Examples Restructered

11 files changed, 357 insertions, 0 deletions

diff --git a/Example/combinational_logic/bin_to_gray/bin_to_gray.vhdl b/Example/combinational_logic/bin_to_gray/bin_to_gray.vhdl
new file mode 100644
index 0000000..d6045e8
--- /dev/null
+++ b/Example/combinational_logic/bin_to_gray/bin_to_gray.vhdl
@@ -0,0 +1,21 @@
+LIBRARY ieee;
+USE ieee.std_logic_1164.ALL;
+
+entity bin_to_gray is
+port(   
+		bin : in std_logic_vector(3 downto 0); 
+        G   : out std_logic_vector(3 downto 0)
+    );
+end bin_to_gray;
+
+
+architecture gate_level of bin_to_gray is 
+
+begin
+
+G(3) <= bin(3);
+G(2) <= bin(3) xor bin(2);
+G(1) <= bin(2) xor bin(1);
+G(0) <= bin(1) xor bin(0);
+
+end gate_level;
\ No newline at end of file
diff --git a/Example/combinational_logic/counter/counter.vhdl b/Example/combinational_logic/counter/counter.vhdl
new file mode 100644
index 0000000..ba14df8
--- /dev/null
+++ b/Example/combinational_logic/counter/counter.vhdl
@@ -0,0 +1,30 @@
+library ieee;
+
+use ieee.std_logic_1164.all;
+use ieee.numeric_std.all;
+
+entity counter is
+port(C : in std_logic;
+     CLR : in std_logic;
+     Q : out std_logic_vector(3 downto 0));
+end counter;
+
+architecture bhv of counter is
+
+	signal tmp: std_logic_vector(3 downto 0);
+	begin
+	process (C, CLR)
+
+		begin
+			if (CLR='1') then
+			tmp <= "0000";
+
+			elsif (C'event and C='1') then
+			tmp <= std_logic_vector(to_unsigned(1+to_integer(unsigned(tmp)), tmp'length));
+
+			end if;
+
+	end process;
+	Q <= tmp;
+
+end bhv;
\ No newline at end of file
diff --git a/Example/combinational_logic/counter/updown_counter.vhdl b/Example/combinational_logic/counter/updown_counter.vhdl
new file mode 100644
index 0000000..922ee67
--- /dev/null
+++ b/Example/combinational_logic/counter/updown_counter.vhdl
@@ -0,0 +1,32 @@
+library IEEE;
+use IEEE.STD_LOGIC_1164.ALL;
+use IEEE.numeric_std.ALL;
+
+
+entity updown_counter is
+    Port ( clk: in std_logic;
+           reset: in std_logic;
+     up_down: in std_logic;
+           counter: out std_logic_vector(3 downto 0)
+     );
+end updown_counter;
+
+architecture Behavioral of updown_counter is
+signal tmp: std_logic_vector(3 downto 0);
+begin
+
+process(clk,reset)
+begin
+    if(reset='1') then
+         tmp <= "0000";
+    elsif(clk'event and clk='1') then
+         if(up_down='1') then
+           tmp <= std_logic_vector(to_unsigned(to_integer(unsigned(tmp)-1), tmp'length));
+         else 
+           tmp <= std_logic_vector(to_unsigned(to_integer(unsigned(tmp)+1), tmp'length));
+         end if;
+    end if;
+end process;
+ counter <= std_logic_vector(tmp);
+
+end Behavioral;
\ No newline at end of file
diff --git a/Example/combinational_logic/decoder/decoder.vhdl b/Example/combinational_logic/decoder/decoder.vhdl
new file mode 100644
index 0000000..e429ec9
--- /dev/null
+++ b/Example/combinational_logic/decoder/decoder.vhdl
@@ -0,0 +1,50 @@
+library ieee;
+use ieee.std_logic_1164.all;
+
+entity decoder is 
+port (
+		p : in std_logic_vector(4 downto 0);
+      	d : out std_logic_vector(31 downto 0)
+     );
+end decoder;
+
+architecture behav of decoder is
+
+begin
+
+with p select
+d<="00000000000000000000000000000001" when "00000",
+"00000000000000000000000000000010" when "00001",
+"00000000000000000000000000000100" when "00010",
+"00000000000000000000000000001000" when "00011",
+"00000000000000000000000000010000" when "00100",
+"00000000000000000000000000100000" when "00101",
+"00000000000000000000000001000000" when "00110",
+"00000000000000000000000010000000" when "00111",
+"00000000000000000000000100000000" when "01000",
+"00000000000000000000001000000000" when "01001",
+"00000000000000000000010000000000" when "01010",
+"00000000000000000000100000000000" when "01011",
+"00000000000000000001000000000000" when "01100",
+"00000000000000000010000000000000" when "01101",
+"00000000000000000100000000000000" when "01110",
+"00000000000000001000000000000000" when "01111",
+"00000000000000010000000000000000" when "10000",
+"00000000000000100000000000000000" when "10001",
+"00000000000001000000000000000000" when "10010",
+"00000000000010000000000000000000" when "10011",
+"00000000000100000000000000000000" when "10100",
+"00000000001000000000000000000000" when "10101",
+"00000000010000000000000000000000" when "10110",
+"00000000100000000000000000000000" when "10111",
+"00000001000000000000000000000000" when "11000",
+"00000010000000000000000000000000" when "11001",
+"00000100000000000000000000000000" when "11010",
+"00001000000000000000000000000000" when "11011",
+"00010000000000000000000000000000" when "11100",
+"00100000000000000000000000000000" when "11101",
+"01000000000000000000000000000000" when "11110",
+"10000000000000000000000000000000" when "11111",
+"00000000000000000000000000000000" when others;
+
+end behav;
diff --git a/Example/combinational_logic/full_adder/full_adder_sl.vhdl b/Example/combinational_logic/full_adder/full_adder_sl.vhdl
new file mode 100644
index 0000000..e830563
--- /dev/null
+++ b/Example/combinational_logic/full_adder/full_adder_sl.vhdl
@@ -0,0 +1,19 @@
+library ieee;
+use ieee.std_logic_1164.all;
+use ieee.numeric_std.all;
+ 
+entity full_adder_sl is
+  port (
+    i_bit1  : in std_logic;
+    i_bit2  : in std_logic;
+    i_bit3  : in std_logic;
+    o_sum   : out std_logic;
+    o_carry : out std_logic
+    );
+end full_adder_sl;
+ 
+architecture rtl of full_adder_sl is
+begin
+  o_sum   <= i_bit1 xor i_bit2 xor i_bit3;
+  o_carry <= (i_bit1 and i_bit2) or (i_bit2 and i_bit3) or (i_bit3 and i_bit1);
+end rtl;
\ No newline at end of file
diff --git a/Example/combinational_logic/full_adder/full_adder_sl_slv.vhdl b/Example/combinational_logic/full_adder/full_adder_sl_slv.vhdl
new file mode 100644
index 0000000..7de9c1b
--- /dev/null
+++ b/Example/combinational_logic/full_adder/full_adder_sl_slv.vhdl
@@ -0,0 +1,19 @@
+library ieee;
+use ieee.std_logic_1164.all;
+use ieee.numeric_std.all;
+ 
+entity full_adder_sl_slv is
+  port (
+    i_bit1  : in std_logic;
+    i_bit2  : in std_logic;
+    i_bit3  : in std_logic_vector(0 downto 0);
+    o_sum   : out std_logic;
+    o_carry : out std_logic_vector(0 downto 0)
+    );
+end full_adder_sl_slv;
+ 
+architecture rtl of full_adder_sl_slv is
+begin
+  o_sum   <= i_bit1 xor i_bit2 xor i_bit3(0);
+  o_carry(0) <= (i_bit1 and i_bit2) or (i_bit2 and i_bit3(0)) or (i_bit3(0) and i_bit1);
+end rtl;
\ No newline at end of file
diff --git a/Example/combinational_logic/full_adder/full_adder_slv.vhdl b/Example/combinational_logic/full_adder/full_adder_slv.vhdl
new file mode 100644
index 0000000..a0495f0
--- /dev/null
+++ b/Example/combinational_logic/full_adder/full_adder_slv.vhdl
@@ -0,0 +1,19 @@
+library ieee;
+use ieee.std_logic_1164.all;
+use ieee.numeric_std.all;
+ 
+entity full_adder_slv is
+  port (
+    i_bit1  : in std_logic_vector(0 downto 0);
+    i_bit2  : in std_logic_vector(0 downto 0);
+    i_bit3  : in std_logic_vector(0 downto 0);
+    o_sum   : out std_logic_vector(0 downto 0);
+    o_carry : out std_logic_vector(0 downto 0)
+    );
+end full_adder_slv;
+ 
+architecture rtl of full_adder_slv is
+begin
+  o_sum   <= i_bit1 xor i_bit2 xor i_bit3;
+  o_carry <= (i_bit1 and i_bit2) or (i_bit2 and i_bit3) or (i_bit3 and i_bit1);
+end rtl;
diff --git a/Example/combinational_logic/full_adder/full_adder_structural.vhdl b/Example/combinational_logic/full_adder/full_adder_structural.vhdl
new file mode 100644
index 0000000..eb06a3d
--- /dev/null
+++ b/Example/combinational_logic/full_adder/full_adder_structural.vhdl
@@ -0,0 +1,87 @@
+library ieee;
+use ieee.std_logic_1164.all;
+
+entity full_adder_structural is
+port(a: in std_logic;
+	 b: in std_logic;
+     cin: in std_logic;
+     sum: out std_logic;
+     carry: out std_logic);
+end full_adder_structural;
+
+library ieee;
+use ieee.std_logic_1164.all;
+
+entity andgate is
+port(a: in std_logic;
+     b: in std_logic;
+     z: out std_logic);
+end andgate;
+
+architecture e1 of andgate is
+begin
+z <= a and b;
+end e1;
+
+library ieee;
+use ieee.std_logic_1164.all;
+
+entity xorgate is
+port(a: in std_logic;
+     b: in std_logic;
+     z: out std_logic);
+end xorgate;
+
+architecture e2 of xorgate is
+begin
+z <= a xor b;
+end e2;
+
+library ieee;
+use ieee.std_logic_1164.all;
+
+entity orgate is
+port(a: in std_logic;
+     b: in std_logic;
+     z: out std_logic);
+end orgate;
+
+architecture e3 of orgate is
+begin
+z <= a or b;
+end e3;
+
+
+
+architecture structural of full_adder_structural is
+
+component andgate
+port(a: in std_logic;
+     b: in std_logic;
+     z: out std_logic);
+end component;
+
+component xorgate
+port(a: in std_logic;
+	 b: in std_logic;
+     z: out std_logic);
+end component;
+
+component orgate
+port(a: in std_logic;
+	 b: in std_logic;
+     z: out std_logic);
+end component;
+
+signal c1,c2,c3: std_logic;
+
+begin
+
+u1 : xorgate port map(a,b,c1);
+u2 : xorgate port map(c1,cin,sum);
+u3 : andgate port map(c1,cin,c2);
+u4 : andgate port map(a,b,c3);
+u5 : orgate port map(c2,c3,carry);
+
+
+end structural;
\ No newline at end of file
diff --git a/Example/combinational_logic/half_adder/half_adder.vhdl b/Example/combinational_logic/half_adder/half_adder.vhdl
new file mode 100644
index 0000000..71ef1cc
--- /dev/null
+++ b/Example/combinational_logic/half_adder/half_adder.vhdl
@@ -0,0 +1,18 @@
+library ieee;
+use ieee.std_logic_1164.all;
+use ieee.numeric_std.all;
+ 
+entity half_adder is
+  port (
+    i_bit0  : in std_logic_vector(0 downto 0);
+    i_bit1  : in std_logic_vector(0 downto 0);
+    o_sum   : out std_logic_vector(0 downto 0);
+    o_carry : out std_logic_vector(0 downto 0)
+    );
+end half_adder;
+ 
+architecture rtl of half_adder is
+begin
+  o_sum   <= i_bit0 xor i_bit1;
+  o_carry <= i_bit0 and i_bit1;
+end rtl;
diff --git a/Example/combinational_logic/mux-demux/demux.vhdl b/Example/combinational_logic/mux-demux/demux.vhdl
new file mode 100644
index 0000000..e73c196
--- /dev/null
+++ b/Example/combinational_logic/mux-demux/demux.vhdl
@@ -0,0 +1,32 @@
+library IEEE;
+use IEEE.STD_LOGIC_1164.all;
+
+entity demux is
+ port(
+
+ F : in STD_LOGIC_vector(0 downto 0);
+ S0: in STD_LOGIC_vector(0 downto 0);
+ S1: in STD_LOGIC_vector(0 downto 0);
+ A: out STD_LOGIC_vector(0 downto 0);
+ B: out STD_LOGIC_vector(0 downto 0);
+ C: out STD_LOGIC_vector(0 downto 0);
+ D: out STD_LOGIC_vector(0 downto 0)
+ );
+end demux;
+
+architecture bhv of demux is
+begin
+process (F,S0,S1) is
+begin
+ if (S0 ="0" and S1 = "0") then
+ A <= F;
+ elsif (S0 ="1" and S1 = "0") then
+ B <= F;
+ elsif (S0 ="0" and S1 = "1") then
+ C <= F;
+ else
+ D <= F;
+ end if;
+
+end process;
+end bhv;
diff --git a/Example/combinational_logic/mux-demux/mux.vhdl b/Example/combinational_logic/mux-demux/mux.vhdl
new file mode 100644
index 0000000..b72e287
--- /dev/null
+++ b/Example/combinational_logic/mux-demux/mux.vhdl
@@ -0,0 +1,30 @@
+library IEEE;
+use IEEE.STD_LOGIC_1164.all;
+ 
+entity mux is
+ port(A : in std_logic;
+      B : in std_logic;
+      C : in std_logic;
+      D : in std_logic;
+      S0 : in std_logic;
+      S1 : in std_logic;
+      Z: out std_logic);
+end mux;
+ 
+architecture bhv of mux is
+begin
+process (A,B,C,D,S0,S1) is
+begin
+  if (S0 ='0' and S1 = '0') then
+      Z <= A;
+  elsif (S0 ='0' and S1 = '1') then
+      Z <= B;
+  elsif (S0 ='1' and S1 = '0') then
+      Z <= C;
+  else
+      Z <= D;
+  end if;
+ 
+end process;
+end bhv;
+