•• XVII Acknowledgments CHAPTER 1 Verilog - A Tutorial Introduction 1 Getting Started 2 A Structural Description 2 Simulating the NAND Latch 4 Module Hleral'Chy 6 The Counter 7 Components of the Counter 9 A Clock for the System 10 Tying the Whole Circuit Together 11 Using An Alternate Description of the Flip Flop 13 Behavioral Modeling 1 S A Behavioral Model of the m16 Counter 16 Mixing Structure and Behavior 18 Assignment Statements 22 Summary on Mixing Behavioral and Structural Descriptions 23 Creating a Testbench For a Module 24 Summary 2S Tutorial Guide to Formal Syntax Specification 26 Exercises 30 CHAPTER 2 Behavioral Modeling 33 Process Model 33 If-Then-Else 3S Where Does The ELSE Belong? 39 The Conditional Operator 41 Loops 41 Four Basic Loop Statements 42 Exiting Loops on Exceptional Conditions 45 Multi-way branching 46 If-Else-If 46 Case 46 Comparison of Case and If-Else-If 48 viii The Verilog Hardware Description Language Casez and Casex 49 Functions and Tasks SO Tasks 52 Functions 55 A Structural View 57 Rules of Scope and Hierarchical Names S9 Rules of Scope 60 Hierarchical Names 62 Summary 63 Exerdses 63 CHAPTER 3 Concurrent Processes 6S Concu"ent Processes 6S Events 67 Event Control Statement 67 Named Events 69 The Walt Statement 72 A Complete Producer-Consumer Handshake 74 Comparison of the Wait and While Statements 77 Comparison of Wait and Event Control Statements 78 A Concu"ent Process Example 78 Disabling Named Blocks 84 Intra-Assignment Control and Timing Events 87 Procedural Continuous Assignment 90
XV From the Old to the New xvii Acknowledgments xx| Verilog A Tutorial Introduction Getting Started 2 A Structural Description 2 Simulating the binaryToESeg Driver 4 Creating Ports For the Module 7 Creating a Testbench For a Module 8 Behavioral Modeling of Combinational Circuits 11 Procedural Models 12 Rules for Synthesizing Combinational Circuits 13 Procedural Modeling of Clocked Sequential Circuits 14 Modeling Finite State Machines 15 Rules for Synthesizing Sequential Systems 18 Non-Blocking Assignment (
This is a completely revised edition of the previously titled Solute Movement in the Soil-Root System . It describes in detail how plant nutrients and other solutes move in the soil in response to plant uptake, and it provides a basis for understanding processes in the root zone so that they can be modeled realistically in order to predict the effects of variations in natural conditions or our own practices.
The cambium has been variously defined as follows: "The actively dividing layer of cells that lies between, and gives rise to, secondary xylem and phloem (vascular cambium)" (IAWA 1964); "A meristem with products of periclinal divisions commonly contributed in two directions and arranged in radial files. Term pre ferably applied only to the two lateral meristems, the vascular cambium and cork cambium, or phellogen" (Esau 1977); and, "Lateral meristem in vascular plants which produces secondary xylem, secondary phloem, and parenchyma, usually in radial rows; it consists of one layer of initials and their undifferentiated deriva tives" (Little and Jones 1980). Clearly, the cambium is a diverse and extensive meristem, and no one defini tion will encompass all manifestations of what anatomists consider cambium. Its diversity and extent are further exemplified by a single plant, such as a temperate zone tree, in which procambium is initiated in the embryo and perpetuated throughout every lateral, primary meristem before giving rise to cambium in the secondary body. The cambium thereafter performs its meristematic task of producing daughter cells that differentiate to specialized tissue systems. The cam bium, however, does not remain static. Its derivatives vary either in form, or TImc tion, or rate of production at different positions on the tree, with age of the tree, and with season of the year. Moreover, the cambium responds both to internal sig nals and to external stimuli such as environment or wounding.
Sets out to guide the trainer into a dynamic way of evaluating the opportunities and benefits of training by relating them directly to the financial performance of an organization. It presents the key concepts, frameworks and basic tools to develop training strategies and plans relevant to the actual needs of a business.
Provides ideas, suggestions and tips on how to run effective and efficient workshops. The text has been designed for flexibility so that the trainer, whether novice or experienced, can incorporate the practical ideas into existing workshop programmes.
This atlas includes complete coverage of greater Manchester. It includes postcodes on mapping and a two-colour index. Each map contains details of emergency services, farms, public buildings and car parks.
An excellent value atlas featuring fully updated cartography from Philip's digital database, which has been voted Britain's clearest and most detailed mapping in an independent consumer survey and now includes speed camera locations. This atlas includes all the mapping features normally included only in more expensive road atlases.The front section includes route-planner, distance table, legend, London street map, chart of motorway junctions with restricted access, and key map.The road map section includes 96 pages of large-scale mapping covering Britain at 3 miles to 1 inch (north Scotland at 4 miles to 1 inch), marking all fixed speed cameras as well as full road network and town and village details.The town plan section includes 53 town centre maps, marking car parks and places of interest.The comprehensive index includes 28,000 namesMain map scale: 3 miles to 1 inch
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