EDA VHDL language as the core technology in medical applications (1).

<P> 0 Introduction </ P> <P> VHDL high speed integrated circuit hardware description language, with the systematic and highly integrated circuits gradually developed, and is used for digital system design, testing, for more .areas, multi-level IEEE standard hardware description language. .It is 70 years from the 20th century was born as a circuit design tools since the U.S. Department of Defense has become a very popular hardware description tools, and support for most EDA tools. .As electronic technology advances, digital system design is moving at high speed, large capacity, small size direction. .The traditional bottom-up model can not meet the chip and system design requirements. .In order to improve design efficiency and to simplify the design process, dramatically reducing the difficulty of the VHDL design methodology designed by the attention. .VHDL description language other than the traditional integrated circuits, has obvious advantages: </ P> <P> (1) powerful, strong description. .Can be used for gate level, circuit level or system-level description, simulation and design. .</ P> <P> (2) better portability. .For the design and simulation tools and on different platforms can use the same description. .</ P> <P> (3) short development cycle, and low cost. .</ P> <P> (4) can extend the design life cycle. .</ P> <P> (5) with a circuit simulation and verification capabilities, users do not even have to write the test phase the amount of source-level debugging. .Circuit designers can skip directly to compare the various options and choices, and the design efficiency can be improved. .</ P> <P> (6) a description of the design with relative independence. .</ P> <P> (7) language standards, codes, easy sharing and reuse. .</ P> <P> Currently, VHDL and related electronic technology penetration in various industrial fields, in the industrial design is playing an increasingly important role. .In the world, on the VHDL in many areas especially in the chip, system design and its application research attention has been made many achievements. .</ P> <P> and the combination of VHDL and medicine, will become the electronic design automation (EDA) a new research direction, this study will be used in medical EDA VHDL through to the measurement of the pulse, for example, to .digital system on the human body and physiological response to a variety of physiological activities intuitive accurate measurement. .</ P> <P> 1 Experimental Design </ P> <P> 1.1 EDA technology in medical teaching in the pulse measurement of </ P> <P> in clinical diagnosis, nursing and so the pulse is described .pulse measurement that is easy to beat the outside of the wrist palm touched the radial artery, the carotid artery is also measure the neck or groin of the femoral artery. .The measurements are put in the patient comfortable arm position, with the index finger, middle finger, ring finger of the pulp-side press the surface of the radial artery, usually the patient silently count half a minute. .The measured pulse rate will be multiplied by 2, the clock is a minute number of patients with abnormal test for one minute. .Adults in a quiet state of the pulse per minute is 60 to 80 times. .If less than 60 times a bradycardia. .But well-trained athletes, are sometimes 60 times the pulse of the following, this is the healthy heart performance. .If more than 100 times a tachycardia. .Physical activity or emotional excitement, the pulse may be temporarily faster, the pulse of a fever is also faster. .Generally temperature is increased by 1 ℃, the pulse to increase from 10 to 20 times. .This method is only a rough calculation of the pulse beat. .Applications, such as the VHDL language in which they can test me in the seven sections of EDA <U> digital </ U> direct and accurate count of one minute to see the results, and previous teaching methods by medical textbooks, compared the results measured .Yes, to determine the measure of right or not. .</ P> <P> 1.2 design ideas </ P> <P> <U> the pulse signal through the pulse sensor </ U> collection into the computer, and then as an input signal, and this signal as the pulse signal, that is, if .clock signals in general, when the input <U> counter </ U> start counting, as in the following VHDL design of a decimal counter can be used to describe the pulse of signal counts collected. .</ P> <P> 1.3 VHDL design flow </ P> <P> VHDL process design shown in Figure 1. .</ P> <P align=center> </ P> <P> </ P> <P> Now, computer-aided engineering software vendors have become increasingly common hardware description language VHDL as input and CAD or EDA software .standard output, which provides comprehensive tools ALTEKA Max + Plus Ⅱ, the logic design capability with comprehensive, from editing, synthesis, routing to the simulation, downloads are very convenient. .</ P> <P> 2 Design and Analysis of Results </ P> <P> VHDL language design decade counter of the source: </ P> <P align=center> </ P> <P> </ P> .<P>.