Digital fundamentals 10th edition chapter 8
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# Two configurations of the 74LS93A asynchronous counter. # Note that it is momentarily in state 3 which causes it to clear.
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# LSB MSB Qto Dputs D flip-flop in toggle mode Summary CLR CLK LSB MSB The sequence is 0 – 2 – 1 – (CLR) (repeat). Can you figure out the sequence? The next slide shows the scope. The counter in this slide is a Multisim simulation of one described in the lab manual. Waveforms are on the following slide.ĬLR Summary Asynchronous Counter Using D Flip-flops D flip-flops can be set to toggle and used as asynchronous counters by connecting Qback to D. Other truncated sequences can be obtained using a similar technique. The flip-flops are trailing-edge triggered, so clocks are derived from the Q outputs. Summary Asynchronous Decade Counter This counter uses partial decoding to recycle the count sequence to zero after the 1001 state. # Propagation delays in a 3-bit asynchronous (ripple-clocked) binary counter. The resulting sequence is that of an 3-bit binary up counter. The leading edge of Q 0 is equivalent to the trailing edge of Q 0. The following stage is triggered from Q 0. Summary Three bit Asynchronous CounterĠ 0 0 0 1 1 1 1 0 Notice that the Q 0 output is triggered on the leading edge of the clock signal. HIGH Waveforms are on the following slide. It uses J-K flip-flops in the toggle mode. Summary Three bit Asynchronous Counter The three-bit asynchronous counter shown is typical. Subsequent stages derive the clock from the previous stage.
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Summary Counting in Binary In an asynchronous counter, the clock is applied only to the first stage. 0 0 0 0 0 1 0 1 0 0 1 1 1 0 0 1 0 1 1 1 0 1 1 1 The next bit changes on every fourth number. The next bit changes on every other number. © 2008 Pearson Education As you know, the binary count sequence follows a familiar pattern of 0’s and 1’s as described in Section 2-2 of the text. Deliverable Length: 5-7 pages minimum 5 academic/professional references published in last 5 yrs.Digital Fundamentals Tenth Edition Floyd Chapter 8 Asynchronous Counters Analyze the current trends in patient data capture and information sharing among health care providers, assessing their impact on your organization's operations. Write an executive summary that examines the compliance procedures and practice guidelines that these organizations would need to establish to achieve optimum operational effectiveness while complying with federal, state, and local laws governing patient information security and records retention. You have been asked to review your company's protocols on sharing and receiving patient information for outside providers to ensure that your organization is in compliance with the latest standards and regulations. Your organization has a very important relationship with a diagnostics center in particular where you frequently need to share patient information such as lab results, X-rays, and other diagnostic information. Health Info Individual Project: 8/27 You work for a health care organization that frequently needs to share information with other providers. The voltages represent numbers in the binary A typical CD playerĪccepts digital data from the CD drive and converts it to anĭigital electronics uses circuits that have two states, whichĪre represented by two different voltage levels called HIGHĪnd LOW. Many systems use a mix of analog and digital electronics to © 2009 Pearson Education, Upper Saddle River, NJ 07458. Analog systems can generally handle higherġ 2 3 4 5 6 7 8 9 10 11 12 1 2 3 4 5 6 7 8 9 10 11 12ĭigital systems can process, store, and transmit data moreĮfficiently but can only assign discrete values to each point. Most natural quantities that we see are analog and varyĬontinuously.