A shift register is a type of digital circuit using a cascade of flip-flops where the output of one flip-flop is connected to the input of the next. They share a single clock signal, which causes the data stored in the system to shift from one location to the next. By connecting the last flip-flop back to the first, the data can cycle within the shifters for extended periods, and in this configuration they were used as computer memory, displacing delay-line memory systems in the late 1960s and early 1970s.
In most cases, several parallel shift registers would be used to build a larger memory pool known as a "bit array". Data was stored into the array and read back out in parallel, often as a computer word, while each bit was stored serially in the shift registers. There is an inherent trade-off in the design of bit arrays; putting more flip-flops in a row allows a single shifter to store more bits, but requires more clock cycles to push the data through all of the shifters before the data can be read back out again.
Shift registers can have both parallel and serial inputs and outputs. These are often configured as "serial-in, parallel-out" (SIPO) or as "parallel-in, serial-out" (PISO). There are also types that have both serial and parallel input and types with serial and parallel output. There are also "bidirectional" shift registers, which allow shifting in both directions: L → R or R → L. The serial input and last output of a shift register can also be connected to create a "circular shift register". A PIPO register (parallel in, parallel out) is simply a D-type register and is not a shift register, but is very fast – an output is given within a single clock pulse. A "universal" shift register provides bidirectional serial-in and serial-out, as well as parallel-in and parallel-out.
A shiftregister is a type of digital circuit using a cascade of flip-flops where the output of one flip-flop is connected to the input of the next. They...
timers (one of which can also operate as an event counter), and an 8-bit shiftregister for serial communications or data conversion between serial and parallel...
A shiftregister lookup table, also shiftregister LUT or SRL, refers to a component in digital circuitry. It is essentially a shiftregister of variable...
Transmission using a single sub (Figure 1) involves one shiftregister in the main and one shiftregister in the sub, both of some given word size (e.g. 8 bits)...
Xorshift random number generators, also called shift-register generators, are a class of pseudorandom number generators that were invented by George Marsaglia...
register is to select one of the Future Key Registers. The Future Key Register to be selected is the one numbered identically to the bit in the Shift...
boundary effects at both ends of the register, arithmetic and logical shift operations behave the same, and a shift by 8 bit positions transports the bit...
counter is a type of counter composed of flip-flops connected into a shiftregister, with the output of the last flip-flop fed to the input of the first...
(except the zero vector) that can be represented by the shiftregisters (i.e., for length-m registers they produce a sequence of length 2m − 1). An MLS is...
that the company could use the same chips with different amounts of shift-register RAM and program ROM to produce a range of calculating machines. Hoff...
Russia. An analog feedback shiftregister (AFSR) is a generalization of the (binary, digital) linear-feedback shiftregister (LFSR). While binary LFSRs...
Division of this type is efficiently realised in hardware by a modified shiftregister, and in software by a series of equivalent algorithms, starting with...
typically generated serially from a random seed value using digital shiftregisters. The seed value serves as the cryptographic key for decrypting the...
that value bit-by-bit, in either the Shift_IR or Shift_DR stable state; TCK transitions shift the shiftregister one bit, from TDI towards TDO, exactly...
the maximum length sequence generated by a (maximal) linear feedback shiftregister (LFSR). Other examples are Gold sequences (used in CDMA and GPS), Kasami...
processing Sarcalumenin, human protein that regulates calcium transport Shiftregister lookup table, a component in digital circuitry Student Rugby League...
simplest form of the PISO has a single shiftregister that receives the parallel data once per parallel clock, and shifts it out at the higher serial clock...
Bletchley Park by early 1944. An improved Colossus Mark 2 that used shiftregisters to quintuple the processing speed, first worked on 1 June 1944, just...
the first commercial MOS integrated circuit in 1964, a 120-transistor shiftregister developed by Robert Norman. By 1964, MOS chips had reached higher transistor...
current data/value through a shiftregister. When invoked by the master, the data is clocked out from the shiftregister. The master and slave are synchronized...
special-purpose CPU with its program stored in ROM and its data stored in shiftregister read-write memory. Ted Hoff, the Intel engineer assigned to evaluate...
linear-feedback shiftregisters (LFSR), are defined in terms of the exclusive-or operation. Hence, a suitable setup of XOR gates can model a linear-feedback shift register...
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