Question

Which of the following is a function of shift register?

• A. \( \text{To convert digital information into analog signals} \)
• B. \( \text{To control current levels according to data pulses} \)
• C. \( \text{To translate serial digital information into parallel or parallel digital information into serial data} \)
• D. \( \text{To control voltage levels according to clock pulses} \)

Hint:

Shift registers are fundamental building blocks in digital electronics. Their ability to convert between serial and parallel data formats makes them crucial for various applications, including data transmission (e.g., converting parallel data from a processor to serial data for a communication bus), data storage, and basic arithmetic operations (like multiplication and division using bit shifts). Remember their classifications: Serial-In/Serial-Out (SISO), Serial-In/Parallel-Out (SIPO), Parallel-In/Serial-Out (PISO), and Parallel-In/Parallel-Out (PIPO).

Answer 1

The Correct Option is C

To solve this problem, we need to identify the correct function of a shift register from the given options.

1. Understanding Shift Registers:

- A shift register is a type of sequential logic circuit that can store and manipulate data in the form of a binary sequence. It typically consists of flip-flops connected in series, where each flip-flop holds one bit of data, and the data is shifted from one flip-flop to the next on each clock pulse.

- Shift registers are commonly used for converting data between serial and parallel formats, making them essential for data transfer and storage in digital systems. Specifically, a shift register can:

• Shift data: The data can be shifted either left or right across the register.
• Store data: Each bit in the register can hold data and be accessed serially or in parallel.
• Convert serial to parallel or parallel to serial: This is one of the primary functions of a shift register, allowing it to either collect data in parallel and output it serially or vice versa.

2. Analyzing the Options:

- Option 1: "To convert digital information into analog signals" – This is incorrect. Shift registers deal with digital signals, not analog signals.

- Option 2: "To control current levels according to data pulses" – This is not the primary function of a shift register. Shift registers are used for data storage and shifting, not for controlling current levels.

- Option 3: "To translate serial digital information into parallel or parallel digital information into serial data" – This is correct. This is exactly what shift registers are designed to do, making them crucial for serial-to-parallel and parallel-to-serial data conversions.

- Option 4: "To control voltage levels according to clock pulses" – This is also not the primary function of a shift register, which focuses on shifting and storing data, not directly controlling voltage levels.

Final Answer:

The correct function of a shift register is "To translate serial digital information into parallel or parallel digital information into serial data".