Resize funktioniert nicht

my_logic_vector <= std_logic_vector(resize(unsigned'(x"434A"), my_logic_vector'length));

signal slv  :  std_logic_vector (15 downto 0);

signal uv   :  unsigned (15 downto 0);

slv <= std_logic_vector(resize(x"1234", slv'length));

--> Expression in type conversion to std_logic_vector has 2 possible definitions in this scope, for example, SIGNED and UNSIGNED.

slv <= std_logic_vector(unsigned'(resize(x"1234", slv'length)));

--> ok, das Ergebnis von resize ist ein unsigned Vektor

slv <= std_logic_vector(resize(unsigned(x"1234"), slv'length));

--> Expression in type conversion to unsigned has 7 possible definitions in this scope, for example, std_ulogic_vector and std_logic_vector.

slv <= std_logic_vector(resize(unsigned'(x"1234"), slv'length));

--> ok, die Konstante x"1234" ist ein unsigned Wert

uv <= resize(unsigned(x"1234"), uv'length);

--> Expression in type conversion to unsigned has 7 possible definitions in this scope, for example, std_ulogic_vector and std_logic_vector.

uv <= resize(unsigned'(x"434A"), uv'length);

--> ok, die Konstante x"1234" ist ein unsigned Wert

uv <= resize(x"434A", uv'length);

--> ok, der Typ von uv wird für resize verwendet

  signal int : integer := 16#80000000#;

:

:

  slv <= std_logic_vector(to_unsigned(16#87654321#, slv'length));

  The integer value of 16#80000000# is greater than integer'high.

  The integer value of 16#87654321# is greater than integer'high.