What Is FPGA and What Is it Used For?

FPGAs provide benefits to different types of electronic equipment. From aircraft navigation to medical ultrasounds and data search engines, people rely on FPGAs for the development and use of technology they use on a daily basis.

This article provides information on what FPGA is and what it is used for. If you're interested in these topics, you will enjoy reading this article.

What Is FPGA?

FPGA is an acronym that stands for Field Programmable Gate Array. It is a semiconductor device based on a matrix of configurable logic blocks (CLBs) whereby a large majority of the electrical functionality inside the device can be changed by the design engineer.

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FPGA is defined by its array of interconnected digital subcircuits that implement common functions while also offering high levels of flexibility. FPGAs belong to a class of devices referred to as programmable logic (or programmable hardware). FPGA does not do anything by itself; rather it is configured to be any digital circuit required. So, how does it work?

How Does an FPGA Work?

Understanding how an FPGA works is straightforward. It involves loading a configuration into the FPGA which then begins to behave like any circuit you require. No fuss, no stress. Its RAM-based configuration means it can be reconfigured an unlimited amount of times.

Types of FPGA

There are two main ways of classifying FPGAs: by their internal arrangement of blocks or by their type of programming technology. FPGAs fall into one of three categories when it comes to their arrangement:

1. Symmetrical arrays: This arrangement is made up of rows and columns of connected logic blocks, surrounded by input/output blocks.
2. Row-based architecture: This arrangement alternates rows of logic blocks and programmable interconnect resources, with input/output blocks along the edges.
3. Hierarchical PLDs (programmable logic devices): These have a more complex layout. The top-level is made up of logic blocks and interconnects. The logic blocks contain logic modules, which have combinatorial and sequential functional elements.

Common Uses of FGPA

There are a myriad of uses for FPGA which cover a vast range of areas. The use cases include:

1. Video and imaging processing.
2. Military applications.
3. Software-defined radio.
4. Medical imaging.
5. Wired and wireless communications.
6. Integration of multiple simple programmable logic devices.
7. Voice recognition.
8. Cryptography.
9. Digital signal processing.
10. ASIC prototyping.
11. Device controllers.
12. Computer hardware emulation systems.
13. Bioinformatics.
14. High-performance computing.
15. Aerospace & defense.
16. ASIC prototyping.
17. Automotive.
18. Consumer electronics broadcast.
19. Data center medical.
20. Scientific and industrial instruments.

Benefits of Using FPGA

FPGA offers many advantages over conventional implementations.

Benefits	Details
Integration	The more functions within the FPGAs of today (which include on-die processors, transceiver I/Os at 28 Gbps or more, RAM blocks, DSP engines) the fewer devices on the circuit board. This increases reliability by reducing the number of device failures.
Flexibility	The functionality of FPGA can change upon every power-up of the device. This means that if a design engineer wants to make a change, they can simply download a new configuration file into the device and try out the change.
Acceleration	FPGA are brought to the market quicker because they are sold ‘off the shelf’. Due to the FPGA flexibility, original equipment manufacturers can ship systems as soon as the design is proved to be working and tested.
Long-term Availability	The use of FPGAs gives you independence from component manufacturers, because the functionality is not in the module itself but within its configuration. This programming can be done in a manner that does not require any adjustments on different FPGAs

The Differences Between FPGA and ASIC

ASIC (Application Specific Integrated Circuits) and FPGAs have different value propositions. What distinguishes FPGAs from ASIC is the fact that FPGA can be reprogrammed to a desired application or functionality requirements after manufacturing whereas ASIC is custom manufactured for specific design tasks. These reprogramming changes can occur during the PCB (Printed Circuit Board) assembly process, or even after the equipment has been shipped out to the customers.

Although one-time programmable (OTP) FPGAs do exist, the dominant and most common types are RAM-based which makes them reprogrammable as the design continues to evolve.

Furthermore, FPGAs are sold off the shelf, unlike ASICs which require manufacturing cycles that end up taking several months.

Performance and Versatility of FPGA

FPGA offers superior levels of performance and versatility which makes them the go-to technology for people and organizations looking to optimize chips or make changes to chips for their workload.

A great example of the increasing significance of FPGAs can be found in the field of artificial intelligence. As artificial intelligence continues to gain relevance, so has the importance of FPGAs. In certain cases, FGPAs outperform GPUs (Graphical Processing Units) in analyzing huge amounts of data for machine learning.