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16.10. EXERCISES

  1. Design a PIPO, which is a 4-bit buffer register with parallel in (loading) and parallel output (storing). [Hint: refer figure 16.2(a), use the AND buffers at both the ends.]

  2. Show the state diagram from a state table corresponding to a SIPO. (Hint: Refer sate table at Table 16.2).

  3. Design a multipurpose behavior of a left shift register, which shift left when channel inputs, are 01 and circularly shift left when 10, synchronous clear when 11 and no-shift when 00. (Hint: Refer Example 16.8).

  4. Solve the problem in Example 16.2 once again for a left-shift register.

  5. Design a SISO circular left shift register.

  6. Draw and compare the state diagrams of (i) a SIPO of 4 bits (ii) a 4-stage ripple counter.

  7. Give a state table and state diagram of a binary synchronous counter.

  8. Give a state table and state diagram of a asynchronous down modulo 6 counter.

  9. How much is the time interval for Qs to stabilize in a sixteen bit asynchronous counter? Assume flip flop propagation delays = 10 ns.

  10. How will you make circuit of modulo-7 counter?

  11. Show state diagram of a modulo-4 counter?

  12. What should be the count value for a 8-bit counter to time out in 1 ms if input clock pulses at 100 ms intervals?

  13. Show the timing diagram of a ring counter.

  14. Show the circuit of a 3-bit Johnson counter.

  15. Show the timing diagram of a Johnson counter modified for maximum 7-sequence clock generator.


  

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