Shift Registers in Digital Systems
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Questions and Answers

What does Figure(2) illustrate about shift registers?

  • Types of clock pulses
  • Control signals in shift registers
  • Types of data movement (correct)
  • Size of shift registers

    • How many basic types of shift registers are mentioned in the text?

  • Five
  • Four (correct)
  • Three
  • Two

    • In a Serial in-Serial out shift register, how is data accepted?

  • Serially, one bit at a time on a single line (correct)
  • In parallel, multiple bits at a time on multiple lines
  • Only at the output stage
  • Randomly, with no specific order

    • What happens when the first clock pulse is applied in a Serial in-Serial out shift register?

    <p>FF0 is reset</p> Signup and view all the answers

    How many bits of data can a 4-stage serial in-serial out shift register store?

    <p>Four bits</p> Signup and view all the answers

    What does Figure(3) depict in relation to shift registers?

    <p>Entry of data into a 4-bit serial in-serial out shift register</p> Signup and view all the answers

    What is the primary purpose of a shift register?

    <p>To store and transfer data</p> Signup and view all the answers

    How is data stored in a shift register?

    <p>By setting or resetting individual flip-flops</p> Signup and view all the answers

    What determines the storage capacity of a shift register?

    <p>The number of stages (flip-flops) in the register</p> Signup and view all the answers

    How is data moved within a shift register?

    <p>By applying a sequence of clock pulses</p> Signup and view all the answers

    What distinguishes a register from a counter?

    <p>A register has no characteristic internal sequence of states</p> Signup and view all the answers

    What is the primary function of a flip-flop in a shift register?

    <p>To store a single bit of data</p> Signup and view all the answers

    What enables each data bit to be applied to the D input of its respective flip-flop?

    <p>Enabled gates G1 through G4</p> Signup and view all the answers

    What happens when a clock pulse is applied to the flip-flops in this circuit?

    <p>The flip-flops set based on the value of D input</p> Signup and view all the answers

    What is the sequence of bits shifted into the register in the example?

    <p>1010</p> Signup and view all the answers

    Which gates enable the data bits to shift right from one stage to the next in this circuit?

    <p>Gates G5 through G7</p> Signup and view all the answers

    How many clock pulses are required to completely shift the bits out of the register?

    <p>4</p> Signup and view all the answers

    What function do the OR gates serve in this shift register circuit?

    <p>Enable parallel data entry operation</p> Signup and view all the answers

    What happens to the bits in the register during the shifting out process?

    <p>They are replaced with zeros as they are shifted out.</p> Signup and view all the answers

    Why does FF0 have a single AND to disable the parallel input D0?

    <p>Because of the presence of serial data input</p> Signup and view all the answers

    Which flip-flop output does the data get shifted out from?

    <p>Q3</p> Signup and view all the answers

    What is the purpose of the shift register in this context?

    <p>To temporarily store data bits</p> Signup and view all the answers

    What gets loaded into the register on clock pulse 1 according to the provided text?

    <p>$1010$</p> Signup and view all the answers

    What is the significance of the clock pulses in the operation of the shift register?

    <p>They control the shifting of data into and out of the register.</p> Signup and view all the answers

    What is the purpose of the ̅̅̅̅̅̅̅̅̅ input in the 74HC165 shift register?

    <p>To enable parallel loading of data into the register</p> Signup and view all the answers

    How are the flip-flops in the 74HC165 set and reset during parallel loading?

    <p>They are asynchronously set by a LOW from the upper NAND gate and reset by a LOW from the lower NAND gate</p> Signup and view all the answers

    What is the function of the CLK INH input in the 74HC165?

    <p>To inhibit the clock signal</p> Signup and view all the answers

    How are the serial data outputs of the 74HC165 represented?

    <p>Q7 and ̅̅̅̅</p> Signup and view all the answers

    What is the difference between the 74HC165 and the synchronous parallel loading method discussed earlier?

    <p>All of the above</p> Signup and view all the answers

    Based on the given information, what is the purpose of the SER input in the 74HC165?

    <p>To load serial data into the register</p> Signup and view all the answers

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