digital lock using jk flip flops multisim

Let us see the working of 3-bit SISO shift register by sending the binary information “011” from LSB to MSB serially at the input.Īssume, initial status of the D flip-flops from leftmost to rightmost is $Q_=011$. Hence, this output is also called as serial output. So, we can receive the bits serially from the output of right most D flip-flop. For every positive edge triggering of clock signal, the data shifts from one stage to the next. Hence, this input is also called as serial input. In this shift register, we can send the bits serially from the input of left most D flip-flop. All these flip-flops are synchronous with each other since, the same clock signal is applied to each one. That means, output of one D flip-flop is connected as the input of next D flip-flop. This block diagram consists of three D flip-flops, which are cascaded. The block diagram of 3-bit SISO shift register is shown in the following figure. The shift register, which allows serial input and produces serial output is known as Serial In – Serial Out (SISO) shift register. Serial In − Serial Out (SISO) Shift Register Parallel In − Parallel Out shift register.Parallel In − Serial Out shift register.Serial In − Parallel Out shift register.Following are the four types of shift registers based on applying inputs and accessing of outputs. An ‘N’ bit shift register contains ‘N’ flip-flops. If the register is capable of shifting bits either towards right hand side or towards left hand side is known as shift register. The group of flip-flops, which are used to hold (store) the binary data is known as register. In order to store multiple bits of information, we require multiple flip-flops. Unlike the Master-Slave design, which needs a complete pulse, you can also build an edge-triggered design that triggers from a rising edge ↑ or a falling edge ↓.We know that one flip-flop can store one-bit of information. That’s why this configuration is called pulse-triggered JK Flip-Flop. So this circuit requires a complete pulse (0→1 →0) in order to change the output. Once the clock signal produces a falling edge ↓, a change from 1 to 0 (1→0), it triggers the slave section, causing the Q output to reflect the master’s output value.

These signals are connected to the slave section, but this doesn’t trigger on the rising edge because the clock has been inverted. As a result, the value of the outputs in this section changes. As soon as the clock makes a rising edge ↑, which is a change from 0 to 1 (0→1), it triggers the master section.

Digital lock using jk flip flops multisim