up counter example

1 files changed, 34 insertions, 0 deletions

diff --git a/Example/counter/up_counter.vhdl b/Example/counter/up_counter.vhdl
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+++ b/Example/counter/up_counter.vhdl
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+library ieee;
+use ieee.std_logic_1164.all;
+use ieee.numeric_std.all;
+       
+entity up_counter is
+	port(Clock : in  std_logic;
+    	CLR : in  std_logic;
+        	Q : out std_logic_vector(3 downto 0));        
+end up_counter;
+       
+architecture beh of up_counter is
+	signal tmp: unsigned(3 downto 0) := "0000";
+                
+    --------------- Other ways to initialize --------------
+    -- signal tmp: unsigned(3 downto 0) := x"0";
+    -- signal tmp: unsigned(3 downto 0) := (others => '0');
+    -------------------------------------------------------
+
+    begin
+    process (Clock, CLR)        
+        begin          
+            if (CLR='1') then          
+                tmp <= "0000";          
+            elsif (Clock'event and Clock='1') then  
+                if tmp="1111" then
+                	tmp <= x"0";
+                else      
+                	tmp <= tmp +1;        
+                end if;  
+            end if;          
+    end process;
+           
+    Q <= std_logic_vector (tmp);   
+end beh;
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