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VHDL入門 > CLK生成

Last updated at Posted at 2016-05-26

参考: VHDLによるFPGA設計 & デバッグ by 松村謙 & 坂巻 佳壽美

実装

  • 10nsごとにH,Lを切替えるCLKの生成
  • 100nsで停止する

code

上記の本の情報を元に、自分なりに考えてみた。

design.vhd
library IEEE;
use IEEE.std_logic_1164.all;

entity CLOCK is
port ( CLK: in std_logic);
end CLOCK;

architecture RTL of CLOCK is
begin
end;
testbench.vhd
library IEEE;
use IEEE.std_logic_1164.all;

entity testbench is
end testbench;

architecture SIM of testbench is
	signal I_CLK : std_logic := '1';
component CLOCK
	port ( CLK: in std_logic);
end component;

begin
    process begin
    	I_CLK <= '1';
       	wait for 10 ns;
        I_CLK <= '0';
       	wait for 10 ns;
   	end process;
    
    process begin
    	wait for 100 ns;
        -- to end the testbench
        assert false
        report "end." severity FAILURE;
  	end process;
    
    U1: CLOCK port map(CLK => I_CLK);
end SIM;

testbenchの1つめのprocess beginでCLKを生成しつつ、2つめのprocess beginでシミュレーションを停止する時間を100nsとしている。

結果

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