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+# 7SEG
+
+실습키트의 7SEGMENT의 출력이 정상적으로 되는지 확인한다.
+
+![내 사진](imgs/seg.png)
+
+
+
+## PIN 테이블
+
+
+| 핀 번호 | 신호 |
+|---------|------|
+| PIN_AA13 | led_out[0] |
+| PIN_AA14 | led_out[1] |
+| PIN_AA15 | led_out[2] |
+| PIN_AA16 | led_out[3] |
+| PIN_AA17 | led_out[4] |
+| PIN_AA18 | led_out[5] |
+| PIN_AA19 | led_out[6] |
+| PIN_AA20 | led_out[7] |
+| PIN_AB14 | seg[6] |
+| PIN_AB15 | seg[5] |
+| PIN_AB16 | seg[4] |
+| PIN_AB17 | seg[3] |
+| PIN_AB18 | seg[2] |
+| PIN_AB19 | seg[1] |
+| PIN_AB20 | seg[0] |
+
+
+
+## VHDL 코드
+
+```vhdl
+
+library ieee;
+use ieee.std_logic_1164.all;
+
+entity seg_out is
+   port(
+      seg     : out std_logic_vector(6 downto 0);   -- 7-세그 출력 (g~a)
+      led_out : out std_logic_vector(0 to 7)        -- 기존 인덱스(0 to 7)
+   );
+end seg_out;
+
+architecture SegmentDecoder of seg_out is
+    signal key : integer range 0 to 15 := 5;  -- 표시할 숫자 (0~15)
+begin
+    ----------------------------------------------------------------
+    -- with-select: key 값 → seg 패턴 매핑 (VHDL-93 호환)
+    ----------------------------------------------------------------
+    with key select
+        seg <=
+            "100" & "0000" when 0,   -- 0
+            "111" & "1001" when 1,   -- 1
+            "010" & "0100" when 2,   -- 2
+            "011" & "0000" when 3,   -- 3
+            "001" & "1001" when 4,   -- 4
+            "001" & "0010" when 5,   -- 5
+            "000" & "0010" when 6,   -- 6
+            "111" & "1000" when 7,   -- 7
+            "000" & "0000" when 8,   -- 8
+            "001" & "0000" when 9,   -- 9
+            "000" & "1000" when 10,  -- A
+            "000" & "0011" when 11,  -- b
+            "100" & "0110" when 12,  -- C
+            "010" & "0001" when 13,  -- d
+            "000" & "0110" when 14,  -- E
+            "000" & "1110" when 15,  -- F
+            "111" & "1111" when others;  -- blank
+
+    ----------------------------------------------------------------
+    -- LED 개별 비트 설정: 기존 코드 그대로 유지
+    ----------------------------------------------------------------
+    led_out(7) <= '1';  -- LED 7번 ON
+    led_out(6) <= '1';
+    led_out(5) <= '1';
+    led_out(4) <= '0';  -- LED 4번 ON
+    led_out(3) <= '0';
+    led_out(2) <= '0';
+    led_out(1) <= '1';
+    led_out(0) <= '1';  -- LED 0번 ON
+
+end architecture;
+
+```
+
+---
+
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