新手提问，实现电子秒表的存读取功能

用FPGA做一个秒表 能实现存读取数据的功能，要求保存三组数据
这是我的存储器的模块，硬件运行时无法实现以上功能，请问哪里出错了？非常感谢

library IEEE;
use IEEE.STD_LOGIC_1164.ALL;
use IEEE.STD_LOGIC_arith.ALL;
use IEEE.STD_LOGIC_UNSIGNED.ALL;
entity latch is
Port ( savein : in STD_LOGIC;
readin : in STD_LOGIC;
overin : in STD_LOGIC;
number_in1 : in STD_LOGIC_VECTOR (3 downto 0);
number_in2 : in STD_LOGIC_VECTOR (3 downto 0);
number_in3 : in STD_LOGIC_VECTOR (3 downto 0);
number_in4 : in STD_LOGIC_VECTOR (3 downto 0);
number_in5 : in STD_LOGIC_VECTOR (3 downto 0);
number_in6 : in STD_LOGIC_VECTOR (3 downto 0);
overout : out STD_LOGIC;
number_out1 : out STD_LOGIC_VECTOR (3 downto 0);
number_out2 : out STD_LOGIC_VECTOR (3 downto 0);
number_out3 : out STD_LOGIC_VECTOR (3 downto 0);
number_out4 : out STD_LOGIC_VECTOR (3 downto 0);
number_out5 : out STD_LOGIC_VECTOR (3 downto 0);
number_out6 : out STD_LOGIC_VECTOR (3 downto 0));
end latch;
architecture Behavioral of latch is
signal cnt : STD_LOGIC_VECTOR (2 downto 0);
signal num : STD_LOGIC_VECTOR (2 downto 0);
signal number01,number02,number03,number04,number05,number06 : STD_LOGIC_VECTOR (3 downto 0);
signal number11,number12,number13,number14,number15,number16 : STD_LOGIC_VECTOR (3 downto 0);
signal number21,number22,number23,number24,number25,number26 : STD_LOGIC_VECTOR (3 downto 0);
begin

process(savein)
begin
if rising_edge(savein) then
if cnt<"010" then
cnt<=cnt+1;
else
cnt<="000";
end if;
end if;
end process;
process(readin)
begin
if rising_edge(readin) then
if num<"010" then
num<=num+1;
else
num<="000";
end if;
end if;
end process;

process(cnt,num)
begin
case cnt is
when "000" =>number01<=number_in1;
number02<=number_in2;
number03<=number_in3;
number04<=number_in4;
number05<=number_in5;
number06<=number_in6;
when "001" =>number11<=number_in1;
number12<=number_in2;
number13<=number_in3;
number14<=number_in4;
number15<=number_in5;
number16<=number_in6;
when "010" =>number21<=number_in1;
number22<=number_in2;
number23<=number_in3;
number24<=number_in4;
number25<=number_in5;
number26<=number_in6;
when others=>number_out1<=number_in1;
number_out2<=number_in2;
number_out3<=number_in3;
number_out4<=number_in4;
number_out5<=number_in5;
number_out6<=number_in6;
end case;

case num is
when "000" =>number_out1<=number01;
number_out2<=number02;
number_out3<=number03;
number_out4<=number04;
number_out5<=number05;
number_out6<=number06;
when "001" =>number_out1<=number11;
number_out2<=number12;
number_out3<=number13;
number_out4<=number14;
number_out5<=number15;
number_out6<=number16;
when "010" =>number_out1<=number21;
number_out2<=number22;
number_out3<=number23;
number_out4<=number24;
number_out5<=number25;
number_out6<=number26;
when others =>number_out1<=number_in1;
number_out2<=number_in2;
number_out3<=number_in3;
number_out4<=number_in4;
number_out5<=number_in5;
number_out6<=number_in6;
end case;
end process;
end Behavioral;