12.27 For each value of N, there exists an exclusive-OR circuit for the linear shift register counter of Figure 12-13 so that the counter cycles through 2N – 1 counts. (a) For N = 3, construct the transition graph for the counter if Sin = Q2e Q1- (The shift register stages are numbered Qo, Q1, Q2 from left to right.) (b) For N = 4, find an exclusive-OR circuit so that the counter cycles through 15 %3D counts.

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**12.27** For each value of \( N \), there exists an exclusive-OR circuit for the linear shift register counter of Figure 12-13 so that the counter cycles through \( 2^N - 1 \) counts.

(a) For \( N = 3 \), construct the transition graph for the counter if \( S_{\text{in}} = Q_2 \oplus Q_1 \). (The shift register stages are numbered \( Q_0, Q_1, Q_2 \) from left to right.)

(b) For \( N = 4 \), find an exclusive-OR circuit so that the counter cycles through 15 counts.
Transcribed Image Text:**12.27** For each value of \( N \), there exists an exclusive-OR circuit for the linear shift register counter of Figure 12-13 so that the counter cycles through \( 2^N - 1 \) counts. (a) For \( N = 3 \), construct the transition graph for the counter if \( S_{\text{in}} = Q_2 \oplus Q_1 \). (The shift register stages are numbered \( Q_0, Q_1, Q_2 \) from left to right.) (b) For \( N = 4 \), find an exclusive-OR circuit so that the counter cycles through 15 counts.
**FIGURE 12-13**  
**General Shift Register Counter**  
© Cengage Learning 2014

**Diagram Explanation:**

The diagram illustrates a general shift register counter, highlighting its main components and their interactions.

- **N-Bit Shift Register:** This is the main component of the counter which holds and shifts the bits. It receives input serially and shifts the bits according to the clock (Clk) pulses.

- **SI (Serial Input):** This is the input line where bits are fed into the shift register.

- **Clk (Clock):** The clock signal input that controls the timing of the shifts in the register.

- **Gate Logic:** This component processes the output (N) from the shift register. It performs a logical operation that determines the next state of the system or provides additional outputs.

- **N (Output/Feedback):** This line carries the output from the shift register to the Gate Logic, creating a feedback loop that is essential for counting or other sequential operations.

The diagram forms a closed loop indicating continuous operation where the output can influence future states of the shift register through the gate logic.
Transcribed Image Text:**FIGURE 12-13** **General Shift Register Counter** © Cengage Learning 2014 **Diagram Explanation:** The diagram illustrates a general shift register counter, highlighting its main components and their interactions. - **N-Bit Shift Register:** This is the main component of the counter which holds and shifts the bits. It receives input serially and shifts the bits according to the clock (Clk) pulses. - **SI (Serial Input):** This is the input line where bits are fed into the shift register. - **Clk (Clock):** The clock signal input that controls the timing of the shifts in the register. - **Gate Logic:** This component processes the output (N) from the shift register. It performs a logical operation that determines the next state of the system or provides additional outputs. - **N (Output/Feedback):** This line carries the output from the shift register to the Gate Logic, creating a feedback loop that is essential for counting or other sequential operations. The diagram forms a closed loop indicating continuous operation where the output can influence future states of the shift register through the gate logic.
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