Question: library ieee; use ieee.std _ logic _ 1 1 6 4 . all; entity gcd _ controller _ gcdrm is port ( clk : in

library ieee;
use ieee.std_logic_1164.all;
entity gcd_controller_gcdrm is
port (
clk : in std_logic; -- System clock
rst : in std_logic; -- Reset signal
start : in std_logic; -- Start signal
done : out std_logic -- Done signal
);
end gcd_controller_gcdrm;
architecture Behavioral of gcd_controller_gcdrm is
-- State encoding
type state_type is (IDLE, CALC_ROW_GCDS, CALC_COL_GCDS, REPLACE_MATRIX, DONE);
signal state : state_type := IDLE; -- Current state
signal next_state : state_type := IDLE; -- Next state
signal done_flag : std_logic :='0'; -- Internal done signal
begin
-- Map the internal done signal to the output port
done <= done_flag;
-- State Transition Process
process(clk, rst)
begin
if rst ='1' then
state <= IDLE; -- Reset state
elsif rising_edge(clk) then
state <= next_state; -- Transition to next state
end if;
end process;
-- Next State Logic Process
process(state, start)
begin
-- Default assignments
next_state <= state; -- Default to maintaining current state
done_flag <='0'; -- Default value for done signal
-- State Machine Logic
case state is
when IDLE =>
if start ='1' then
next_state <= CALC_ROW_GCDS;
end if;
when CALC_ROW_GCDS =>
next_state <= CALC_COL_GCDS;
when CALC_COL_GCDS =>
next_state <= REPLACE_MATRIX;
when REPLACE_MATRIX =>
next_state <= DONE;
when DONE =>
done_flag <='1'; -- Assert done in the DONE state
next_state <= IDLE;
when others =>
next_state <= IDLE; -- Safety fallback
end case;
end process;
end Behavioral;
The errors are:
Line 15: 'done' is already declared in this region Line 54: cannot read from 'out' object 'done. use 'inout' or 'buffer' instead. type error near 'done' expected type 'state_type' Linne 56: same as line 54 along with case choice must be a locally static expression

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