1 files changed, 59 insertions, 0 deletions
diff --git a/sem6/dig/m4/ex1.vhdl b/sem6/dig/m4/ex1.vhdl
new file mode 100644
index 0000000..159dfff
--- /dev/null
+++ b/sem6/dig/m4/ex1.vhdl
@@ -0,0 +1,59 @@
+-- TEST_START{"inputs": ["clk"], "outputs": [],"teststep": 10, "testin": "101010101010101010101010101010"}TEST_STOP
+LIBRARY IEEE;
+USE IEEE.STD_LOGIC_1164.all;
+
+ENTITY ex1 IS
+    PORT(
+            clk: IN STD_LOGIC
+        );
+END ex1;
+
+ARCHITECTURE impl OF ex1 IS
+    SIGNAL seed : STD_LOGIC := '1';
+    SIGNAL a : STD_LOGIC := '0';
+    SIGNAL first_out : STD_LOGIC := '0';
+    SIGNAL b : STD_LOGIC := '0';
+    SIGNAL c : STD_LOGIC := '0';
+    SIGNAL d : STD_LOGIC := '0';
+    SIGNAL lp : STD_LOGIC := '0';
+
+BEGIN
+    lp <= c XOR d;
+    a <= seed OR first_out;
+
+    flip1 : ENTITY work.dflip
+    PORT MAP (
+                 d => lp,
+                 q => first_out,
+                 clk => clk
+             );
+
+    flip2 : ENTITY work.dflip
+    PORT MAP (
+                 d => a,
+                 q => b,
+                 clk => clk
+             );
+
+    flip3 : ENTITY work.dflip
+    PORT MAP (
+                 d => b,
+                 q => c,
+                 clk => clk
+             );
+
+    flip4 : ENTITY work.dflip
+    PORT MAP (
+                 d => c,
+                 q => d,
+                 clk => clk
+             );
+
+    process (clk)
+    begin
+        if (clk = '0' AND seed = '1') then
+            seed <= '0';
+        end if;
+    end process;
+
+END impl;