hod4 a

project_4/project_4.srcs/sources_1/new/counter.vhd

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+----------------------------------------------------------------------------------
+-- Company: 
+-- Engineer: 
+-- 
+-- Create Date: 09.03.2026 13:12:16
+-- Design Name: 
+-- Module Name: counter - Behavioral
+-- Project Name: 
+-- Target Devices: 
+-- Tool Versions: 
+-- Description: 
+-- 
+-- Dependencies: 
+-- 
+-- Revision:
+-- Revision 0.01 - File Created
+-- Additional Comments:
+-- 
+----------------------------------------------------------------------------------
+
+
+library IEEE;
+use IEEE.STD_LOGIC_1164.ALL;
+use IEEE.STD_LOGIC_UNSIGNED.ALL;
+
+-- Uncomment the following library declaration if using
+-- arithmetic functions with Signed or Unsigned values
+--use IEEE.NUMERIC_STD.ALL;
+
+-- Uncomment the following library declaration if instantiating
+-- any Xilinx leaf cells in this code.
+--library UNISIM;
+--use UNISIM.VComponents.all;
+
+entity counter is
+    Port ( CLK : in STD_LOGIC;
+           RST : in STD_LOGIC;
+           CE : in STD_LOGIC;
+           TC : out STD_LOGIC;
+           COUNT_OUT : out STD_LOGIC_VECTOR (3 downto 0));
+end counter;
+
+
+architecture Behavioral of counter is
+    -- Internal signal to keep track of the current number
+    signal s_cnt : STD_LOGIC_VECTOR(3 downto 0) := "0000";
+begin
+
+    -- Main counting logic
+    process(CLK)
+    begin
+        if rising_edge(CLK) then
+            if RST = '1' then
+                s_cnt <= "0000";
+            elsif CE = '1' then
+                if s_cnt = "1001" then -- If we are at 9
+                    s_cnt <= "0000";   -- Reset to 0
+                else
+                    s_cnt <= s_cnt + 1; -- Increment
+                end if;
+            end if;
+        end if;
+    end process;
+
+    -- Terminal Count logic (The red line connection)
+    -- TC is '1' ONLY when we are at 9 AND the enable pulse is active.
+    -- This ensures the next counter only moves once per rollover.
+    TC <= '1' when (s_cnt = "1001" and CE = '1') else '0';
+
+    -- Drive the output ports
+    COUNT_OUT <= s_cnt;
+
+end Behavioral;