根据逻辑条件的判断构成程序分支结构 if 布尔表达式 then 顺序语句 end if; 当布尔表达式为 true 时, 执行 then 后面的顺序语句;
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具体描述电路各元件的端口及其连接; 以基本元件为基础逐级构建; 元件:已经定义的电路模块(实体),可以来自标准库中,也 可以是自己或他人以前编译过的实体; 元件的基本要点: 元件名 输入/输出端口特点;
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优先编码器 编码器(encoder)也属于码制转换器一类 (BCD—1-out-of-10) ( p.49 表 2-9 ) 优先编码器属于多对 1 转换关系,没有一一对应关系,难 以采用上述方式描述;
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Mealy 状态机设计要点: 设定若干状态; 用输入和状态控制进程; 用 case 语句分别选择每一个状态; 用 if 语句确定输入条件,指定相应的下一状态和输出值; 输出立即赋值(使用一个进程);
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寻址存储器(RAM 和 ROM) ROM 和 RAM 属于通用大规模器件,一般不需要自行设 计,特别是采用 PLD 器件进行设计时; 但是在数字系统中,有时也需要设计一些小型的存储器 件,用于特定的用途:临时存放数据,构成查表运算等。 此类器件的特点为地址与存储内容直接对应,设计时将 输入地址作为给出输出内容的条件;
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一、DSPs硬件系统组成 二、DSPs芯片的选择 三、DSPs最小系统设计 四、DSPs的结构及外设接口 五、DSPs系统设计
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93.1 Introduction 93.2 Hardware Redundancy 93.3 Information Redundancy 93.4 Time Redundancy 93.5 Software Redundancy 93.6 Dependability Evaluation
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Computer networks are geographically distributed collections of communication links and switching processors, the purpose of which is to transport data between computers, workstations, and terminals. In general the elements of a computer network must follow compatible rules of operation together to function effectively. These rules of operation are known as protocols
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The term computer graphics refers to the generation,representation, manipulation, processing, and display of data by a computer. Computer-generated images may be real or imagined, animated or still, two-dimensional (2-D) or three-dimensional (3-D).Today most computers, particularly those in the PC,Macintosh, or workstation categories
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The last decade has seen a revolution in software engineering tools and techniques. This revolution has been fueled by the ever-increasing complexity of the software component of delivered systems. Although the software component of delivered systems may not be the most expensive component, it is usually, however, “in series” with the hardware component; if the software doesn’t work, the hardware is useless
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