Additional Information Following are the four types of shift registers based on applying inputs and accessing of outputs. Hence Option 2 is correct. Get Started for Free Download App. More Flip-Flop Questions Q1. Match the two lists and choose the correct answer from the code given below: List I List II a i Positive edge-triggered flip-flop b ii T-flip-flop c iii Clocked flip-flop with clear an preset d iv Negative level triggered flip-flop.
If input to T flip flop is Hz signal, then what will be the output signal frequency if four T flip flops are connected in cascade. How many Flip flops circuits are needed to divide by 16? How many flip-flops are needed to divide the input frequency by 40? What does the following flip flop configuration does?
So, we can receive the bits serially from the output of right most D flip-flop. Hence, this output is also called as serial output. We can understand the working of 3-bit SISO shift register from the following table. Therefore, the 3-bit SISO shift register requires five clock pulses in order to produce the valid output. The block diagram of 3-bit SIPO shift register is shown in the following figure. This circuit consists of three D flip-flops, which are cascaded. In this case, we can access the outputs of each D flip-flop in parallel.
So, we will get parallel outputs from this shift register. We can understand the working of 3-bit SIPO shift register from the following table. So, the 3-bit SIPO shift register requires three clock pulses in order to produce the valid output. The clock input is directly connected to all the flip flops but the input data is connected individually to each flip flop through a multiplexer at the input of every flip flop. The output of the previous flip flop and parallel data input are connected to the input of the MUX and the output of MUX is connected to the next flip flop.
Parallel-In Parallel-Out Shift Register PIPO — The shift register, which allows parallel input data is given separately to each flip flop and in a simultaneous manner and also produces a parallel output is known as Parallel-In parallel-Out shift register.
The logic circuit given below shows a parallel-in-parallel-out shift register. The clear CLR signal and clock signals are connected to all the 4 flip flops. In this type of register, there are no interconnections between the individual flip-flops since no serial shifting of the data is required. Data is given as input separately for each flip flop and in the same way, output also collected individually from each flip flop.
Bidirectional Shift Register — If we shift a binary number to the left by one position, it is equivalent to multiplying the number by 2 and if we shift a binary number to the right by one position, it is equivalent to dividing the number by 2. To perform these operations we need a register which can shift the data in either direction.
Bidirectional shift registers are the registers which are capable of shifting the data either right or left depending on the mode selected. If the mode selected is 1 high , the data will be shifted towards the right direction and if the mode selected is 0 low , the data will be shifted towards the left direction.
The logic circuit given below shows a Bidirectional shift register. The input data is connected at two ends of the circuit and depending on the mode selected only one and gate is in the active state.
Shift Register Counter — Shift Register Counters are the shift registers in which the outputs are connected back to the inputs in order to produce particular sequences.
These are basically of two types: Ring Counter — A ring counter is basically a shift register counter in which the output of the first flip flop is connected to the next flip flop and so on and the output of the last flip flop is again fed back to the input of the first flip flop, thus the name ring counter.
The data pattern within the shift register will circulate as long as clock pulses are applied. The logic circuit given below shows a Ring Counter. Since the circuit consists of four flip flops the data pattern will repeat after every four clock pulses as shown in the truth table below: A Ring counter is generally used because it is self-decoding.
No extra decoding circuit is needed to determine what state the counter is in. However, if we need to store up several data bits, we need many flip-flops. A register is a device in digital electronics which is used for storing the data.
Flip-flops play a vital role in designing the most popular shift registers. The set of Flip-flops is nothing but a register, used to store numerous data bits. For example, if a PC is used to store bit of data, subsequently it requires a set of FFs.
And, the inputs, as well as outputs of a register, are serial otherwise parallel depending on the requirement. This article discusses what is a shift register , types, and applications. A register can be defined as when a set of FFs can be connected within the series, the definition of the shift register is when the stored data can be moved in the registers.
Basically, these registers are classified into four types and working of shift registers are discussed below. Because there is just one output, and at a time the data leaves the register one bit in a serial manner.
This circuit can be built with four D-Flip Flops in serially.
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