Industrial imaging applications continue to push camera requirements toward higher resolutions, faster frame rates, greater bit depths, and advanced sensor capabilities. This creates a corresponding demand for interfaces that can carry large volumes of image data from the sensor to the processing platform.
MIPI CSI-2 remains widely used by embedded processors. In contrast, several high-performance Sony industrial image sensors use SLVS-EC, or Scalable Low Voltage Signaling with Embedded Clock, for high-bandwidth image transmission.
The difference creates an integration challenge. A camera design may benefit from the imaging capabilities of an SLVS-EC sensor while the target embedded processor expects camera data through MIPI CSI-2. Bridging these two interfaces requires a conversion architecture capable of handling the sensor data stream and presenting it in a form the processor can receive.
In this blog, you’ll learn more about SLVS-EC, how FPGA-based conversion works, and e-con Systems’ implementation and engineering expertise.
What Is SLVS-EC?
SLVS-EC is a high-speed serial interface developed primarily by Sony for industrial CMOS image sensors. Unlike conventional SLVS, the clock is embedded within the serial data stream. This architecture supports high-speed transmission and scalable multi-lane operation while also helping with signal integrity, EMI control, and PCB routing.
Why Was SLVS-EC Developed?
Industrial image sensors have grown in resolution, frame rate, bit depth, HDR capability, and global shutter performance. Each increase raises the amount of data that must travel from the sensor into the processing pipeline.
SLVS-EC addresses this bandwidth requirement through a serial architecture designed for high-speed sensor output.
Sony offers several Pregius and Pregius S image sensors with SLVS-EC interfaces, including:
- IMX530
- IMX531
- IMX532
- IMX540
- IMX541
- IMX542
Why Isn’t SLVS-EC Commonly Used with Embedded SoCs?
Embedded processors from NVIDIA, Qualcomm, NXP, Texas Instruments, Renesas, and Intel commonly provide MIPI CSI-2 receiver interfaces for camera connectivity. SLVS-EC support at the processor side is far less common. As a result, an SLVS-EC image sensor generally requires an intermediate conversion stage before its image stream can reach a MIPI-based embedded SoC.
Integration challenges
- Protocol conversion is only one part of the integration challenge.
- The bridge must receive high-speed SLVS-EC data over multiple lanes, recover the embedded clock, align incoming data, and reconstruct the image stream.
- The reconstructed frames must then be converted into MIPI CSI-2 packets and transmitted to the embedded processor.
- Limited availability of dedicated SLVS-EC-to-MIPI bridge devices makes FPGA-based conversion a practical engineering approach.
How FPGA-Based SLVS-EC to MIPI CSI-2 Conversion Works
An FPGA placed between the image sensor and embedded processor handles the interface conversion. On the sensor side, the FPGA receives the SLVS-EC data stream and recovers the embedded clock. It then aligns data arriving through the SLVS-EC lanes and reconstructs the image frames.
Once the incoming frame has been reconstructed, the FPGA repackages the image data according to MIPI CSI-2 requirements. The resulting CSI-2 stream is then transmitted through the MIPI interface connected to the embedded processor.
What Is a Typical System Architecture?
The system architecture begins with a Sony image sensor transmitting image data through SLVS-EC. The FPGA bridge receives this stream and carries out the internal conversion stages, beginning with SLVS-EC reception, lane alignment, and clock recovery. Image data is reconstructed into frames before being converted into CSI-2 packets. The MIPI transmitter then sends the converted image stream to the CSI-2 receiver on the embedded SoC.
How Does e-con Systems Bridge SLVS-EC to Multiple MIPI CSI-2 Ports?
e-con Systems has developed an FPGA-based SLVS-EC to Multi-Port MIPI CSI-2 Bridge with a customized SoC driver for integrating Sony high-speed image sensors with MIPI-based embedded processors. The implementation uses Lattice CertusPro-NX FPGAs together within the bridge architecture. It also comes with and without DDR external memory.
High-resolution image sensors such as the Sony IMX410 can generate significantly higher data rates than a single MIPI CSI-2 interface can support. The IMX410 provides 6064 × 4040 RAW12 at up to 40 FPS, requiring approximately 11.75 Gbps of image bandwidth.
An 8-lane SLVS-EC interface can provide significantly higher bandwidth, but many embedded SoCs support only MIPI CSI-2 camera interfaces.
e-con Systems’ solution addresses this limitation by receiving the high-bandwidth SLVS-EC stream and distributing the image data across multiple 4-lane MIPI CSI-2 ports.
For example:
- Single MIPI 4-lane: ~9.2 Gbps → Insufficient
- Two MIPI 4-lane: ~18.4 Gbps → Sufficient
A customized SoC driver then reconstructs the partitioned image streams into a complete frame, enabling the SoC’s ISP and display pipeline to process the image normally.
Use Cases of SLVS-EC to MIPI CSI-2 Conversion
- Industrial automation
- Factory inspection
- Robotics
- Machine vision
- Medical imaging
- Scientific imaging
- Transportation systems
Ultimately, SLVS-EC offers excellent performance for high-speed industrial imaging. FPGA-based conversion to MIPI CSI-2 bridges the ecosystem gap and enables advanced Sony sensors to work with mainstream embedded processors.
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e-con Systems has been designing, developing, and manufacturing embedded vision solutions, from OEM cameras to complete ODM platforms, since 2003.
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FAQs
- What is SLVS-EC?
SLVS-EC is a high-speed serial interface developed primarily by Sony for industrial CMOS image sensors. It embeds the clock within the data stream and supports scalable multi-lane transmission.
- Why is an SLVS-EC to MIPI CSI-2 bridge required?
Many embedded processors use MIPI CSI-2 camera inputs, while several Sony Pregius and Pregius S sensors use SLVS-EC. The bridge converts the sensor output into a format the processor can receive.
- How does FPGA-based SLVS-EC to MIPI CSI-2 conversion work?
The FPGA receives the SLVS-EC stream, recovers the embedded clock, aligns the data lanes, reconstructs image frames, generates CSI-2 packets, and transmits them to the embedded SoC.
- Which applications use SLVS-EC to MIPI CSI-2 conversion?
Use cases include industrial automation, factory inspection, robotics, machine vision, medical imaging, scientific imaging, and transportation systems.
- How Does e-con Systems implement SLVS-EC to MIPI CSI-2 conversion?
e-con Systems has a developed an FPGA-based SLVS-EC to multi-port MIPI CSI-2 bridge to connect Sony high-speed image sensors with MIPI-based embedded processors. Its architecture combines Lattice CertusPro-NX FPGAs to distribute high-bandwidth image data through multiple MIPI CSI-2 ports. A customized SoC driver reconstructs the partitioned streams into a complete frame.
Prabu is the Chief Technology Officer and Head of Camera Products at e-con Systems, and comes with a rich experience of more than 15 years in the embedded vision space. He brings to the table a deep knowledge in USB cameras, embedded vision cameras, vision algorithms and FPGAs. He has built 50+ camera solutions spanning various domains such as medical, industrial, agriculture, retail, biometrics, and more. He also comes with expertise in device driver development and BSP development. Currently, Prabu’s focus is to build smart camera solutions that power new age AI based applications.