What are the LVDS interfaces?

 

The interfaces widely used in automotive LVDS video data transmission are GMSL and FPD-Link, which convert multiple parallel data (including video, control, voice, etc.) on the transmitter side to a single serial data, and then convert the serial data on the receiver to a parallel video format and low-speed control signals that can be received by the display panel or the SoC to ensure stable and long-distance data transmission between the camera, the monitor and the processor. The serial data is then converted back into parallel video format and low-speed control signals that can be received by the display panel or SoC at the receiving end, thus ensuring stable long-distance data transmission between the Camera, Monitor and processor.

 

Maxim's GMSL interface supports the following multiple functions:

1. Video and GbE support. With GMSL technology, HD video and high-speed Ethernet data transmission can be integrated to simplify in-vehicle layout wiring and make system design easier.

 

2. Multiple Video support. For multi-sensor fusion, with the video cut function, a serializer can be used to integrate multiple video data and feed them to different displays separately.

 

3. Support Camera 4-channel aggregation, in the surround view system, due to the video aggregation function, through the GMSL four-channel deserializer, it can support the transmission of four cameras at the same time, which greatly save the trouble of the system layout wiring and the design cost of FPGA.

 

About Ti’s FPD-Link interface

FPD-LINK, full name is Flat Panel Display Link, is Texas Instruments implementation of high-speed data transmission interface standard, FPD-Link program is divided into FPD-Link I, FPD-Link II, FPD-Link III. Currently the mainstream is FPD-Link III, which is incompatible with the previous FPD-Link I and FPD-Link II.

The maximum bandwidth of the FPD-Link III camera can reach 4.16Gbps, which can transmit uncompressed images of 4M@30fps; the display can support up to 2K/60Hz/24bpp. TI’s FPD-Link can support HDMI, MIPI DSI input, and support LVDS/MIPI DSI output.

TI’s FPD-Link in addition to the ability to complete the transmission of video data, it also has some other features:

1. POC (Power Over Cable)

As the video data is scramble encoded, leaving the low frequency band empty, the system can utilize the DC band of the video transmission harness to supply power to the remote camera, simplifying the power cable design of the remote camera of the ADAS system.

2. Bi-directional control signal transmission

Similar to the POC principle, FPD Link devices can utilize idle time slots in the video transmission to bi-directionally transmit control signals, enabling things such as register access, software configuration, display backlight control, touch screen interrupt, and position information upload from the remote device.

3. Integrated signal conditioning technology

In some application scenarios, the distance between the video source and the receiving end is relatively far, the wire harness is long, and the signal attenuation is large. Deserializers are integrated with high-speed signal conditioning technology (Signal Conditioner), such as Adaptive Equalizer, CDR and other modules, used to extend the transmission distance of the video.

4. Support for multiple video harnesses

TI’s FPD-Link supports high-speed differential harness (HSD) and coaxial cable. Flexible video harness options make FPD-Link suitable for a variety of application scenarios, as shown in the figure below:

Original link of this blog is: https://blog.csdn.net/wpgddt/article/details/136932630

 

CandidTech has 20 Years experience specialized in OEM Vehicle Cameras, Dash Camera, 360 AVM Solution, ADAS Electronics and the likes. Continuously supplying product to domestic and international Fortune 500 automakers like Volkswagen, Toyota, Nissan, Paccar etc.