23 - This problem can be solved by using edge triggering...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
EE200(class 11-1) Prof. M.M. Dawoud 106 EE200 DIGITAL LOGIC CIRCUIT DESIGN Class Notes CLASS 11-1 The material covered in this class will be as follows: Triggering of flip-flops. Edge triggered flip-flops. Master-slave D flip-flop. Positive edge triggered flip-flop. Characteristic tables. Triggering Of Flip-Flops The D latch is triggered with clock pulses when the clock goes from o to 1. The outputs can change as long as the clock is at level 1. This type of triggering is called “Level triggering”. The problem with level triggering is that the outputs of the latches change all the time while the trigger is 1. It becomes difficult to predict the final outputs of the latches in the sequential circuit and consequently, common clock source cannot be applied to all the latches in the circuit at the same time.
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 2
Background image of page 3
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: This problem can be solved by using edge triggering instead of level triggering. There are two type of edge triggering: 1. Positive edge triggering. 2. Negative edge triggering. These are shown in the following Figure. EE200(class 11-1) Prof. M.M. Dawoud 107 Level Triggering Positive Edge Triggering Negative Edge Triggering Edge Triggered D Flip-Flops There are two types of edge triggered flip-flops: 1. Master-slave flip-flop. 2. Positive edge triggered D flip-flop. The Master-Slave D Flip-Flop D Latch (Master) D Latch (Slave) D C D C D CLK Q Y EE200(class 11-1) Prof. M.M. Dawoud 108 The following timing diagram shows how the output Q of the master-slave D flip-flop changes on he negative edge of the clock pulse. Positive Edge Triggered Flip-Flop D CL Y Q...
View Full Document

This note was uploaded on 05/21/2010 for the course EE EE200 taught by Professor Prof.ahmed during the Spring '09 term at King Fahd University of Petroleum & Minerals.

Page1 / 3

23 - This problem can be solved by using edge triggering...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online