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![]() ![]() ![]() So, that's your use case for serial-in, parallel-out, registers with a feedback. You can't have cheap RAM without these! In fact, I've never seen "parallel in, parallel out" shift registered being called that – usually, these are just called buffer or register.Ī lot of the math underlying error correction, checksumming, (pseudo)random number generation or cryptography relies on evaluation of polynomials over finite fields – which are typically implemented in hard- or software as Linear-Feedback Shift Registers. You need a FIFO buffer – that gives you the need for your SISO and PIPO registers. Things don't always work at exactly the same, constant speed. That gives you the need for Serial-to-parallel and parallel-to-serial shift registers. Every digital link that is serial, be it just a UART, an SPI line, or PCIe, goes into some digital component that most likely would to think in words (like: bytes). ![]()
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