHY’s generic data link layer. In this way, the PALs enable the higher-layer protocols to operate seamlessly over MIPI A-PHY physical links.
MIPI PALs are available to MIPI Alliance members. For information about becoming a member, see Join MIPI.
MIPI Protocol Adaptation Layers
MIPI is developing multiple PAL specifications to simplify the integration of A-PHY to a variety of upper-layer protocols.
PALs are now available for I²C (Inter-Integrated Circuit), GPIO (General Purpose Input/Output), MIPI Camera Serial Interface (CSI-2®), MIPI Display Serial Interface (DSI-2℠), SPI (Serial Peripheral Interface) and the Video Electronics Standards Association (VESA®) Embedded DisplayPort and DisplayPort™ standards.
A PAL for carrying up to 100Mbps Ethernet traffic over an A-PHY v1.1 network for command and control of peripherals was released in 2022.
Current PALs:
- MIPI PAL™/CSI-2®
- MIPI PAL™/DSI-2™
- MIPI PAL™/eDP-DP
- MIPI PAL™/ETH
- MIPI PAL™/GPIO
- MIPI PAL™/I²C
- MIPI PAL™/SPI
Diagrams and Tables
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