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library ieee;
use ieee.std_logic_1164.all;
entity delay is
port (
clk : in std_logic;
reset: in std_logic;
start: in std_logic;
done: out std_logic
);
end entity delay;
architecture fast of delay is -- The reader is unenlightened as to fast/slow
begin
end architecture fast;
architecture slow of delay is
begin
end architecture slow;
library ieee;
use ieee.std_logic_1164.all;
entity dut is
generic (
SPEED : string := "fast"
);
port(
clk : in std_logic;
reset: in std_logic;
start: in std_logic;
done: out std_logic);
end entity dut;
architecture dutarch of dut is
-- component delay is -- component declaration not needed or used here.
-- port (
-- clk : in std_logic;
-- reset: in std_logic;
-- start: in std_logic;
-- done: out std_logic
-- );
-- end component delay;
begin
d1g:
if SPEED = "fast" generate
d1: -- The alternative labels, if any, within an if generate statement or a
-- case generate statement shall all be distinct. 11.8 Generate statements
entity work.delay(fast)
port map (
clk => clk,
reset => reset,
start => start,
done => done
);
else generate
d1: -- This isn't a distinct label in the else alternative
entity work.delay(slow)
port map (
clk => clk,
reset => reset,
start => start,
done => done
);
end generate;
end architecture dutarch;
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