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<h1 id="clk">CLK</h1>
<p>실습키트의 50MHz의 클럭을 받아서 원하는 시간으로 LED ON OFF 과정을 수행한다.
코어모듈에 적용된 LED 와 CLK 오실레이터의 입력을 사용한다.</p>
<p><img alt="내 사진" src="../imgs/fpga_core.png" /></p>
<h2 id="pin">PIN 테이블</h2>
<table>
<thead>
<tr>
<th>핀 번호</th>
<th>신호</th>
</tr>
</thead>
<tbody>
<tr>
<td>PIN_T2</td>
<td>clk</td>
</tr>
<tr>
<td>PIN_E4</td>
<td>led</td>
</tr>
</tbody>
</table>
<h2 id="vhdl">VHDL 코드</h2>
<pre><code class="language-vhdl">
library ieee;
use ieee.std_logic_1164.all;
use ieee.numeric_std.all;
entity clk is
port (
clk : in std_logic; -- PIN T2, 50MHz
led : out std_logic -- PIN E4 (active-high 가정)
);
end entity;
architecture rtl of clk is
signal cnt : integer range 0 to 49_999_999 := 0;
signal q : std_logic := '0';
begin
process(clk)
begin
if rising_edge(clk) then
if cnt = 49_999_999 / 5 then
cnt &lt;= 0;
q &lt;= not q; -- 1초마다 토글 (ON 1초, OFF 1초)
else
cnt &lt;= cnt + 1;
end if;
end if;
end process;
led &lt;= q; -- 보드가 active-low LED라면: led0 &lt;= not q;
end architecture;
</code></pre>
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