What are the key differentiators of MIPI A-PHY?

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.

Why is a standardized SerDes specification needed for automotive applications?

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. 

What is an automotive SerDes?

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.

What is MIPI A-PHY?

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.

A-PHY offers: