?? speed.vhd
字號:
library ieee;
use ieee.std_logic_1164.all;
use ieee.std_logic_unsigned.all;
ENTITY speed IS
PORT(
clk,reset,start:IN STD_LOGIC;
k:IN STD_LOGIC_VECTOR(4 downto 0);
clkout:OUT STD_LOGIC);
END speed;
ARCHITECTURE a OF speed IS
SIGNAL count1:STD_LOGIC_VECTOR(1 downto 0);
SIGNAL tempclk,clks:STD_LOGIC;
SIGNAL kinside:STD_LOGIC_VECTOR(4 downto 0);
BEGIN
kinside<="00000"-k;
clks_label:
PROCESS(reset,clk)
variable count2:STD_LOGIC_VECTOR(4 downto 0);
BEGIN
IF reset='1' THEN
count2:="00000";
ELSIF clk'event and clk='1' THEN
if start='1'then
if count2=kinside then
count2:="00000";
end if;
if not (k="00000") then
count2:=count2+1;
end if;
if count2="00001" then
tempclk<=not tempclk;
end if;
end if;
END IF;
END PROCESS clks_label;
clkout<=tempclk;
END a;
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