There is only one clock source and all the flip-flops receive the same clock pulse, therefore we tie them to a single line as well.Ī test implementation of this circuit could be through using the 4013 IC, which has dual D-type flip-flops therefore two of these ICs would be required to implement a 4-bit serial to parallel shift register. It is customary to tie the RESET control signals together so that a single command logic performs this function simultaneously on all stages. The above details of the serial-in, parallel-out shift register are fairly simple. Let’s illuminate four LEDs (light emitting diodes) with the four outputs ( QA QB QC QD ). Rising edge triggered device, and the data at its input transfers to the output only on the rising edge of the clock pulse. The practical application of the serial-in, parallel-out shift register is to convert data from serial format on a single wire to parallel format on multiple wires. How to Build a Register Circuit with a 4094 Chip. And this is how a 74HC165 register operates. module Parallel2Serial (Parin, clk, serout,reset, load, eoc) input 3:0 Parin wire 3:0 Parin input reset wire reset input clk wire clk output serout output eoc reg eoc input load wire load reg serout reg 3:0 bufferreg always (posedge clk) begin //assign bufferreg Parin if. But this circuit goes to show how a parallel-load, serial-out register works. Data communications from a USB port or a SATA hard disk drive are in serial, and there is usually a controller IC that converts this data into parallel before sending to the microprocessor. The real function would be either for parallel-serial conversion of data or to form a parallel-in, parallel out circuit. Shift registers are widely in use in modern digital electronics. A 4-bit serial-to-parallel shift register is one of the simplest types of circuits utilising four D-type flip-flops. A serial to parallel converter is a digital circuit where we feed the input data serially, and read the outputs in parallel fashion.

Parallel to serial converter circuit