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Hardware interview practice

Isolate the lowest set bit

EasyBit ManipulationSystemVerilog

Return a mask containing only the least-significant 1 bit of x.

Reviewed example

Work through one case

Input
value = 8'b1011_0000
Expected output
8'b0001_0000

value & -value isolates bit 4, the least-significant set bit.

What to cover

Requirements

  1. Return zero when x is zero.
  2. Use two's-complement arithmetic.