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*第22701篇: 求助!本人学习时遇到一个问题,请各位大侠指教!
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求助!本人学习时遇到一个问题,请各位大侠指教!library ieee;
use ieee.std_logic_1164.all;
use ieee.std_logic_arith.all;
entity sync is
port(clk:in std_logic;
irq:out std_logic);
end sync;
architecture dataflow of sync is
signal temp:std_logic_vector(3 downto 0);
begin
label1:process
variable cou1:std_logic_vector(3 downto 0):="0000";
begin
wait until clk='1';
cou1:=cou1+1;--- 请教各位大侠这条语句始终不能通过编译，为什么啊！
temp <=cou1;
end process;
label2:process
begin
wait until clk='1';
if(temp="1111")then
irq <='0';
else
irq <='1';
end if;
end process;
end dataflow;