Numbers

• Negative numbers - specified by putting a minus sign before the <size>

  • Legal: -8’d3 = 8-bit negative number stored as 2’s complement of 3
  • Illegal: 4’d-2 = ERROR!!

• Special Number Characters:

  • ‘_’ (underscore): used for readability
    • Example: 32’h21_65_bc_fe = 32-bit hexadecimal number
  • ‘x’ or ‘X’ (unknown value)
    • Example: 12’h12x = 12-bit hexadecimal number; LSBs unknown
  • ‘z’ or ‘Z’ (high impedance value)
    • Example: 1’bz = 1-bit high impedance number

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