计算机专业英语第2版课件

A combinational circuit is a connected arrangement of logic gates with a set of inputs and outputs. At any given time, the binary values of the outputs are a function of the binary combination of the inputs.
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Notes
[3] The logical configuration of a shift register consists of a chain of flip-flops in cascade, with the output of one flip-flop connected to the input of the next flip-flop.
此句中的“with the output of one flip-flop connected to the input of the next flip-flop”是独立结构作状语，说明触发器连接 的方式。
译文：移位寄存器的逻辑结构包含一个级连的触发器链，一个触发 器的输出端被连接到下一个触发器的输入端。
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4-bit shift register
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The capabilities of shift register
▪ An input for clock pulses to synchronize all operations.
▪ A shift-right operation and a serial input line associated with the shift-right.
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ቤተ መጻሕፍቲ ባይዱ
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Flip-Flop and Clock
A flip-flop is a synchronous device; it is clocked, and it can change state only on arrival of a clock pulse.
Clock pulses are basically square waves; they may have a very low repetition, or they may have a very high repetition rate.
[4] Sometimes it is necessary to control the shift so that it occurs with certain clock pulses but not with others.
此句中的“it”是形式主语，“to control the shift”是真正主语， so that引导状语从句。
▪ N parallel output lines.
▪ A control state that leaves the information in the register unchanged even though clock pulses are applied continuously.
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1.1 Hardware Basics
Text： Logic Circuits Combinational Circuit Flip-Flop and Clock Shift registers
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Logic Circuits
The OR circuit has two or more inputs and a single output. The inputs and the output can each be at one of two states, 0 or 1.
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Key Words
arbitrary asynchronous bi-directional Boolean algebra Boolean function cascade clock pulse combinational circuit data pulse inhibit initiate interconnection
The AND circuits also has several inputs and only one output. However, the circuit output is at a logical 1 state only if all inputs are in the logical 1 state simultaneously.
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Unit 1 Hardware Knowledge
1.1 Hardware Basics 1.2 Central Processing Unit 1.3 Memory 1.4 Input/Output Systems 1.5 Computer Components
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[2] The OR circuit is arranged so that the output is in state 1 when any one of the inputs is in state 1.
句中“so that”引导目的状语，“when”引导的是时间状语从句。 译文：“或”电路被设计成当任一输入为1态时输出为1态。
▪ A shift-left operation and a serial input line associated with the shift-left.
▪ A parallel load operation and n input lines
associated with the parallel transfer.
任意的 异步的 双向的 布尔代数 布尔函数 级连的，串级 时钟脉冲 组合电路 数据脉冲 禁止，抑制 开始，激发 互联
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Key Words
inverter logic gate methodology negative opposite parallel transfer positive serial input simultaneously unidirectional variable
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RS flip-flop
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Shift registers
A register capable of shifting its binary information in one or both directions is called a shift register.
本句中的“digital computers”作定语，修饰“design”，而“which uses three basic…”是定语从句，修饰“Boolean Algebra”。 译文：数字计算机的设计基于称为布尔代数的逻辑方法学，它采用三种基 本运算：逻辑加，称为“或”功能；逻辑乘，称为“与”功能，和逻辑求 补，称为“非”功能。
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数字计算机 真值表 逻辑判决 同步设备 方波 并行输出 触发器 门控锁存器
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Reading Material
——RISC Technology
The RISC methodology is based on a top-down approach guided by a set of architectural design criteria. The major goal is to reduce the semantic gap between the hardware machine and the application level, while maximizing the execution speed.
译文：有时有必要控制移位以使它对一特定的时钟脉冲而不对其 他脉冲发生。
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英汉词组互译
（1）R-S触发器 （2）向左移位操作 （3）输出变量 （4）8位移位寄存器 （5）二进制信息 （6）反向器，非门 （7）布尔代数 （8）时钟脉冲
R-S flip-flop a shift-left operation output variable 8-bit shift register binary information inverter Boolean algebra clock pulse
计算机专业英语（第2版）
卜艳萍 主编 周 伟 赵 蕾 副主编
冯世常 主审
电子工业出版社
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内容简介
“计算机专业英语”是高职高专计算机应用类专业学生的基础课， 是提高学生计算机知识和英语综合运用能力的课程。本教材采用最 新的计算机专业技术资料，涵盖计算机硬件和软件技术、计算机应 用技术及计算机网络技术等专业知识。 本书共4个单元，第1单元介绍计算机硬件知识，包括计算机硬件 基础、处理器、存储器、输入/输出技术，以及计算机组成部件。第 2单元是计算机软件知识，内容有C语言、操作系统、数据结构、编 译原理及软件工程。第3单元是计算机应用方面的知识，内容有数据 库技术、计算机图形学、多媒体技术、CAD及ERP知识介绍。第4 单元是计算机网络相关知识介绍，包括计算机网络、互联网、远程 教育、电子商务和网络安全。
The simplest possible shift register is one that uses only flip-flops.
The output of a given flip-flop is connected to the D input of the flip-flop at its right. The clock is common to all flip-flops. The serial input determines what goes into the leftmost position during the shift. The serial output is taken from the output of the rightmost flip-flop.