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docs/simulink/4.VHDL코드.md

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+
+# VHDL 코드 
+
+HDL Coder 을 이용하여 VHDL 코드를 생성한다.
+
+## 생성된 코드
+
+
+```
+
+library ieee;
+use ieee.std_logic_1164.all;
+use ieee.numeric_std.all;
+
+entity led_blink is
+    port(
+        clk  : in  std_logic;
+        rst  : in  std_logic;
+
+        key0 : in  std_logic;
+        key1 : in  std_logic;
+        key2 : in  std_logic;
+        key3 : in  std_logic;
+
+        led  : out std_logic
+    );
+end entity;
+
+architecture rtl of led_blink is
+
+    signal mode      : unsigned(1 downto 0) := "00";
+    signal cnt       : unsigned(31 downto 0) := (others=>'0');
+    signal period    : unsigned(31 downto 0);
+    signal led_state : std_logic := '0';
+
+begin
+
+    ------------------------------------------------------------------
+    -- period 결정
+    ------------------------------------------------------------------
+    process(mode)
+    begin
+
+        case mode is
+
+            when "00" =>
+                period <= to_unsigned(0,32);
+
+            when "01" =>
+                period <= to_unsigned(50000000,32);
+
+            when "10" =>
+                period <= to_unsigned(25000000,32);
+
+            when others =>
+                period <= to_unsigned(5000000,32);
+
+        end case;
+
+    end process;
+
+    ------------------------------------------------------------------
+    -- 메인 상태기계
+    ------------------------------------------------------------------
+    process(clk,rst)
+    begin
+
+        if rst='1' then
+
+            mode      <= "00";
+            cnt       <= (others=>'0');
+            led_state <= '0';
+
+        elsif rising_edge(clk) then
+
+            ----------------------------------------------------------
+            -- mode 저장
+            ----------------------------------------------------------
+            if key0='1' then
+                mode <= "00";
+
+            elsif key1='1' then
+                mode <= "01";
+
+            elsif key2='1' then
+                mode <= "10";
+
+            elsif key3='1' then
+                mode <= "11";
+            end if;
+
+            ----------------------------------------------------------
+            -- LED 생성
+            ----------------------------------------------------------
+            if mode = "00" then
+
+                cnt       <= (others=>'0');
+                led_state <= '0';
+
+            else
+
+                if cnt >= period then
+
+                    cnt <= (others=>'0');
+
+                    led_state <= not led_state;
+
+                else
+
+                    cnt <= cnt + 1;
+
+                end if;
+
+            end if;
+
+        end if;
+
+    end process;
+
+    led <= led_state;
+
+end architecture;
+
+```
+
+## 핀배치
+
+
+| 핀 번호 | 신호 |
+|---------|------|
+| PIN_T2 | clk |
+| PIN_E4 | rst |
+| PIN_A3 | key0 |
+| PIN_A5 | key1 |
+| PIN_A6 | key2 |
+| PIN_A20 | key3 |
+| PIN_B3 | led |
+
+
+
+## 테스트 진행
+
+해당 코드를 Quartus 를 이용하여 컴파일 하고, 동작 과정을 실습한다.
+
+