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library ieee;
use ieee.std_logic_1164.all;
use ieee.numeric_std.all;
entity submodule is
port (
clk : in std_logic;
arg : in std_logic_vector(15 downto 0);
res : out std_logic_vector(15 downto 0)
);
end submodule;
library ieee;
use ieee.std_logic_1164.all;
use ieee.numeric_std.all;
entity sliced_ex is
port (
clk : in std_logic;
arg_a : in signed(7 downto 0);
arg_b : in signed(7 downto 0);
res_a : out signed(7 downto 0);
res_b : out signed(7 downto 0)
);
end sliced_ex;
architecture rtl of sliced_ex is
signal tmp : signed(15 downto 0);
begin
SUB_MODULE : entity work.submodule
port map (
clk => clk,
arg( 7 downto 0) => std_logic_vector(arg_a),
arg(15 downto 8) => std_logic_vector(arg_b),
-- The casting of a sliced output causes an exception.
-- Casting of the entire output bus does work
-- signed(res) => tmp -- (this would work)
signed(res( 7 downto 0)) => res_a,
signed(res(15 downto 8)) => res_b
);
end rtl;
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