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Synchronous Counters Synchronous Counters

Synchronous Counters - PowerPoint Presentation

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Synchronous Counters - PPT Presentation

2014 Project Lead The Way Inc Digital Electronics Synchronous Counter 2 This presentation will Define synchronous counters Provide examples of 3Bit and 4Bit synchronous up counters ID: 563623

edge clock toggles falling clock edge falling toggles amp counters bit synchronous counter synch circuit asynchronous theory provide examples

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Slide1

Synchronous Counters

© 2014 Project Lead The Way, Inc.

Digital ElectronicsSlide2

Synchronous Counter2

This presentation willDefine synchronous counters.

Provide examples of 3-Bit and 4-Bit synchronous up counters.Provide examples of 3-Bit and 4-Bit synchronous down counters.Slide3

Synchronous CountersAll flip-flops are simultaneously clocked by an external clock. Synchronous counters are faster than asynchronous counters at simultaneous clocking.Synchronous counters do not suffer from the ripple effect that asynchronous counters do.Synchronous counters require more logic than asynchronous counters.3Slide4

3-Bit Synch Up Counter: Theory401

2

34

5

6

7

0

Q2

Q1

Q0

CLOCK

Q0 : Toggles On Falling Edge of CLOCK

Q1 : Toggles On Falling Edge of CLOCK & Q0=1

Q2 : Toggles On Falling Edge of CLOCK & Q0=1 & Q1=1Slide5

3-Bit Synch Up Counter: Circuit5

Toggles On:

Falling Edge of CLOCK AND Q0=1Toggles On: Falling Edge of CLOCK AND Q0=1 & Q1=1

Toggles On:

Falling Edge of CLOCKSlide6

3-Bit Synch Up Counter: Timing6

Q2

Q1Q0CLK

“0”

“2”

“4”

“6”

“1”

“3”

“5”

“7”Slide7

4-Bit Synch Up Counter: Circuit7

Toggles On:Falling Edge of CLOCK AND Q0=1

Toggles On: Falling Edge of CLOCK AND Q0=1 & Q1=1

Toggles On:

Falling Edge of CLOCK

Toggles On:

Falling Edge of CLOCK AND Q0=1 & Q1=1 & Q2=1Slide8

3-Bit Synch Down Counter: Theory8

Q0 : Toggles On Falling Edge of CLOCK

Q1 : Toggles On Falling Edge of CLOCK & Q0=0

Q2 : Toggles On Falling Edge of CLOCK & Q0=0 & Q1=0

7

6

5

4

3

2

1

0

7Q2Q1Q0CLOCKSlide9

3-Bit Synch Down Counter: Circuit9

Toggles On:

Falling Edge of CLOCK AND Q0=0Toggles On: Falling Edge of CLOCK AND Q0=0 & Q1=0

Toggles On:

Falling Edge of CLOCKSlide10

4-Bit Synch Down Counter: Circuit10

Toggles On:

Falling Edge of CLOCK AND Q0=0Toggles On: Falling Edge of CLOCK AND Q0=0 & Q1=0

Toggles On:

Falling Edge of CLOCK

Toggles On:

Falling Edge of CLOCK AND Q0=0 & Q1=0 & Q2=0