Quantcast
Figure 3-26. Ring counter: A. Logic diagram; B. Timing diagram.

Share on Google+Share on FacebookShare on LinkedInShare on TwitterShare on DiggShare on Stumble Upon
Custom Search
 
  
 
3-28 then only one device may be HIGH at one time. As the clock, or input, signal is received, the specified state will shift to the next device at a rate of 1 shift per clock, or input, pulse. Figure 3-26, view A, shows a typical four-stage ring counter. This particular counter is composed of R-S FFs. J-K FFs may be used as well. Notice that the output of each AND gate is input to the R, or reset side, of the nearest FF and to the S, or set side, of the next FF. The Q output of each FF is applied to the B input of the AND gate that is connected to its own R input. Figure 3-26. —Ring counter: A. Logic diagram; B. Timing diagram. The circuit input may be normal CLK pulses or pulses from elsewhere in the equipment that would indicate some operation has been completed. Now, let’s look at the circuit operation and observe the signal flow as shown in figure 3-26, view B. For an initial condition, let’s assume that the output of FF1 is HIGH and that the input and FF2, FF3, and FF4 are LOW. Under these conditions, lamp A will be lit; and lamps B, C, and D will be extinguished. The HIGH from FF1 is also applied to the B input of AND gate 1. The first input pulse is applied to the A input of each of the AND gates. The B inputs to AND gates 2, 3, and 4 are LOW since the outputs of FF2, FF3, and FF4 are LOW. AND gate 1 now has HIGHs on both inputs and produces a HIGH output. This HIGH simultaneously resets FF1 and sets FF2. Lamp A then goes out, and lamp B goes on. We now have a HIGH on AND gate 2 at the B input. We also have a LOW on AND gate 1 at input B.


Electrical News
Can China Mobile Outpace 'Free' Mobile Apps?
Skype's co-founder once predicted that telephones would eventually become just...
eetimes.com
Pointers, Functions, Pointers to Functions, Eeek!
Max is wearing his sad face, because he cannot wrap...
eetimes.com
Altera's FPGA DSP Goes Hardcore
Having hardened floating-point DSP blocks in FPGAs opens the door...
eetimes.com
Scale-Out Storage Has Limits
Disk may scale as your storage needs increase, but what...
eetimes.com
Startup Makes First MEMS Bio-Tag Sales
Bluechiip, an Australian startup, has started selling its own passive...
eetimes.com
Max's BADASS Display, Part 4
Before Max actually starts to create the front panel for...
eetimes.com
Report: Magnetic RAM Set for 50% CAGR
In the next five years, magnetic RAM is expected to...
eetimes.com
Launching today: Freeboard, a Dropbox-like version for the IoT
It’s no secret that developing apps for the Internet of...
wsnblog.com
Bluetooth LE Promises Fewer Cables, Less Weight in Cars
Bluetooth Low Energy technology is about to get exploited for...
eetimes.com
Wearable Contest Takes to the Air
Wearable World, a San Francisco-based wearable Internet of Things incubator/accelerator,...
eetimes.com
OpenSSL Shows Cost of 'Free'
The Heartbleed bug may be a media frenzy over a...
eetimes.com
Samsung Attacks: Case Against Apple Begins
Samsung's infringement complaint against Apple centers on smartphone technology for...
eetimes.com
Cadence to Acquire Jasper
The merger will create the most comprehensive set of verification...
eetimes.com
EEVblog #606 – Mailbag
Dave flips the bird. A 1970′s Mattel car racing game....
eevblog.com
Nike FuelBand Layoffs: A Pivot in Wearables?
Nike, a distant third in a three-company race to sell...
eetimes.com
Neuromorphic Roadmap Plots Analog Path
Human-brain-like cognitive computers will employ mixed-signal neuromorphic SoCs, according to...
eetimes.com
Google's Project Tango Helps Robots Fly on ISS
Google's experimental, 3D-navigating Project Tango will form the brains of...
eetimes.com
SSD Survey Highlights Misconceptions About Encryption & Performance
Most respondents of an SNIA survey employ SSDs in storage...
eetimes.com
FPGAs as ASIC Alternatives: Past & Future
From the 28nm technology node going forward, the FPGA industry...
eetimes.com
BMW Has Most Advanced Connectivity
In the rush to create a better connected car, a...
eetimes.com
   


Privacy Statement - Copyright Information. - Contact Us

comments powered by Disqus

Integrated Publishing, Inc.
9438 US Hwy 19N #311 Port Richey, FL 34668

Phone For Parts Inquiries: (727) 755-3260
Google +