EMC requirements vary by OEM. Some aim for minimal noise immunity, while others apply stringent requirements to protect their systems.
The two A-PHY performance profiles provide two noise immunity levels to accommodate this variance:
- Profile 1 (P1) has lower noise immunity, similar to other SerDes solutions, and is applicable for speed Gears 1 and 2 (and optional Gear 3).
- Profile 2 (P2) has very high noise immunity based on analysis of the expected noise level over a vehicle’s lifetime.
MIPI conducted multiple tests in an independent lab to evaluate how the noise levels and shielding affect degradation after mechanical stress and aging. The results helped in the evaluation of the different available technologies, and research continues as part of the A-PHY Working Group's activities.