PPT-7. Latches and Flip-Flops

Digital Computer Logic Latches SR Latch Gated SR Latch D Latch RQ2011 2 A latch is a temporary storage device that has two stable states bistable It is a basic form of memory The SR SetReset latch is the most basic type It can be constructed from NOR gates or NAND gates With NOR gates the latch responds to activeHIGH inputs with NAND gates it responds to activeLOW inputs. ELECTRONICS RevB4/21/2010(2:04PM)Prof.AliM.NiknejadUniversityofCalifornia,BerkeleyCopyrightc\r2010byAliM.Niknejad A.M.NiknejadUniversityofCalifornia,BerkeleyEE100/42Lecture24p.1/20 0 0 0 0 0 0 1 1 0 1 0 0 0 1 1 0 1 0 0 1 1 0 1 1 1 1 0 1 1 1 1 0 T flip-flop excitation table T Qcurrent Qnext 0 0 0 0 1 1 1 0 1 1 1 0 Step 2: derive the excitation table from the next stat 1. Flip-Flops. Last time, we saw how latches can be used as memory in a circuit.. Latches introduce new problems:. We need to know when to enable a latch.. We also need to quickly disable a latch.. In other words, it. By. Dr. Amin Danial Asham. References. An Introduction to Logic Circuit Testing. 3. LEVEL-SENSITIVE . SCAN . DESIGN (LSSD). The . level-sensitive. . aspect of the . method means . that a sequential circuit is designed so that the steady-state response to any input . Flip - Digital Electronics TM 3.1 Introduction to Flip - Flops Project Lead The Way, Inc. Copyright 2009 1 Digital Electronics Flip - Flops & Latches Flip - Flops & Latches 2 This presentation will Sequential Circuits. Part 1. KFUPM. Courtesy of Dr. Ahmad . Almulhem. Objectives. Sequential Circuits. Storage Elements (Memory). Latches. Flip-Flops. KFUPM. Combinational vs Sequential. A . combinational. © 2014 Project Lead The Way, Inc.. Digital Electronics. Flip-Flops & Latches. 2. This presentation will. Review sequential logic and the flip-flop.. Introduce the D flip-flop and provide an excitation table and a sample timing analysis.. © 2014 Project Lead The Way, Inc.. Digital Electronics. Flip-Flops & Latches. 2. This presentation will. Review sequential logic and the flip-flop.. Introduce the D flip-flop and provide an excitation table and a sample timing analysis.. A. Yaicharoen. 2. Flip-Flops. A . flip-flop is a bi-stable device: a circuit having 2 stable conditions (0 or 1. ). A flip-flop circuit has two outputs and the outputs of the flip-flop always complement each other, . Read . Kleitz. , Chapter 10.. Homework . #10 and Lab #10 due . next week.. Quiz . next week.. Combinational Logic versus Sequential Logic. A . combinational logic circuit. is a circuit whose output depends only on the circuit’s present inputs. (“Has no memory of the past.”). Chapter 5. Sequential Circuits. Combinational circuits storage (store binary information). Binary information stored defines the state of the sequential circuit. External input present state determine the binary value of outputs and change state in storage elements. Drysdale. Objectives of Lecture. The objectives of this lecture are: . to discuss the difference between . combinational . and. . sequential . logic as well as the difference between . asynchronous. Digital Electronics. Flip-Flops & Latches. 2. This presentation will. Review sequential logic and the flip-flop.. Introduce the D flip-flop and provide an excitation table and a sample timing analysis.. Digital Electronics. Flip-Flops & Latches. 2. This presentation will. Review sequential logic and the flip-flop.. Introduce the D flip-flop and provide an excitation table and a sample timing analysis..