Johnson counter
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A binary counter uses multiple flip-flops depending on the number of bits required. There are two types of counters: synchronous uses a common clock for all flip-flops while asynchronous only clocks the first stage. A twisted ring or Johnson counter is similar to a ring counter but inverts the output of the last stage and feeds it back to the first stage input. This creates a pattern that is twice the length of the shift register and circulates indefinitely. Twisted ring counters are used in applications like walking LED displays and converting square waves to sine waves.
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David Bovis
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He has an industrial engineering background, majoring in TPS / Lean. David worked his way up from his apprenticeship to earn his seat at the C-suite table. His career spans several industries, including Automotive, Aerospace, Defence, Space, Heavy Industries and Elec-Mech / polymer contract manufacture.
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Session | Own Your Autonomy The Importance of Autonomy in Project Management
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We want everyone to join the journey.
#OwnYourAutonomy is the culmination of 3 years of collaborative exploration within the Leadership Focus Group which is part of the APM People Interest Network. The work has been pulled together using the 5 HPTM速 Systems and the BTFA neuroscience leadership programme.
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Other Link :
1.Introduction to computer network - /slideshow/lecture-notes-introduction-to-computer-network/274183454
2. Physical Layer - /slideshow/lecture-notes-unit-ii-the-physical-layer/274747125
3. Data Link Layer Part 1 : /slideshow/lecture-notes-unit-iii-the-datalink-layer/275288798
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Final year B.Sc. Computer Science students at Alagappa University seeking a solid foundation in Computer Network principles for academic.
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Johnson counter
- 1. Muhammad Anas Sabir Touqeer Abbas Asad Khan DLD presentation
- 2. A binary counter uses 2 or more single clocked flip-flops depending on the number of bits required There are 2 types of counters Synchronous and Asynchronous A asynchronous counter uses a single clock at the first stage But in a synchronous counter all flip-flops are clocked together with a common clock pulse
- 3. Twisted ring is also referred to as Johnsons counter Johnsons or twisted ring counters are just like the ring counters The only difference is that instead of rotating the last output (Q) back to the input the not of the last ouput (^Q) is feeded to the first input
- 5. Instead of a single clears a twisted ring counters have multiple clears. So to start the twisted counter we give every bit an active low clear that is 0 and Every bit shifts right on each clock pulse. But in the end what we shift in the Q0 position is ^Q. So a twisted ring counter moves towards all high bits and then it moves back to all low bits. A 3 bit twisted ring counter has 6 states and a 4 bit has 8 active states. So a twisted ring counter has twice as many states as bit positions.
- 8. It is used in walking LEDs. It is also used to convert square waves into sine waves.
- 9. Johnson Counter is a modified Ring Counter, where the output from the last stage is inverted and fed back as the input to the first stage. Pattern of bits equal in length to twice the length of shift register thus circulates indefinitely. These counters find specialist applications, including those similar to decade counter, digital to analog conversions, etc.
Editor's Notes
- #2: Initial page.