Mipi D - Phy 20 Specification Top
MIPI D-PHY v2.0
The specification, released in March 2016, represents a significant leap in data throughput and physical layer efficiency for mobile and automotive applications. It serves as the high-speed serial interface backbone for camera (CSI-2) and display (DSI-2) protocols, balancing the intensive bandwidth requirements of high-resolution imaging with the strict power constraints of portable devices. High-Speed Performance and Throughput
From a hardware perspective, the D-PHY v2.0 is comprised of three distinct blocks: mipi d phy 20 specification top
- D-PHY v2.0: Uses dedicated clock and data lanes (DDR). Best for high-resolution static displays and RAW image sensors.
- C-PHY: Uses an embedded clock via 3-wire trios (5Gbps per trio). Best for reducing pin count.
2. The Low-Power (LP) Mode:
This is where the spec truly shines. By switching to single-ended, rail-to-rail signaling at lower speeds, the PHY maintains a control link without the power overhead of high-speed SerDes. This "parked" state capability is why modern devices can sit in "always-on" display modes or listen for voice commands without draining power. MIPI D-PHY v2
The MIPI D-PHY 2.0 specification defines a digital PHY (physical layer) that enables high-speed data transmission between a transmitter (e.g., a camera or display) and a receiver (e.g., a processor or a display controller). The specification supports a wide range of data rates, from a few hundred Mbps to several Gbps. D-PHY v2
- Low-speed (LS) mode: up to 400 Mbps (megabits per second)
- High-speed (HS) mode: up to 24 Gbps
For a pass at v2.0 compliance, the eye height must be > 80mV and eye width > 0.35 UI (Unit Interval). At 4.5 Gbps, one UI is roughly 222 picoseconds. This is an extremely tight mask, requiring low-loss PCB materials (Megtron 6 or better) for long traces.