Unit 5 Modern Digital DesignLesson 13 Overview of Modern Digital Design电子信息工程专业英语教程任治刚 主编 电子工业出版社 www.phei.com.cnDate1电子信息工程专业英语教程Lesson 13 Overview of Modern Digital Design Backgrounds Text tour Language in use Vocabulary Structure Reading/writing techniquesDate2电子信息工程专业英语教程 Terminology CD: compact disc 光盘 LP: long playing record 慢转密纹唱片 CAD: Computer Aided Design 计算机辅助设计 EDA: Electronic Design Automatic 电子设计自动化BackgroundsDate3电子信息工程专业英语教程 Terminology HDL: Hardware Description Language 硬件描述语言 VHDL 极高速集成电路(VHSIC)硬件描述语言BackgroundsDate4电子信息工程专业英语教程 Terminology ASIC: Application Specific Integrated Circuit 专用集成电路 PLD: Programmable Logic Device 可编程逻辑器件 PLA: Programmable Logic Array 可编程逻辑阵列 RTL: Register Transfer Level 寄存器传送级 BackgroundsDate5电子信息工程专业英语教程Text tour Outline Introduction Design automation Logic gates ASICs and FPGAs Design flowDate6电子信息工程专业英语教程Introduction Electronic circuit design analogue design digital design mixed-signal design Digital electronics is ever more significant in consumer goods The lifetimes of products have lessened Date7电子信息工程专业英语教程Design automation Digital design has become very dependent on CAD also known as DA or EDA The EDA tools allow two tasks to be performed Synthesis Simulation Methods for digital design description schematic capture hardware description language (HDL) Verilog VHDL Date8电子信息工程专业英语教程Logic gates The basic building blocks of digital circuits A gate is an electronic component with a number of inputs and, generally, a single output. The inputs and the outputs are normally in one of two states: logic 0 or logic 1. These logic values are represented by voltages (for instance, 0 V for logic 0 and 3.3 V for logic 1) or currents. The gate itself performs a logical operation using all of its inputs to generate the output. Date9电子信息工程专业英语教程It is possible to buy a single integrated circuit containing, say, four identical gates, as shown in Figure 5.1. (Note that two of the connections are for the positive and negative power supplies to the device. These connections are not normally shown in logic diagrams.) A digital system could be built by connecting hundreds of such devices together - indeed many systems have been designed in that way. Figure 5.1 A small-scale integrated circuit Logic gatesDate10电子信息工程专业英语教程ASICs and FPGAs Full-custom and semi-custom ICs ASICs Programmable logic devices PLAs (programmable logic arrays ) PALs (programmable array logic) CPLDs (complex PLDs) FPGAs (field programmable gate arrays).Date11电子信息工程专业英语教程Figure 5.2 PLA structure.ASICs and FPGAsDate12电子信息工程专业英语教程Design flow Write a specification. If necessary, partition the design into smaller parts and write a specification for each part. From the specification draw a state machine chart. This shows each state of the system and the input conditions that cause a change of state, together with the outputs in each state. Minimize the number of states. This is optional and may not be useful in all cases.Date13电子信息工程专业英语教程Design flow Assign Boolean variables to represent each state. Derive next state and output logic. Optimize the next state and output logic to minimize the number of gates needed. Choose a suitable placement for the gates in terms of which gates share integrated circuits and in terms of where each integrated circuit is placed on the printed circuit board Design the routing between the integrated circuits.Date14电子信息工程专业英语教程Text tour Figure 5.3 The overall design flow for RTL synthesis-based designDate15电子信息工程专业英语教程 Vocabulary capture, effective, term sequential, specification Structure Reading/writing techniquesLanguage in useDate16电子信息工程专业英语教程VocabularyDate17电子信息工程专业英语教程Capture in dictionaryTo take captive, as by force or craft; seize. 俘虏；捕获 To gain possession or control of, as in a game or contest: 赢得，夺取 To attract and hold: 吸引 tales of adventure that capture the imagination. To succeed in preserving in lasting form: 长久保存 capture a likeness in a painting. 保存一幅油画中的人物肖像Date18电子信息工程专业英语教程Capture in dictionaryThe phenomenon in which an atom or a nucleus absorbs a subatomic particle, often with the subsequent emission of radiation. 俘获Date19电子信息工程专业英语教程Capture in text Synthesis and simulation EDA tools require that the design be transferred from the designers imagination into the tools themselves. This can be done by drawing a diagram of the design using a graphical package. This is known as schematic capture. EDA综合工具和模拟工具均要求设计者将想法转化 为设计。使用图形化软件包画设计原理图可以实现 这一步。这种方法称之为“原理图输入” 。Date20电子信息工程专业英语教程Capture in use hole capture 空穴俘获 orbital electron capture 轨道电子俘获 signal capture 信号俘获Date21电子信息工程专业英语教程Effective in dictionary Having an intended or expected effect. 有效的 Producing a strong impression or response; striking 深 刻印象的 gave an effecti