Q4Digital Electronics
Question
4 marks
Describe shift registers. Write the application of shift registers.
Answer
A shift register is a sequential circuit that shifts stored bits one position per clock cycle; types include SISO, SIPO, PISO, and PIPO with applications in serial communication and data conversion.
- SISO (Serial In Serial Out): data enters and exits serially; used as delay line
- SIPO (Serial In Parallel Out): data enters serially, all bits available in parallel; serial-to-parallel converter
- PISO (Parallel In Serial Out): data loaded in parallel, shifted out serially; parallel-to-serial converter
- PIPO (Parallel In Parallel Out): data loaded and read in parallel; used as buffer register
- Serial communication interfaces (UART, SPI, I2C) - parallel-to-serial and serial-to-parallel conversion
- Ring counters and Johnson counters
- Digital delay lines (SISO)
- CRC generation and checking
- Sequence generators
- Data storage and temporary buffering