重庆大学EDA课程设计-vhdl语言-12.24小时时钟-乐曲播放电路-函数信号发生器.docx

附录一、12/24小时数字时钟VHDL设计1，系统顶层逻辑图：时序仿真波形管脚定义以及锁定2，分频模块。①各个分频模块的模块图：②，分别对应的仿真波形：③50mhz分频至1k模块代码：library ieee;use ieee.std_logic_unsigned.all;use ieee.std_logic_1164.all;entity wh4574_divto1k is port(clk50m:in std_logic; clk1k:out std_logic);end wh4574_divto1k;architecture behav of wh4574_divto1k is signal count1:std_logic_vector(14 downto 0); signal count2:std_logic; signal co:std_logic; begin process(clk50m) begin if clk50mevent and clk50m=1 then if count1=110000110100111 then count1=000000000000000; co=1; else count1=count1+1; co=0; end if; end if; end process; process(co) begin if coevent and co=1 then count2=not count2; end if; end process; clk1k=count2;end behav;50mhz分频至2k模块代码：library ieee;use ieee.std_logic_unsigned.all;use ieee.std_logic_1164.all;entity wh4574_divto2k is port(clk50m:in std_logic; clk2k:out std_logic);end wh4574_divto2k;architecture behav of wh4574_divto2k is signal count1:std_logic_vector(13 downto 0); signal count2:std_logic; signal co:std_logic; begin process(clk50m) begin if clk50mevent and clk50m=1 then if count1=11000011010011 then count1=00000000000000; co=1; else count1=count1+1; co=0; end if; end if; end process; process(co) begin if coevent and co=1 then count2=not count2; end if; end process; clk2k=count2;end behav;1k分频至5hz代码：library ieee;use ieee.std_logic_unsigned.all;use ieee.std_logic_1164.all;entity wh4574_div1kto5 is port(inclk1k:in std_logic; clk5hz:out std_logic);end wh4574_div1kto5;architecture behav of wh4574_div1kto5 is signal count1:std_logic_vector(6 downto 0); signal count2:std_logic; signal co:std_logic; begin process(inclk1k) begin if inclk1kevent and inclk1k=1 then if count1=1100011 then count1=0000000; co=1; else count1=count1+1; co=0; end if; end if; end process; process(co) begin if coevent