ASIC vs FPGA: Which SoC Solution Is Right for Your Next Project?

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Comparing FPGA and ASIC: Which SoC is the Right Fit for Your Design? 

With the dynamic development of digital technologies, the demand for specialized integrated circuits that can enhance the performance of computer systems and improve their integrity is increasing. In this context, two main technologies, ASIC (Application-Specific Integrated Circuit) and FPGA (Field-Programmable Gate Array), are often compared in terms of costs, capabilities, and potential in the flexibility field. In this article, we will analyze which aspects are crucial for SoC systems, and which solution offers better features. 

SoC Development: What You Need to Know 

Before we move on, let’s start with the basics. What is this SoC? SoC (System on Chip) is an integrated circuit that combines all (or most) of the components needed for a complete computer system onto a single chip (silicon -based). In a traditional computer, various components such as the processor, memory, input-output controllers, and sometimes even graphics and network units, are separate components. In an SoC, these elements are integrated into a single chip design, which reduces size and cost while simultaneously increasing performance and energy efficiency. 

Design Verification: FPGA vs. ASIC 

ASICs refer to specialized integrated circuits designed to perform very specific tasks. Unlike general-purpose processors, ASIC is optimized for one function or a set of functions, allowing maximum performance with minimal power consumption. In the context of SoC, it most often serves as a hardware accelerator, dedicated controller, or specialized processor. 

On the other hand, FPGAs are a technology that allows for flexible digital circuit design even after the chip has been manufactured. Unlike ASIC, which has fixed functionality, FPGA can be reconfigured even after deployment in a system, making it an ideal solution for applications requiring high flexibility. The architecture of FPGA consists of multiple programmable logic blocks that can be interconnected in any way, creating a circuit tailored to specific tasks. It serves in SoC as a hardware accelerator, programmable controller, or also as a prototyping platform. 

More about FPGA you can find out here: 

What is Field-Programmable Gate Array (FPGA) and why is it used in hardware?

ASIC or FPGA: Which Programmable Technology Is More Cost-Effective? 

According to the 2020 Chaos Report by the Standish Group, only 31% of IT projects were successful, meeting the planned budget, time, and scope. Referring to the cost of choosing between ASIC and FPGA, it is important to remember that it depends on several key factors. ASIC involves high upfront costs (NRE) because it requires creating a unique lithographic mask for production, making it cost-effective only in mass production, where the unit cost decreases with higher volumes. A typical ASIC project may require an investment of around 5–10 million USD, with a development time of 12 to 18 months before production.

FPGA has much lower initial costs since it is a ready-made programmable chip, but the unit cost is higher than ASIC, especially for large-scale production. However, it offers greater flexibility, allowing for cheaper updates and modifications without needing to redesign the hardware. In the case of ASIC, any design error can be very costly, whereas FPGA allows for easy changes after deployment. Therefore, ASIC becomes cost-effective only at high production volumes, typically above 100,000 units, while FPGA is better suited for smaller projects where flexibility and quick deployment are priorities. 

Physical Design: Comparing ASIC and FPGA Performance 

For an IT specialist, the key difference between ASIC and FPGA in terms of performance is the level of optimization and data processing speed. ASIC achieves the highest performance because it is designed specifically for particular tasks, allowing for maximum optimization of logic paths, which minimizes latency and power consumption. This results in higher clock speeds, better throughput, and significantly lower latency compared to FPGA. “In applications where maximum efficiency is needed, particularly in mobile and automotive sectors, ASIC is still the go-to technology because of its unmatched power efficiency and performance.”- underlines Dr. Jan Rabaey from UC Berkeley. 

On the other hand, FPGA, while programmable, flexible, and easy to debug, has lower performance due to its more general architecture, which introduces additional delays and increases power consumption. FPGA is less efficient in handling highly demanding computations, especially in time-critical tasks such as signal processing, AI, or advanced embedded systems. Therefore, in projects requiring maximum performance and energy efficiency, ASIC is the better choice, while FPGA is more suitable where flexibility and reconfigurability outweigh pure performance. 

How Important is Integrity in Integrated Circuit? 

So what about the issue of integrity? The choice between ASIC and FPGA in the context of the SoC system depends on the level of control over design, reliability, and data security. ASIC offers a higher level of integrity because it is designed from the ground up with specific system requirements in mind, minimizing the risk of hardware errors. Every component can be optimized for operational consistency, protection against interference, and security, making it more resistant to external manipulation and configuration errors. 

FPGA, while offering flexibility and reconfigurability, can be more prone to integrity issues. Its programmable nature means that changes in hardware configuration may introduce new errors, which can affect system stability, especially in critical applications. Additionally, reconfigurable FPGA systems can be more vulnerable to security attacks, such as reverse engineering or malicious modification of the configuration. 

Physical Verification: Scalability 

From a technical standpoint, the scalability of ASIC and FPGA differs significantly, which has important implications, especially for long-term technology projects. ASIC offers limited scalability because its architecture is fixed. Once manufactured, any need for modification, expansion, or changes in functionality requires a complete redesign and production of a new chip. This approach does not easily support adaptation to future requirements or new standards, meaning that every new element in the system requires re-engineering, which is costly and time-consuming. Therefore, ASIC is more suitable for stable, well-defined SoC systems where production scalability, rather than functional scalability, is crucial. 

FPGA-based systems, on the other hand, offer much greater functional scalability, which is a significant advantage in dynamically changing technological environments. Thanks to its reconfigurability, it allows for the quick addition of new functions, architectural changes, or hardware expansion during the product lifecycle. This means that SoC systems based on FPGA can be flexibly developed and adapted to new standards without incurring the high costs associated with designing a new chip. FPGA also supports easy scalability across various applications by adjusting the use of logic resources, enabling optimal hardware adaptation as project complexity increases. 

Aspect 

FPGA 

ASIC 

Upfront costs 

Lower 

High 

Unit cost 

Higher 

Lower 

Performance  

Lower 

Higher 

Power consumption 

Higher 

Lower 

Flexibility 

High 

Low 

Time-to-market 

Faster 

Longer 

Scalability 

High 

Limited 

System integrity 

More prone to configuration errors and security vulnerabilities 
 

More robust and secure 

Tab. 1 FPGA vs. ASIC Comparison 

Top-Level System on Chip – Collaboration with InTechHouse 

ASIC and FPGA are two technologies that take different approaches. Does your project require greater flexibility, or are you aiming for maximum performance? Regardless of the answer, understanding the differences between ASIC and FPGA methodology will help you make an informed decision and choose the best SoC solution for your project. 

If you’re looking for a partner to choose the best solution, InTechHouse is the perfect choice. Our experienced engineering team offers comprehensive services in electronics design, software development, and the creation of advanced embedded systems. Our team of experts with years of experience will help you find the best solutions tailored to your needs. Take advantage of our specialists’ expertise and schedule a free consultation. 

FAQ 

Which industries should choose ASIC, and which should choose FPGA in terms of security?  

ASIC is preferred in industries with high performance and physical security requirements, such as automotive or military sectors. FPGA, on the other hand, is better suited for dynamic industries where flexibility is needed, such as telecommunications or IT, where cybersecurity threats can evolve quickly. 

When is it worth choosing FPGA over ASIC?  

FPGA is worth choosing in projects where rapid prototyping, flexibility, and the ability to make frequent changes are important. It is an ideal solution for smaller projects that may require reconfiguration or adaptation to evolving standards. 

Can FPGA replace ASIC in every application?  

FPGA cannot always replace ASIC, especially in applications that require maximum performance, minimal latency, and low power consumption. ASIC is better suited for situations where optimization for a specific function is necessary. FPGA is more appropriate where flexibility and the ability to quickly implement changes are key. 

Can FPGA and ASIC work together in a single SoC system?  

Yes, in many SoC systems, both ASIC and FPGA can be combined to take advantage of the best features of both technologies. ASIC can be used to handle critical high-performance functions, while FPGA can be employed for more flexible, reconfigurable parts of the system. This hybrid architecture allows for optimal use of the strengths of both solutions.