In simple terms, dedicated interface chips (ASSP) and FPGA implementation solutions are not in a “one or the other” competitive relationship, but rather a complementary relationship where each has its advantages and disadvantages in different scenarios. In the early stages of a new protocol release, when dedicated chips have not yet been mass-produced, FPGAs are the main force. Once dedicated chips are on the market, FPGAs serve as a supplement, playing a role in certain application scenarios.
Next, let’s break down the advantages and disadvantages of both:
Advantages and Limitations of Dedicated Video Interface Chips (ASSP)
Advantages:
Very low cost: For standard interfaces like HDMI Tx/Rx and DisplayPort, dedicated chips that are mass-produced can achieve very low costs due to high integration and large shipment volumes, possibly costing only one or two dollars or even less.
Plug and play: Chip manufacturers have already handled all the complex protocol processing, ESD protection, and PHY (physical layer) design, so you basically just need to connect the lines and configure I2C, making development easy and speeding up time to market.
Power optimization: Designed for specific functions, power consumption is usually lower than that of implementing general logic with FPGA.
Stable performance: After extensive market validation, compatibility and stability are usually well guaranteed.
Limitations:
Fixed functionality: This is the biggest limitation. The functionality of the chip is fixed at the factory. If you need a specific function or a small variant of a protocol, dedicated chips may not meet your needs.
Lack of flexibility: It typically can only implement one or a few fixed interface protocols. If your product needs to support multiple interfaces simultaneously (such as HDMI input and SDI output), you may need multiple chips, increasing PCB complexity and BOM costs.
Iteration lag: When new video standards (such as HDMI 2.2, DisplayPort 2.1) emerge, dedicated chips require a certain period from design to market. In contrast, FPGAs can support new standards more quickly by updating IP cores.
System integration: In complex systems, adding another chip means occupying more board area and adding another device that needs power and management.
Advantages and Significance of Implementing Video Interfaces with FPGA
Advantages:
Extremely high flexibility/customizability: This is the core value of FPGA. You can implement non-standard/private protocols, such as custom high-speed serial protocols commonly used in military, aerospace, and industrial testing fields.
Support for multiple protocol switching: A single FPGA can be programmed to simultaneously or time-share implement the transmission and reception functions of multiple interfaces such as HDMI, DisplayPort, SDI, and V-by-One, achieving an “All-in-One” interface solution.
Integrated preprocessing/postprocessing functions: You can perform real-time operations such as scaling, color space conversion (CSC), overlay, frame rate conversion (FRC), image enhancement, and split-screen while video data flows through the FPGA. This means you save an additional video processing chip, which dedicated interface chips absolutely cannot achieve.
Bridging functions: Implement conversions between different interface protocols, such as converting a MIPI CSI-2 camera interface to HDMI output, or converting DisplayPort to SDI.
System integration and simplification: In FPGA-based SoCs (such as Xilinx Zynq, Intel Cyclone V/V10), FPGA logic can be tightly integrated with ARM processors. Video interfaces can interact directly with processors through internal high-speed buses without the need for external physical interface chips, greatly simplifying board-level design and improving system reliability and performance.
Addressing the latest standards: For newly released video standards, FPGA manufacturers typically provide corresponding IP cores immediately. Using FPGA allows your products to support these new standards ahead of the competition, gaining a market advantage.
Prototype validation and small-batch production: During the chip design phase, FPGA is an ideal platform for validating video interface IP functionality. For small to medium batch professional devices (such as medical endoscopes, broadcast-grade switchers, high-end testing instruments), overall development costs and flexibility are more important than just the material costs of the chip.
Disadvantages:
Higher development difficulty: Requires specialized FPGA developers and video knowledge, and may require purchasing or developing complex IP cores.
Higher costs: For single-function, high-volume applications, the cost of FPGA itself is much higher than that of dedicated chips.
Potentially higher power consumption: Implementing dedicated functions with general logic usually has lower power efficiency than ASIC/ASSP.
Guangzhou Wanshitong Technology provides FPGA video solutions that are particularly suitable for known scenarios such as automotive electronics and medical instruments, offering a more user-friendly experience than original IP resources. Our company provides various video interface solutions (HDMI, DP, VBO, MIPI, LVDS, SDI…) to allow customers to focus on developing their product’s unique applications.