📄 求助：8路抢答器的vhdl实现（有问题，希望大家帮忙解决，谢谢）--综合电子论坛.mht
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Date: Fri, 4 Jan 2008 12:17:43 +0800
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name=3Ddbg rows=3D10>library ieee;
use ieee.std_logic_1164.all;
use ieee.std_logic_arith.all;
use ieee.std_logic_unsigned.all;
entity status is=20
port( clk:in std_logic;
reset:in std_logic;
settime:in std_logic;
start:in std_logic;
test:in std_logic;
work:out std_logic;
load_8:out std_logic;
load_clk:out std_logic);
end status;
architecture sta of status is
type status_type is (sta_reset,sta_settime,sta_test,sta_work);
signal nex_status,curr_status:status_type;
begin
process(clk,reset)
begin
if reset=3D=A3=A71=A3=A7 then
curr_status<=3Dsta_reset;
elsif clk=A3=A7event and clk=3D=A3=A71=A3=A7 then
curr_status<=3Dnex_status;
end if;
end process;
process(curr_status,settime,start,test)
begin
case curr_status is
when sta_test =3D> =
load_8<=3D=A3=A71=A3=A7;nex_status<=3Dsta_reset;
when sta_settime =3D> =
load_clk<=3D=A3=A71=A3=A7;nex_status<=3Dsta_reset;
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