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Decades ago, when computation was getting complex and operations were difficult to perform, the tech world was more inclined to make a processor that could integrate numerous transistors on a microchip. Consequently, VLSI (very-large-scale integration) technology was introduced to embed billions of transistors on a single microchip easily. This technology improved efficiency, increased the computation power, decreased the cost, and made all these features possible on a single silicon chip!
FPGA And ASIC are the two VLSI technologies. FPGA (field programmable gate arrays) And ASIC (application-specific integrated circuits) are the two VLSI technologies. They have made the processing easier and optimized the computation. Multiple domains widely use both technologies nowadays, including:
This blog will cover the key features of FPGAs and ASICs and their key differences.
FPGA stands for Field Programmable Gate Array. It was first introduced in 1985 by Xilinx. Unlike the ASICs that are used for specific applications, FPGAs are flexible to use and can be reprogrammed even after they have been manufactured. They can be used for multiple applications. Hence, the FPGAs allow the system designers to blend and reprogram the FPGAs according to their system requirements, providing rapid prototyping, feasibility, ease of access, and adaptation to the changing design environment.
The FPGA is an array of logic gates. It has multiple CLBs (configurable logic blocks) and programmable interconnects. CLBs are just like digital sub-circuits, which efficiently implement common functions and are highly flexible. The CLBs include look-up tables, storage elements such as flip flops or registers, and multiplexers that enable CLBS to perform the functions. The interconnects are also programmable. These are used to connect the CLBs to one another and also enable the CLBs to connect with the external circuitry within the FPGA.
The FPGAs have a pipeline design that enables parallelism. FPGAs have high-speed serial transceivers which enable high-speed data transmission, reception, and communication with other devices. They also have phased locked loop PLL which are used for clock generation, distribution of stable and synchronized clock signals across different regions within FPGA and clock jitter reduction. FPGAs have external memory controllers and a column of dual port on-chip RAM that has 18k to 36k memory which helps store large data. There is a column of DSP 48 blocks that share the load of FPGA, enable arithmetic operations, and offer high computation.
The FPGA is programmed using hardware description languages such as VHDL and Verilog.
FPGA verification is very crucial while finalizing the prototype. There are multiple ways for FPGA verification. The HDL tools can be used to detect syntax errors, design rule violations and undefined signals. The HDL simulators can be used to model the behavior of some design under various internal conditions and this way one can compare the output to the expected results and identify the functional errors, hence allowing FPGA verification. The FPGA verification can also be done by verifying the timing constraints and ensuring that the design operates at desired clock frequency. The FPGA verification can also be performed by validating the design in an actual environment through multiple test input signals by which we can easily identify the errors in functionality, timing, and interaction with other system components. We can also use the debugging tools provided by the OEM to verify FPGA.
ASIC stands for Application-Specific Integrated Circuits. Unlike FPGAs, the ASICs are used for highly specific tasks. For example, an ASIC responsible for sensor data detection in a car engine would only detect the data. It will not process it or activate the actuators. The ASICs are programmed for their specific applications at the time of manufacturing, they can neither be reprogrammed nor altered by anyone else once it is manufactured. The logic function of an ASIC cannot be changed as the circuitry, i.e., the number of gates and flip flops and their interconnections, is fixed. The design and manufacturing process for ASICs is complex and time, and it has a high initial cost as compared to the FPGA, but the cost of mass production is cheap as compared to the FPGA.
As stated earlier, the manufacturing of ASICs is complex. During the design phase, multiple things are to be done:
ASICs have standard logic cells, which are the same as the CLBs in FPGAs. The ASICs have memory blocks, and the designer can choose any memory type such as SRAM (Static Random Access Memory), DRAM (Dynamic Random Access Memory), ROM (Only Memory), eNVM (Embedded Non-Volatile Memory), and Flash memory. Unlike the FPGAs, ASICs have analog circuitry. They have PLLs (phase locked loops), which are used for clock generation, distribution of stable and synchronized clock signals across different regions within ASIC, and clock jitter reduction. They also have specialized functional blocks that are used for specific functions such as machine learning accelerators, image/video processing units, communication interfaces (USBs, ethernet, peripheral component interconnect express PCIE, etc.), sensor interfaces, processor codes, and cryptographic accelerators.
Although both are marvels of VLSI technology and do wonders, some differences exist between FPGAs and ASICs. The key differences are discussed below:
In the dynamic landscape of VLSI, the FPGA vs ASIC debate underscores the transformative journey from complex computation to integrated microchip solutions. FPGAs, with programmability and adaptability, redefine system design, while ASICs, tailored for specific tasks, excel in efficiency and cost-effectiveness. This exploration into FPGA vs ASIC architectures, design processes, and applications unveils the intricate tapestry of VLSI advancements. Whether embracing flexibility with FPGAs or precision with ASICs, both technologies in the FPGA vs ASIC saga continue to shape the future of computational possibilities with ongoing innovations in the ever-expanding realm of technology.
Fatima Razzaq is a freelance technical writer who served as an electrical engineering lecturer at Air University—a federally chartered public sector research university in Pakistan. Razzaq holds a Bachelor’s degree with distinction in electronic engineering from Ghulam Ishaq Khan Institute of Engineering Sciences and Technology (GIKI) and a Master’s degree in Sustainable Transportation and Electrical Power Systems from the University of Nottingham, Universidad de Oviedo, and La Sapienza University of Rome. Razzaq’s diverse work experiences in academia and industry continue to inform her prolific technical writing journey in the areas of electrical engineering, storage mechanisms, power electronics, electric vehicles, energy, and related topics.
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