Umfassender Guide zu VHDL Typkonvertierungen mit Numeric_Std & Std_Logic_Arith

Numeric_Std und Std_Logic_Arith Pakete nutzen

Unten finden Sie die häufigsten VHDL-Typkonvertierungen. Der Artikel ist in zwei Sektionen unterteilt: die erste zeigt Konvertierungen mit dem modernen numeric_std Paket, die zweite äquivalente Konvertierungen mit dem Legacy std_logic_arith Paket. Während viele Designer noch std_logic_arith nutzen, empfiehlt die Industrie Best Practice numeric_std für Klarheit und Portabilität.

Beachten Sie, dass viele Beispiele das VHDL-Attribut 'length nutzen, was Code automatisch an Vektorbreitenänderungen anpasst – eine Schlüsselstrategie für wiederverwendbare, wartbare Designs.

Beispielkonvertierungen mit Numeric_Std

• Integer zu Signed
• Integer zu Std_Logic_Vector
• Integer zu Unsigned
• Std_Logic_Vector zu Integer
• Std_Logic_Vector zu Signed
• Std_Logic_Vector zu Unsigned
• Signed zu Integer
• Signed zu Std_Logic_Vector
• Signed zu Unsigned
• Unsigned zu Integer
• Unsigned zu Signed
• Unsigned zu Std_Logic_Vector

Beispielkonvertierungen mit Std_Logic_Arith

• Integer zu Signed
• Integer zu Std_Logic_Vector
• Integer zu Unsigned
• Std_Logic_Vector zu Integer
• Std_Logic_Vector zu Signed
• Std_Logic_Vector zu Unsigned
• Signed zu Integer
• Signed zu Std_Logic_Vector
• Signed zu Unsigned
• Unsigned zu Integer
• Unsigned zu Signed
• Unsigned zu Std_Logic_Vector

Integer zu Signed mit Numeric_Std

Die to_signed Funktion benötigt zwei Argumente: den zu konvertierenden Integer und die gewünschte Vektorbreite. Das 'length Attribut hält den Code flexibel.

signal input_3 : integer; signal output_3 : signed(3 downto 0); output_3 <= to_signed(input_3, output_3'length);

Integer zu Std_Logic_Vector mit Numeric_Std

Ermitteln Sie, ob der Integer-Bereich signed oder unsigned ist. Für rein positive Werte nutzen Sie to_unsigned; für signed Werte to_signed. Beide Funktionen akzeptieren Wert und Zielbreite.

signal input_1 : integer; signal output_1a : std_logic_vector(3 downto 0); signal output_1b : std_logic_vector(3 downto 0); -- Nur positive Integers output_1a <= std_logic_vector(to_unsigned(input_1, output_1a'length)); -- Signed oder unsigned Integers output_1b <= std_logic_vector(to_signed(input_1, output_1b'length));

Integer zu Unsigned mit Numeric_Std

signal input_2 : integer; signal output_2 : unsigned(3 downto 0); output_2 <= to_unsigned(input_2, output_2'length);

Std_Logic_Vector zu Integer mit Numeric_Std

Casten Sie den Vektor zuerst zu unsigned oder signed je nach Datensemantik, dann wenden Sie to_integer an.

signal input_4 : std_logic_vector(3 downto 0); signal output_4a : integer; signal output_4b : integer; -- Unsigned Fall output_4a <= to_integer(unsigned(input_4)); -- Signed Fall output_4b <= to_integer(signed(input_4));

Std_Logic_Vector zu Signed mit Numeric_Std

signal input_6 : std_logic_vector(3 downto 0); signal output_6 : signed(3 downto 0); output_6 <= signed(input_6);

Std_Logic_Vector zu Unsigned mit Numeric_Std

signal input_5 : std_logic_vector(3 downto 0); signal output_5 : unsigned(3 downto 0); output_5 <= unsigned(input_5);

Signed zu Integer mit Numeric_Std

signal input_10 : signed(3 downto 0); signal output_10 : integer; output_10 <= to_integer(input_10);

Signed zu Std_Logic_Vector mit Numeric_Std

signal input_11 : signed(3 downto 0); signal output_11 : std_logic_vector(3 downto 0); output_11 <= std_logic_vector(input_11);

Signed zu Unsigned mit Numeric_Std

signal input_12 : signed(3 downto 0); signal output_12 : unsigned(3 downto 0); output_12 <= unsigned(input_12);

Unsigned zu Integer mit Numeric_Std

signal input_7 : unsigned(3 downto 0); signal output_7 : integer; output_7 <= to_integer(input_7);

Unsigned zu Signed mit Numeric_Std

signal input_9 : unsigned(3 downto 0); signal output_9 : signed(3 downto 0); output_9 <= signed(input_9);

Unsigned zu Std_Logic_Vector mit Numeric_Std

signal input_8 : unsigned(3 downto 0); signal output_8 : std_logic_vector(3 downto 0); output_8 <= std_logic_vector(input_8);

Integer zu Signed mit Std_Logic_Arith

signal input_3 : integer; signal output_3 : signed(3 downto 0); output_3 <= conv_signed(input_3, output_3'length);

Integer zu Std_Logic_Vector mit Std_Logic_Arith

signal input_1 : integer; signal output_1 : std_logic_vector(3 downto 0); output_1 <= conv_std_logic_vector(input_1, output_1'length);

Integer zu Unsigned mit Std_Logic_Arith

signal input_2 : integer; signal output_2 : unsigned(3 downto 0); output_2 <= conv_unsigned(input_2, output_2'length);

Std_Logic_Vector zu Integer mit Std_Logic_Arith

signal input_4 : std_logic_vector(3 downto 0); signal output_4a : integer; signal output_4b : integer; -- Unsigned Fall output_4a <= conv_integer(unsigned(input_4)); -- Signed Fall output_4b <= conv_integer(signed(input_4));

Std_Logic_Vector zu Signed mit Std_Logic_Arith

signal input_6 : std_logic_vector(3 downto 0); signal output_6 : signed(3 downto 0); output_6 <= signed(input_6);

Std_Logic_Vector zu Unsigned mit Std_Logic_Arith

signal input_5 : std_logic_vector(3 downto 0); signal output_5 : unsigned(3 downto 0); output_5 <= unsigned(input_5);

Signed zu Integer mit Std_Logic_Arith

signal input_10 : signed(3 downto 0); signal output_10 : integer; output_10 <= conv_integer(input_10);

Signed zu Std_Logic_Vector mit Std_Logic_Arith

signal input_11 : signed(3 downto 0); signal output_11 : std_logic_vector(3 downto 0); output_11 <= std_logic_vector(input_11);

Signed zu Unsigned mit Std_Logic_Arith

signal input_12 : signed(3 downto 0); signal output_12 : unsigned(3 downto 0); output_12 <= unsigned(input_12);

Unsigned zu Integer mit Std_Logic_Arith

signal input_7 : unsigned(3 downto 0); signal output_7 : integer; output_7 <= conv_integer(input_7);

Unsigned zu Signed mit Std_Logic_Arith

signal input_9 : unsigned(3 downto 0); signal output_9 : signed(3 downto 0); output_9 <= signed(input_9);

Unsigned zu Std_Logic_Vector mit Std_Logic_Arith

signal input_8 : unsigned(3 downto 0); signal output_8 : std_logic_vector(3 downto 0); output_8 <= std_logic_vector(input_8);

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