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In computer architecture, bit-serial architectures send data one bit at a time, along a single wire, in contrast to bit-parallel word architectures, in which data values are sent all bits or a word at once along a group of wires.

All digital computers built before 1951, and most of the early massive parallel processing machines used a bit-serial architecture—they were serial computers.

Bit-serial architectures were developed for digital signal processing in the 1960s through 1980s, including efficient structures for bit-serial multiplication and accumulation.^[1]

The HP Nut processor used in many Hewlett-Packard calculators operated bit-serially.^[2]

Assuming N is an arbitrary integer number, N serial processors will often take less FPGA area and have a higher total performance than a single N-bit parallel processor.^[3]

• Serial computer
• 1-bit computing
• Bit banging
• Bit slicing
• BKM algorithm
• CORDIC

• Application of FPGA technology to accelerate the finite-difference time-domain (FDTD) method
• BIT-Serial FIR filters with CSD Coefficients for FPGAs

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