1. 为什么需要Sequential Logic? 上一节讲到了combinational logic,现在假设有一种新的需求:比如说我们手机的锁屏键,我们需要制作一个按钮,当屏幕灯是开的,那么按按钮之后屏幕灯会被关闭;当屏幕灯是关的,按下按钮后屏幕灯会被打开。 我们无法使用combinational logic 去解决这种需求。其中一个原因是,灯的开关状态并...
不过上面所有的电路都是不含存储记忆能力的Combinational Logic,输入完全决定输出。 而像寄存器等需要保存数据的电路结构,被称作Sequential Logic ,今天看看它们是怎么实现的。 如果用一张图代表二者的关系,那么如下: 先列举一些关键元素: Cross-coupled inverter R-S Latch Gated D Latch D Flip-Flop Register 最终再...
What is a sequential circuit in terms of computing? In digital logic and computing, a sequential circuit is a type of circuit where the output depends not just on the current input, but also on the history of inputs. This contrasts with combinational circuits, where output only depends on ...
I N COMBINATIONAL logic the output of a circuit is determined solely by the state of its inputs at any moment, but in sequential logic the output of a circuit depends on previous inputs as well as present ones; a sequential circuit has memory . The simplest devices with this property ...
A generic sequential logic circuit is shown in Figure 5.36. Here, the circuit inputs are applied to and the circuits outputs are derived from a combinational logic block. The sequential logic circuit elements store an output from the combinational logic that is fed back to the combinational ...
It should come as no surprise that because combinational logic is a type of circuit that depends only on the current inputs, the other type,sequential logic, is a type of circuit whose output depends on not only the current inputs but also the sequence of previous inputs. This means that...
Chapter7SequentialLogicDesignPrinciples(时序逻辑设计原理)LatchesandFlip-Flops(锁存器和触发器)ClockedSynchronousState-MachineAnalysis(同步时序分析)ClockedSynchronousState-MachineDesign(同步时序设计) BasicConcepts(基本概念)LogicCircuitsareClassifiedintoTwoTypes(逻辑电路分为两大类)：CombinationalLogic...
Introduction to Digital Logic Design 5.5.1 Introduction Sequential logic circuits are based on combinational logic circuit elements (AND, OR, etc.) working alongside sequential circuit elements (latches and flip-flops). A generic sequential logic circuit is shown in Figure 5.36. Here, the circuit ...
D flip-flops are created by the logic synthesizer when aclocked always blockis used (Seealwaysblock2). A D flip-flop is the simplest form of "blob of combinational logic followed by a flip-flop" where the combinational logic portion is just a wire. ...
数字集成电路chapter7 sequential Logic