EDA technology is a new technology developed rapidly in the early 1990s. It represents the latest development direction of electronic design. It takes computer as the working platform and integrates various technologies such as electronic technology, computer technology and intelligent technology to realize the automatic design of electronic products. EDA technology is also the inevitable trend of the development of highly developed information society, and its application is becoming more and more extensive. The main electronic industries include: communication industry, information industry, semiconductor industry, electronic component industry, consumer electronics industry, photoelectric and instrument industry. It is the core of modern electronic design and plays a very important role in modern electronic circuit design.

1. Development of EDA Technology

With the continuous development of large-scale integrated circuit technology, computer technology and electronic system design technology, the content of EDA technology is increasing at an alarming rate. Its emergence and development greatly shorten the product development cycle, and greatly improve the performance and price ratio. To sum up, its development is mainly divided into four stages:

(1) The 1970s was the stage of computer aided design (CAD). People began to use computer-aided IC layout editing, PCB layout and wiring, instead of manual operation.

(2) The 1980s was the stage of Computer Aided Engineering (CAE). Compared with CAD, CAE not only has pure graphics drawing function, but also adds circuit function design and structure design, and combines the two through electrical connection network table to realize engineering design. The main functions of CAE are: schematic input, logic simulation, circuit analysis, automatic layout and wiring, PCB post analysis.

(3) The 1990s was the electronic system design automation (EDA) stage.

(4) Modern EDA technology takes the computer as a tool, and on the EDA software platform, according to the design documents completed by the hardware description language HDL, it can automatically complete the logic compilation, logic simplification, logic segmentation, logic synthesis and optimization, layout and wiring, logic simulation from the electronic system described by software to the hardware system, until the adaptation compilation for the specific target chip is completed Logical mapping and programming download.

2 main contents of EDA Technology

ESDA represents the latest development direction of today’s electronic design technology. Its basic characteristics are that designers carry out scheme design and function division of the whole system according to the “top-down” design method. The key circuits of the system are realized by one or several application specific integrated circuits (ASIC), and then the system behavior level design is completed by hardware description language (HDL), Finally, the final target device is generated by synthesizer and adapter. Such a design method is called high-level electronic design method.

The new “top-down” design method starts with the division of functional block diagram and structural design at the top level from the system designer. Simulation and error correction are carried out at the block diagram level, and the high-level system behavior is described with hardware description language, which is verified at the system level. Then, the net list of specific gate circuits is generated by the comprehensive optimization tool, and the corresponding physical implementation level can be printed circuit board or application specific integrated circuit. Because the main simulation and debugging process of the design is completed at a high level, on the one hand, it is conducive to early find the errors in the structural design and avoid the waste of design work. At the same time, it also reduces the workload of logic function simulation and improves the primary success rate of the design.

With the increasing complexity of modern electronic products, an electronic system may be composed of tens of thousands of small and medium-sized integrated circuits, which brings the problems of large volume, high power consumption and poor reliability. The effective way to solve this problem is to design with ASIC (application specific integrated circuits) chip. ASIC can be divided into full custom ASIC, semi custom ASIC and programmable ASIC (also known as programmable logic device) according to different design methods.

When designing a fully customized ASIC chip, the designer should define the geometry and process rules of all transistors on the chip, and finally submit the design results to the LC manufacturer for mask manufacturing. The advantages of this are: the chip can obtain the best performance, that is, high area utilization, high speed and low power consumption; The disadvantages are: long development cycle and high cost, which is only suitable for mass product development.

The layout design methods of semi custom ASIC chips are different. They are divided into gate array design method and standard cell design method. These two methods are constrained design methods. Their main purpose is to simplify the design and shorten the development time at the expense of chip performance.

The difference between the programmable logic chip and the above mask ASIC is that after the Designer completes the layout design, he can burn his own chip in the laboratory without the participation of IC manufacturers, which greatly shortens the development cycle.

HDL (hardware description language) is a computer language used to design hardware electronic systems. It uses software programming to describe the logic function, circuit structure and connection form of electronic systems. Compared with the traditional gate level description, it is more suitable for the design of large-scale systems. VHDL is a comprehensive hardware description language, including multiple design levels of system behavior level, register transfer level and logic gate level. It supports the mixed description of structure, data flow and behavior. Therefore, VHDL almost covers the functions of various previous hardware description languages. The whole top-down or bottom-up circuit design process can be completed by VHDL.

3 application of EDA Technology

EDA technology has developed very rapidly in recent years. It plays a more and more important role in the design of electronic systems in the fields of teaching, scientific research, communication, national defense, aerospace, medicine, industrial automation, computer application, instrumentation and so on.

(1) In Teaching

Almost all colleges and universities of science and Engineering (especially electronic information engineering) have set up EDA courses. It is mainly to let students understand the basic principles and basic concepts of EDA, master the method of describing system logic with VHDL hardware description language, use simulation software tools to carry out simulation experiments of electronic circuit courses, and let students engage in the design of simple electronic systems during graduation design, so as to lay a foundation for future work.

(2) In scientific research

Circuit design and simulation are mainly carried out by using circuit simulation tools; Product debugging with virtual instrument; The development of FPGA devices is applied to instruments and equipment. In the CDMA wireless communication system, all mobile phones and wireless base stations work in the same spectrum. In order to distinguish different calls, each mobile phone has a unique code sequence. The CDMA base station must be able to distinguish these code sequences with different views in order to distinguish different paging processes; This discrimination is that a specific code sequence is detected in the input data stream through the output display of the matched filter; FPGA can not only provide good filter design, but also complete the advanced data processing function of DSP, so FPGA is widely used in modern communication field.

(3) In product design and manufacturing

From high-performance microprocessor and digital signal processor to color TV, audio and electronic circuit, EDA technology is not only applied to early computer simulation and product debugging, but also plays an important role in the development and production of electronic equipment and the welding process of circuit board. It can be said that EDA technology has become an indispensable and important part in the field of electronic industry.

4 Conclusion

With the continuous development of microelectronic technology and computer technology, the development of electronic products changes with each passing day. EDA technology has become the core of modern electronic design. Its development will be a major technological revolution in the field of electronic design and electronic industry. At the same time, it also puts forward deeper and higher requirements for the teaching and scientific research of electronic professional courses. Mastering and popularizing EDA technology will have important and far-reaching significance for the development of electronic technology in China.

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