PRBS sequences find their application in the field of information management such as telecommunication, data encryption, system simulation, statistical correlation methods, and the spectroscopy of flight times (Awschalom, Loss & Samarth, 2002).

The practical process for generating the Pseudorandom binary sequences can be implemented through shift registers that can provide linear feedbacks (Horowitz and Hill, 1989). Examples of the sequences that generate polynomials are stated below:

The PISO shift register (Parallel-in to Serial-out) operates in an opposite direction as the SIPO register. The shift register receives data in parallel form. All the inputs of the data bits enter the parallel input pins simultaneously. The parallel pins are labeled as P1, P2, P3, and P4in the PISO shift register (Hetzel, 1988). The reading of the input data then takes place in sequential order inside the PISO register in a shift-right mode (Maini, 2007). This takes place at the Q data output pins of the register. Q represents the available data at the input pins P1 to P4. The output of the data comes out 1 bit each time on every clock cycle (Crowell & Press, 2002). As the input is in parallel format, the output of the data at Q is in serial format. Fundamentally, in the PISO system, there is no need for generating a clock pulse (Brown et al, 1992). The clock pulse is already present in the register for parallel loading. However, during the unloading of the data, the register requires the generation of 4 clock pulses (Predko and Predko, 2004).

The PISO shift register transforms parallel input data into serial output data whose size fully depends on the size of the input signals. For example, the input can be 8 – bit data that can be converted into serial formats (Zvi & Niraj, 2009). It multiplexes multiple input data into one serial stream of output that can move directly to a computer or flow in a communication line.