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Eight-bit addition overflow

EasyRTL DesignSystemVerilog

Two unsigned 8-bit values are added and assigned to an 8-bit result register. The inputs are 8'hFF and 8'h01. What value is stored in the 8-bit result?

Choose one

Answer choices

  1. A. 8'h00; the carry is truncated unless the design explicitly keeps a ninth bit.
  2. B. 8'h01, because the larger operand is discarded on overflow.
  3. C. 9'h100, because every addition automatically widens the destination.
  4. D. 8'hFF, because unsigned arithmetic saturates by default.
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