Linear-feedback shift register (LFSR) In progress
Four flip-flops and one XOR that step through every nonzero 4-bit value, fifteen in all. The taps, the seed a reset must load, and the value it cannot leave.
Tagged shift-register
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Shift register In progress
Four flip-flops in a row that take one bit per edge and hold the last four side by side. Serial in, parallel out, and what the order of four lines decides.