EDA技术及其应用文献译文.doc

ABSTRACT System uses a top-level graphic design ideas, based on hardware description language AHDL, a programmable device as the core, with a small size, high reliability, flexibility and strong features. And compared EDA technologyand traditional methods of electronic design differences, summed up the advantages of other EDA technology.Keywords: EDA digital system CPLD VHDL Electronics design is the only way to digital, which has become a consensus. In the digital path, Chinas electronic technology has undergone a series of majorchanges. From the application of small-scale integrated circuits constitute the electrical systems, to the wide application of micro-controller or microcontroller (MCU), occur in the electronic system design a landmark leap forward. Electronic products is growing at an unprecedented pace with innovation, mainly in large-scale programmable logic devices widely used. Especially in the current semiconductor technology has reached the level of deep sub-micron chip integrated high-reach dry trillion bits, the clock frequency to the stem MHz or above is also the development of data bits per second, billions of times, the future of IC technology The trend is expected to be SOC (System 0n a Chip) system on a chip. In order to achieve system-on-chip programmable chip CPU (complex programmable logic devices), and FPGA (field programmable gate arrays) will become the future of electronic system design direction for development. Therefore, the development of electronic design technologies to today, turn to face a greater sense of another breakthrough, 5PGA in the EDA (electronic design automation) based on the widely used. The concept of EDA technologies: EDA electronic design automation acronym. Because it is a recently developed new technology, involving a wide range of rich content, understanding different, so there were no one precise definition. However, several key aspects of EDA technology, the content of view, can be interpreted as: EDA technology is based on large-scale programmable logic device design carrier, system logic hardware description language description of the principal mode of expression to the computer, large the scale of the development of programmable logic devices and experimental development system software design tools, through the development of software to automate software design of electronic systems approach to the hardware system a new technology. Logic can be achieved to compile, logic simplification, logic partitioning, logic synthesis and optimization, logical layout, logic emulation. Completed for a particular target chip adapter compilation, logic mapping, programming downloads and, ultimately, the formation of integrated electronic systems or application Specific Integrated Chip. EDA technology is accompanied by a computer, integrated circuits, electronic systems design and development together, and has more than 30 years of history. Can be roughly divided into three stages of development. 20th century 70s CAD (computer-aided design) phase: the main characteristics of this stage is to use computer-aided circuit schematic editor, PCB layout the same cloth, allowing designers from the traditional complex mapping highly repetitive labor freed. 20th century 80s QtE (computer-aided engineering design) stage: This stage is based on the main characteristics of the logic simulation, timing analysis, fault simulation, automatic placement and routing as the core, focused on solving the circuit design function tests and other issues, so that the design of the product produced can be predicted before the products features and performance. If age is 20 EDA (electronic design automation) phase: the main characteristics of this stage is based on high-level description language, system-level simulation and synthesis technology, the characteristics of a top-down design concept, will design the pre - many high-level design tools from the EDA to complete. EDA electronic design automation technology, which is able to help people design electronic circuits or systems software tools. The tool can be in electronic products all play a role in the design stage, so that the design of more complex circuits and systems possible. In the schematic design phase, you can use the EDA simulation tool in the proof of the correctness of the design; in chip design phase, you can use the EDA tools for chip design in the chip layout designed: In the circuit board design stage, you can use the EDA in the circuit board Design of multi-layer circuit board design tools. Especially to support hardware description language, the emergence of EDA tools to make complex digital system design automation is possible, as long as the available hardware description language description of the behavior of digital systems is correct, can be carried out in the digital system chip design and manufacturing. Some experts believe that the 21st century will be a 4 A period of rapid development of technology, EDA technology will have a major impact in the 21st century, one of the top ten technologies. EDA technology, the basic characteristics: EDA representative of todays electronic design technology, the latest developments in the direction of the use of EDA tools, electronics designers from concept, algorithms, protocols and so began to design electronic systems, a lot of work can be completed via a computer and electronic products can be From the circuit design, performance analysis to the IC layout design or PCB layout of the entire process in computer automatically processed.Designers using the design method is a high-level top-down as a new design method, this method first from the juice-based system design staff, in the top functional block diagram of the division and structure design. In the block diagram level simulation, error correction. And used for high-level hardware description language to describe the system behavior in the system into a driving license. Then, in an integrated optimization tool to generate a specific gate network table, its corresponding physical implementation level can be a printed circuit board, or application specific integrated circuit (ASIC).The designers work is limited to the use of software methods, namely, the use of hardware description languages and EDA software to complete the implementation of the system hardware functions. As the design of the main simulation and debugging process is completed at a high level, which is conducive to early detection of structural design errors, to avoid the waste of the design work, but also reduce the workload of the logic functional simulation to improve the design of the one-time success rate. As the complexity of modern electronic products and the increasing integration of the general separation of small and medium-scale integrated circuits combined can not meet the requirements, circuit design and gradually changed from a small chip the size of a large-scale, ultra-large-scale chips, with a high-speed, high - integration, low power programmable IC devices are already booming friends together. In the EDA technology used in large-scale, ultra-large-scale ASIC chips are called programmable chip, these programmable logic devices since the age of 70 has experienced CPLD, FPGA, CPLD, FPGA several stages of development, which CPLD ( Complex Programmable Logic Device) / FPGA (field-programmable logic devices) shoulder-high-density programmable logic devices, the current integration as much as 2 million / piece above, it will mask the advantages of high integration ASIC and Programming logic device design and production features a convenient combination is particularly suitable for samples or small quantities of product development Research to make products with the fastest speed available, and when the market expanded, it can be easily transferred to the ASIC mask implementation, thus greatly reducing the development risk. It can be said CPLD) / FPGA devices, has become a modern high-level electronic design method of implemetation of the Conference body. Hardware description language (HDL) is an important component of EDA technology, is a design and development of EDA software tools is very important, VHDL, namely: ultra-high speed integrated circuit hardware description language, is still the mainstream of electronics design, as the amount of any hardware description language. It has a very strong circuit description and modeling capabilities, from many different levels of the modeling and description of digital systems, thus greatly simplifying the hardware design task, improve the design and reliability than the strings, using the electronic system, VHDL design of a big advantage is that designers can concentrate on working to achieve its functions without the need for and process does not affect the function of factors related to spend too much time and effort. For example, a 32-bit adder, using graphical input software need to enter the 500 to 1 to miliion door, while the use of VHDL language need only write a line A = B + C can be. Use of hardware description language (HDL) simulation approach can be completed well before the need to design and produce prototypes can be carried out on the characteristics of the electronic circuit description and debugging. Can be found in the system-level behavior of possible errors, problems, and demonstrated to be repeatedly modified to avoid the physical damage and multiple-level production of the device, saving time and development costs, shortens the development cycle of electronic systems. Technology and the EDA design methodology to compare the traditional can be seen, the traditional design of digital systems only in the circuit board design is a building-block-style way to make a complex circuit design, debugging is very difficult; if a process errors. Is very inconvenient to find and modify; for integrated circuit design, the design implementation process and are directly related to the specific manufacturing process, so portability is poor; only in the design of a prototype or production of the chip before any real swim under water, so long product development cycle. Electronic EDA technology is very different, using programmable devices, by designing chips to achieve the system functionality. Using a hardware description language as a design input and libraries (Libraly) the introduction of the device defined by the designers internal logic and pins, originally performed by the circuit board design is complete and therefore most of the work carried out in the chip design. As the pin definition of flexibility, thus greatly reducing the schematic design and circuit board design of the workload and the difficulty of effectively enhance the design flexibility, improved working efficiency. And can reduce the number of chips, reduce system size, lower energy consumption and increase system performance and reliability. Be able to use full-automatic computer design, simulation and debugging. Hardware Description Languages: Hardware Description Language (HDL) is an electronic system used for computer hardware design, high-level language, which uses the software design methodology to describe the logic functions of electronic systems, circuit structures and connections available. Hardware description language can be carried out at three levels of circuit description, which is divided into behavioral level from high to low, R, a few-level and gate-level. Commonly used hardware description language WDL, Verilog and AHDL language. AHDL language is a high-level description language for behavior-level and R, a few-level description; Verilog language and AHDL language belongs to a lower-level description language for R, a few-level and gate-level description. Now AHDL and Verilog as industry-standard hardware description language, has been supported by many EDA companies in the electronic engineering field, they have become the de facto common hardware description language, bear almost all of the digital system design task.Application of Vf for electronic system design has the following advantages: (1), compared with other hardware description languages, WDL behavior have a stronger description ability, a strong ability to avoid the behavior description of specific device structures, from the logical behavior of the specification and design an important guarantee for large-scale electronic systems.(2) VHDL simulation rich statements and library functions, allowing in any large system design early will be able to check the feasibility of the design function of the system and can simulate the system at any time. (3) Vf statements describing acts of capacity and program structure, determines that it has the support of a large-scale decomposition of the design and the design re-use of existing capabilities. (4) with Vf the completion of the design, EDA tools can use logic synthesis and optimization, can be based on different target devices automatically Vf describe the design into a gate-level netlist, this design approach greatly reduces the time the circuit design and the possible errors, thus reducing development costs. (5) VHDL description of the design has a relative independence can be rigid pieces of structure, the designer is not the case, nor do we need to design the ultimate goal of what the device, while the independent design. (6) Since the VF has a generic description of statements and subroutine calls and other functions, which is why the design has been completed, you can not change the source code of plants, simply by changing the generic parameters or functions can be easily changed and the meter the size and structure. Reposted elsewhere in the Research Papers Download EDA technology applications: EDA technology is developing rapidly, and gradually in teaching ,Research , product design and manufacturing, and other aspects have played a huge role. In education: almost all science and engineering (especially electronics information) class colleges and universities have opened EDA courses. EDA is designed to allow students to understand the basic principles and basic concepts, scales with the Dian-L grip method of describing the system logic, using throw A tool for electronic circuit simulation program for graduation in the design of experiments and is engaged in the design of a simple electronic system for the lay the foundation for future work. Representative held once every two years, the National Undergraduate Electronic Design Contest activities. In scientific research: The main advantage of circuit simulation tools (EWB or PSPICE, VLOL, etc.) circuit design and simulation; the use of virtual instruments for product debugging;) / FPGA development and application of the device to the instrument device. For example, in CDMA wireless communication systems, all mobile handsets and wireless base stations are working in the same spectrum, in order to distinguish between different calls, each phone has a unique code sequence, CDMA base station must be able to distinguish these different views yards sequence in order to distinguish different paging process; the judge through a matched filters output is displayed in the input data stream in the probe transferred to a particular code sequence; FPGA can provide a good filter design, and advanced data processing to complete the DSP function, thereby FPGA in the field of modern communication was widely used. In product design and manufacturing: from high-performance microprocessors, digital signal processor until the color TV sets, stereos and electronic toys circuit, EDA technology is not only applied to the pre-computer simulation, product commissioning, but also in P which production, development and production of electronic devices, circuit board welding, friends and other than that of the production process plays an important role. It can be said of electronic EDA technology has become an indispensable electronics industry technical support. EDA technology trends: EDA technology in the 21st century, due to more large-scale FPGA and Au m devices continue to be introduced in the simulation and design to support both standard hardware description language, a powerful EDA software constantly updated to increase, so that Electronic EDA technology has been even greater development. Full range of electronic technology into the EDA field, EDA makes the electronics more blurred the boundaries of various disciplines, more mutually inclusive, especially in the following aspects: to enable electronic design results with independent intellectual property rights in ways that allowed articulate and confirm possible; ASIC Design EDA tools based on standard cell are already covered by a large-scale electronic systems and IP core module; software and hardware IP core in the electronics industry, industries, technology and design applications to be further confirmed; SoC low-cost and efficient design techniques to mature. As the semiconductor technology, integration of technology and the rapid development of computer technology, electronic system design methodology and design tools have undergone great changes. It can be said of electronic EDA technology is a revolution in the field of electronic design. The traditional fixed-function manifold block to connect design approach is gradually to withdraw from the stage of history, while the chip-based design approach is becoming the mainstream of modern electronic system design. As a relevant professional institutions of higher learning for students and the vast majority of electronics engineers to understand and climbing grip this advanced technology is imperative, not only the need to improve design efficiency, but also the development needs of the times, and only shook EDA technology before climbing have the ability to participate in t