Versal ACAP DSP Engine Architecture Manual (AM004)

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1.2.1 English

The IEEE term for denormal is subnormal. The following explains how DSP58 behaves when it detects a subnormal input and when it creates a subnormal output.

  • When the DSP58 detects a subnormal operand, it treats the operand as zero with the sign of the original operand.
  • When the DSP58 creates a subnormal output, it flushes the output to zero and the sign is preserved as a result of the mantissa of the adder. For the multiplier, the sign is the XOR of the signs of both inputs.