The answer is that they actually only offer the serial-in, parallel-out shift register, as long as it has no more than 8-bits. Why not just offer the serial-in, parallel-out shift register? If a serial-in, parallel-out shift register is so similar to a serial-in, serial-out shift register, why do manufacturers bother to offer both types?

The last stage (Q D above) serves as SO and is cascaded to the next package if it exists. After a number of clocks equal to the number of stages, the first data bit in appears at SO (Q D) in the above figure.

Serial data shifts in at SI (Serial Input). It looks like a serial-in, serial-out shift register with taps added to each stage output. 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 ( Q A Q B Q C Q D). 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. If four data bits are shifted in by four clock pulses via a single wire at data-in, below, the data becomes available simultaneously on the four Outputs Q A to Q D after the fourth clock pulse. Therefore, a serial-in, parallel-out shift register converts data from serial format to parallel format.Īn Example of Using Serial-in, Parallel-out Shift Register It is different in that it makes all the internal stages available as outputs. A serial-in, parallel-out shift register is similar to the serial-in, serial-out shift register in that it shifts data into internal storage elements and shifts data out at the serial-out, data-out, pin.

Parallel to serial simulink