numeric_std.vhdl

vhdl集成电路设计软件.需要用gcc-4.0.2版本编译.

  -- Id: A.35
  function "mod" (L: UNSIGNED; R: NATURAL) return UNSIGNED;
  -- Result subtype: UNSIGNED(L'LENGTH-1 downto 0)
  -- Result: Computes "L mod R" where L is an UNSIGNED vector and R
  --         is a non-negative INTEGER.
  --         If NO_OF_BITS(R) > L'LENGTH, result is truncated to L'LENGTH.

  -- Id: A.36
  function "mod" (L: NATURAL; R: UNSIGNED) return UNSIGNED;
  -- Result subtype: UNSIGNED(R'LENGTH-1 downto 0)
  -- Result: Computes "L mod R" where R is an UNSIGNED vector and L
  --         is a non-negative INTEGER.
  --         If NO_OF_BITS(L) > R'LENGTH, result is truncated to R'LENGTH.

  -- Id: A.37
  function "mod" (L: SIGNED; R: INTEGER) return SIGNED;
  -- Result subtype: SIGNED(L'LENGTH-1 downto 0)
  -- Result: Computes "L mod R" where L is a SIGNED vector and
  --         R is an INTEGER.
  --         If NO_OF_BITS(R) > L'LENGTH, result is truncated to L'LENGTH.

  -- Id: A.38
  function "mod" (L: INTEGER; R: SIGNED) return SIGNED;
  -- Result subtype: SIGNED(R'LENGTH-1 downto 0)
  -- Result: Computes "L mod R" where L is an INTEGER and
  --         R is a SIGNED vector.
  --         If NO_OF_BITS(L) > R'LENGTH, result is truncated to R'LENGTH.

  --============================================================================
  -- Comparison Operators
  --============================================================================

  -- Id: C.1
  function ">" (L, R: UNSIGNED) return BOOLEAN;
  -- Result subtype: BOOLEAN
  -- Result: Computes "L > R" where L and R are UNSIGNED vectors possibly
  --         of different lengths.

  -- Id: C.2
  function ">" (L, R: SIGNED) return BOOLEAN;
  -- Result subtype: BOOLEAN
  -- Result: Computes "L > R" where L and R are SIGNED vectors possibly
  --         of different lengths.

  -- Id: C.3
  function ">" (L: NATURAL; R: UNSIGNED) return BOOLEAN;
  -- Result subtype: BOOLEAN
  -- Result: Computes "L > R" where L is a non-negative INTEGER and
  --         R is an UNSIGNED vector.

  -- Id: C.4
  function ">" (L: INTEGER; R: SIGNED) return BOOLEAN;
  -- Result subtype: BOOLEAN
  -- Result: Computes "L > R" where L is a INTEGER and
  --         R is a SIGNED vector.

  -- Id: C.5
  function ">" (L: UNSIGNED; R: NATURAL) return BOOLEAN;
  -- Result subtype: BOOLEAN
  -- Result: Computes "L > R" where L is an UNSIGNED vector and
  --         R is a non-negative INTEGER.

  -- Id: C.6
  function ">" (L: SIGNED; R: INTEGER) return BOOLEAN;
  -- Result subtype: BOOLEAN
  -- Result: Computes "L > R" where L is a SIGNED vector and
  --         R is a INTEGER.

  --============================================================================

  -- Id: C.7
  function "<" (L, R: UNSIGNED) return BOOLEAN;
  -- Result subtype: BOOLEAN
  -- Result: Computes "L < R" where L and R are UNSIGNED vectors possibly
  --         of different lengths.

  -- Id: C.8
  function "<" (L, R: SIGNED) return BOOLEAN;
  -- Result subtype: BOOLEAN
  -- Result: Computes "L < R" where L and R are SIGNED vectors possibly
  --         of different lengths.

  -- Id: C.9
  function "<" (L: NATURAL; R: UNSIGNED) return BOOLEAN;
  -- Result subtype: BOOLEAN
  -- Result: Computes "L < R" where L is a non-negative INTEGER and
  --         R is an UNSIGNED vector.

  -- Id: C.10
  function "<" (L: INTEGER; R: SIGNED) return BOOLEAN;
  -- Result subtype: BOOLEAN
  -- Result: Computes "L < R" where L is an INTEGER and
  --         R is a SIGNED vector.

  -- Id: C.11
  function "<" (L: UNSIGNED; R: NATURAL) return BOOLEAN;
  -- Result subtype: BOOLEAN
  -- Result: Computes "L < R" where L is an UNSIGNED vector and
  --         R is a non-negative INTEGER.

  -- Id: C.12
  function "<" (L: SIGNED; R: INTEGER) return BOOLEAN;
  -- Result subtype: BOOLEAN
  -- Result: Computes "L < R" where L is a SIGNED vector and
  --         R is an INTEGER.

  --============================================================================

  -- Id: C.13
  function "<=" (L, R: UNSIGNED) return BOOLEAN;
  -- Result subtype: BOOLEAN
  -- Result: Computes "L <= R" where L and R are UNSIGNED vectors possibly
  --         of different lengths.

  -- Id: C.14
  function "<=" (L, R: SIGNED) return BOOLEAN;
  -- Result subtype: BOOLEAN
  -- Result: Computes "L <= R" where L and R are SIGNED vectors possibly
  --         of different lengths.

  -- Id: C.15
  function "<=" (L: NATURAL; R: UNSIGNED) return BOOLEAN;
  -- Result subtype: BOOLEAN
  -- Result: Computes "L <= R" where L is a non-negative INTEGER and
  --         R is an UNSIGNED vector.

  -- Id: C.16
  function "<=" (L: INTEGER; R: SIGNED) return BOOLEAN;
  -- Result subtype: BOOLEAN
  -- Result: Computes "L <= R" where L is an INTEGER and
  --         R is a SIGNED vector.

  -- Id: C.17
  function "<=" (L: UNSIGNED; R: NATURAL) return BOOLEAN;
  -- Result subtype: BOOLEAN
  -- Result: Computes "L <= R" where L is an UNSIGNED vector and
  --         R is a non-negative INTEGER.

  -- Id: C.18
  function "<=" (L: SIGNED; R: INTEGER) return BOOLEAN;
  -- Result subtype: BOOLEAN
  -- Result: Computes "L <= R" where L is a SIGNED vector and
  --         R is an INTEGER.

  --============================================================================

  -- Id: C.19
  function ">=" (L, R: UNSIGNED) return BOOLEAN;
  -- Result subtype: BOOLEAN
  -- Result: Computes "L >= R" where L and R are UNSIGNED vectors possibly
  --         of different lengths.

  -- Id: C.20
  function ">=" (L, R: SIGNED) return BOOLEAN;
  -- Result subtype: BOOLEAN
  -- Result: Computes "L >= R" where L and R are SIGNED vectors possibly
  --         of different lengths.

  -- Id: C.21
  function ">=" (L: NATURAL; R: UNSIGNED) return BOOLEAN;
  -- Result subtype: BOOLEAN
  -- Result: Computes "L >= R" where L is a non-negative INTEGER and
  --         R is an UNSIGNED vector.

  -- Id: C.22
  function ">=" (L: INTEGER; R: SIGNED) return BOOLEAN;
  -- Result subtype: BOOLEAN
  -- Result: Computes "L >= R" where L is an INTEGER and
  --         R is a SIGNED vector.

  -- Id: C.23
  function ">=" (L: UNSIGNED; R: NATURAL) return BOOLEAN;
  -- Result subtype: BOOLEAN
  -- Result: Computes "L >= R" where L is an UNSIGNED vector and
  --         R is a non-negative INTEGER.

  -- Id: C.24
  function ">=" (L: SIGNED; R: INTEGER) return BOOLEAN;
  -- Result subtype: BOOLEAN
  -- Result: Computes "L >= R" where L is a SIGNED vector and
  --         R is an INTEGER.

  --============================================================================

  -- Id: C.25
  function "=" (L, R: UNSIGNED) return BOOLEAN;
  -- Result subtype: BOOLEAN
  -- Result: Computes "L = R" where L and R are UNSIGNED vectors possibly
  --         of different lengths.

  -- Id: C.26
  function "=" (L, R: SIGNED) return BOOLEAN;
  -- Result subtype: BOOLEAN
  -- Result: Computes "L = R" where L and R are SIGNED vectors possibly
  --         of different lengths.

  -- Id: C.27
  function "=" (L: NATURAL; R: UNSIGNED) return BOOLEAN;
  -- Result subtype: BOOLEAN
  -- Result: Computes "L = R" where L is a non-negative INTEGER and
  --         R is an UNSIGNED vector.

  -- Id: C.28
  function "=" (L: INTEGER; R: SIGNED) return BOOLEAN;
  -- Result subtype: BOOLEAN
  -- Result: Computes "L = R" where L is an INTEGER and
  --         R is a SIGNED vector.

  -- Id: C.29
  function "=" (L: UNSIGNED; R: NATURAL) return BOOLEAN;
  -- Result subtype: BOOLEAN
  -- Result: Computes "L = R" where L is an UNSIGNED vector and
  --         R is a non-negative INTEGER.

  -- Id: C.30
  function "=" (L: SIGNED; R: INTEGER) return BOOLEAN;
  -- Result subtype: BOOLEAN
  -- Result: Computes "L = R" where L is a SIGNED vector and
  --         R is an INTEGER.

  --============================================================================

  -- Id: C.31
  function "/=" (L, R: UNSIGNED) return BOOLEAN;
  -- Result subtype: BOOLEAN
  -- Result: Computes "L /= R" where L and R are UNSIGNED vectors possibly
  --         of different lengths.

  -- Id: C.32
  function "/=" (L, R: SIGNED) return BOOLEAN;
  -- Result subtype: BOOLEAN
  -- Result: Computes "L /= R" where L and R are SIGNED vectors possibly
  --         of different lengths.

  -- Id: C.33
  function "/=" (L: NATURAL; R: UNSIGNED) return BOOLEAN;
  -- Result subtype: BOOLEAN
  -- Result: Computes "L /= R" where L is a non-negative INTEGER and
  --         R is an UNSIGNED vector.

  -- Id: C.34
  function "/=" (L: INTEGER; R: SIGNED) return BOOLEAN;
  -- Result subtype: BOOLEAN
  -- Result: Computes "L /= R" where L is an INTEGER and
  --         R is a SIGNED vector.

  -- Id: C.35
  function "/=" (L: UNSIGNED; R: NATURAL) return BOOLEAN;
  -- Result subtype: BOOLEAN
  -- Result: Computes "L /= R" where L is an UNSIGNED vector and
  --         R is a non-negative INTEGER.

  -- Id: C.36
  function "/=" (L: SIGNED; R: INTEGER) return BOOLEAN;
  -- Result subtype: BOOLEAN
  -- Result: Computes "L /= R" where L is a SIGNED vector and
  --         R is an INTEGER.

  --============================================================================
  -- Shift and Rotate Functions
  --============================================================================

  -- Id: S.1
  function SHIFT_LEFT (ARG: UNSIGNED; COUNT: NATURAL) return UNSIGNED;
  -- Result subtype: UNSIGNED(ARG'LENGTH-1 downto 0)
  -- Result: Performs a shift-left on an UNSIGNED vector COUNT times.
  --         The vacated positions are filled with '0'.
  --         The COUNT leftmost elements are lost.

  -- Id: S.2
  function SHIFT_RIGHT (ARG: UNSIGNED; COUNT: NATURAL) return UNSIGNED;
  -- Result subtype: UNSIGNED(ARG'LENGTH-1 downto 0)
  -- Result: Performs a shift-right on an UNSIGNED vector COUNT times.
  --         The vacated positions are filled with '0'.
  --         The COUNT rightmost elements are lost.

  -- Id: S.3
  function SHIFT_LEFT (ARG: SIGNED; COUNT: NATURAL) return SIGNED;
  -- Result subtype: SIGNED(ARG'LENGTH-1 downto 0)
  -- Result: Performs a shift-left on a SIGNED vector COUNT times.
  --         The vacated positions are filled with '0'.
  --         The COUNT leftmost elements are lost.

  -- Id: S.4
  function SHIFT_RIGHT (ARG: SIGNED; COUNT: NATURAL) return SIGNED;