Bidirectional Shift Register | Electrical4U

 

applications of bidirectional shift registers

Jan 06,  · Applications of Shift Registers Delay Lines of Shift Registers. Shift registers of Serial In Serial Out (SISO) Data Format Converters of Shift Registers. Data Processors of Shift Registers. Earlier computer systems used shift registers to process Counters of Shift Registers. Sep 03,  · Julian's Logic: The 74HC Shift Register - Duration: Julian Ilett 88, views. May 15,  · Bidirectional shift registers are the storage devices which are capable of shifting the data either right or left depending on the mode selected. Figure 1 shows an n-bit bidirectional shift register with serial data loading and retrieval capacity. Initially all the flip-flops in the register are reset by driving their clear pins high.


Shift Registers - Types , Applications


Flip flops can store a single bit of binary data i. But if we need to store multiple bits of data, we need multiple flip flops. As a single flip flop is used for one bit storage, n flip flops are connected in an order to store n bits of data. In digital electronics, a Register is a device which is used to store the information. Flip flops are use in constructing registers. Register is a group of flip flops used to store multiple bits of data, applications of bidirectional shift registers.

For example, if a computer is to store 16 bit data, then it needs a set of 16 flip flops. The input and outputs of a register are may be serial or parallel based on the requirement.

When a number of flip flops are connected in series, this arrangement is called a Register. A shift register is a sequential circuit which stores the data and shifts it towards the output on every clock cycle. Back to top. The input to this register is given in serial fashion i. The data can be shifted only left or shifted only right. As the data is fed from right as bit by bit, the shift register shifts the data bits to left.

A 4-bit SISO shift register consists of 4 flip flops and only three connections. This one is the simplest register among the four types. As the clock signal is connected to all the 4 flip flops, the serial data is connected to the left most or right most flip flop, applications of bidirectional shift registers. The output of the first flip flop is connected to the input of the next flip flop and so on.

The final output of the shift register is collected at the outmost flip flop. In the above diagram, applications of bidirectional shift registers, we see the shift right register; feeding the serial data input from the left side of the flip flop arrangement.

In this shift register, when the clock signal is applied and the serial data is given; only one bit will be available at output at a time in the order of the input data. The use of Applications of bidirectional shift registers shift register is to act as temporary data storage device. But the main use of a SISO is to act as a delay element. The clear CLR signal is connected in addition to clock signal to all the 4 flip flops in order to RESET them and the serial data is connected to the flip flop at either end depending on shift left register or shift right register.

All the flip flops are connected with a common clock. Unlike the serial in serial out shift registers, applications of bidirectional shift registers output of Serial in Parallel out SIPO shift register is collected at each flip flop. Q1, Q2, Q3 and Q4 are the outputs of first, second, third and fourth flip flops, respectively. The main application of Serial in Parallel out shift register is to convert serial data into parallel data.

Hence they are used in communication lines where demultiplexing of a data line into several parallel line is required. Parallel in Serial out shift register The input to this register is given in parallel i. The clock input is directly connected to all the flip flops but the input data is connected individually to each flip flop through a mux multiplexer at input of every flip flop. Here D1, D2, D3 and D4 are the individual parallel inputs to the shift register.

Applications of bidirectional shift registers this register the output is collected in serial. 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.

Hence they are used in communication lines where a number of data lines are multiplexed into single serial data line. In this register, the input is given in parallel and the output also collected in parallel, applications of bidirectional shift registers. The clear CLR signal and clock signals are connected to all the 4 flip flops. Data is given as input separately for each flip flop and in the same way, output also collected individually from each flip flop.

The above diagram shows the 4 stage parallel in parallel out register. There are no interconnections between any of the four flip flops.

It is designed by connecting the output of the first flip flop to its next one and the output of last flip flop applications of bidirectional shift registers connected again to the first one as input, applications of bidirectional shift registers, like a feedback path. The first flip flop is connected to high input i. Finally, the output of last flip flop is fed back as input to first flip flop. When we apply the first clock pulse to the arrangement; the second stage input changes to 1 and rest inputs are 0.

In this way, the input 1 is rotated around the ring. Apart from the above register types we have the other type of registers also. They are given below. If we shift a binary number to left by one position, this operation is equivalent to multiplying the original number by 2, applications of bidirectional shift registers. Similarly, if we shift a binary number to right by one position, this operation is equivalent to dividing the original number by 2.

Hence in order to perform these mathematical operations, we need a shift register that can shift the bits in either direction. This can be achieved by Bidirectional Shift Register.

The entire set of shift registers mentioned above are Unidirectional Shift Registers i. This register has mode input for right shift or left shift, a clock signal and two serial Data lines one each for input and output. The mode input will control the shift left and shift right operations. If the mode input is high 1 then the data will be shifted right. Similarly, if the mode input is low 0 then the data will be shifted left. The circuit of a bidirectional shift register using D flip flops is applications of bidirectional shift registers below.

The input serial data is connected at two ends of the circuit to AND gates 1 and 8. Base on the mode input being high or low, only one AND gate either 1 or 8 is in active state. It means that, the universal shift register can store the data in parallel and can transmit the data in parallel. In the same manner the data can stored and transmitted by serial path through shift left and shift right operations. It is called Universal Shift Register as it can be used for left shift, right shift, serial to serial, serial to parallel, parallel to serial and parallel to parallel operations.

Observe the below logic gate representation of universal shift register. The mode input is directly connected to MUX input and the reversed mode input using NOT gate is connected to the inputs of upper stage flip flops. It has a serial input pin to feed the data into the register for both left shift and right shift. The logic diagram of a 4 bit universal shift register is shown below. Shift registers are used in computers as memory elements. All the digital systems need to store large amount of data, in an efficient manner; there we use storage elements like RAM and other type of registers, applications of bidirectional shift registers.

Many of the digital system operations like division, multiplication are performed by using registers. The data is transferred through serial shift registers and other type. Introducing Delay line is the most important use of shift registers. A serial in serial out shift register applications of bidirectional shift registers used to produce time delay, to digital circuits, applications of bidirectional shift registers. The time delay can be calculated by using below formula.

The amount of applications of bidirectional shift registers delay is controlled flip flops in the shift register or the clock signal frequency. Your email address will not be published. Table of Contents. Comments finally………understood the whole concept of shift registers!!!!!!!!! Leave a Reply Cancel reply Your email address will not be published.

 

Shift Register : Different Types, Counters and Applications

 

applications of bidirectional shift registers

 

Jan 15,  · Applications of Shift registers 1. Parallel to serial conversion, where they are used to reduce the number of wires, 2. IO expansion for microcontrollers. In modern day electronics, 3. They are used in state registers which are used in sequential devices. 4. One other main application is. Sep 03,  · Julian's Logic: The 74HC Shift Register - Duration: Julian Ilett 88, views. Jan 06,  · Applications of Shift Registers Delay Lines of Shift Registers. Shift registers of Serial In Serial Out (SISO) Data Format Converters of Shift Registers. Data Processors of Shift Registers. Earlier computer systems used shift registers to process Counters of Shift Registers.