Yes. MIPI A-PHY supports approved third-party protocols. For instance, as part of this effort, protocol adaptation layers (PALs) have been released for VESA’s DisplayPort and Embedded DisplayPort standards (VESA DP and eDP), as well as for I2C and GPIO. Additional PALs are scheduled to be developed for Ethernet and I3C.
Yes. MIPI A-PHY is the only long-reach SerDes standard to support CSI-2 and DSI-2. All available MIPI CSI-2 and DSI-2 versions are supported via protocol adaptation layers (PAL/CSI-2 and PAL/DSI-2).
The primary benefits of A-PHY are:
- A-PHY supports long cable lengths and a high data rate.
- A-PHY has enhanced noise immunity.
- A-PHY has an ultra-low packet error rate < 10-19.
- A-PHY has higher than a 90% net data rate.
- A-PHY can be fully implemented in hardware -- no software stack is required as in some solutions.
- Designed for use with widely implemented protocols and interfaces.
- A-PHY is the first asymmetric industry-standard solution. Most other solutions are proprietary.
Prior to the release of MIPI A-PHY, the industry did not have a standard for a long- reach SerDes with the performance, noise immunity and reliability to cover long-distance, high-speed sensor and display links. Sensor links are particularly susceptible to electromagnetic interference, data loss and latency as link bandwidth and distance increase. As such, there is a need for a standard that meets stringent EMC requirements and offers stricter testing to guarantee proper performance and high resilience.
A serializer/deserializer converts parallel data to serial data (and vice-versa) for fast communication between devices using lower cost cables and connectors. As data rates and speeds increase, SerDes designs become increasingly complex, especially when designing to meet automotive reliability, quality, aging and functional safety requirements.
MIPI A-PHY (originally released to members in September 2020) is the first standardized, asymmetric, long-reach serializer-deserializer (SerDes) physical layer specification targeted for advanced driver-assistance systems (ADAS), autonomous driving systems (ADS), in-vehicle infotainment (IVI) displays and other surround-sensor applications (e.g., cameras, lidar, radar).
A-PHY's primary mission is to transfer high-speed data between cameras and displays and their related ECUs.