ISE报错" Warning:There is an 'U'|'X'|'W'|'Z'|'-' in an arithme

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ISE报错" Warning:There is an 'U'|'X'|'W'|'Z'|'-' in an arithmetic operand,the result will be 'X
程序如下,仿真的时候提示" Warning:There is an 'U'|'X'|'W'|'Z'|'-' in an arithmetic operand,the result will be 'X'(es).".
library IEEE;
use IEEE.STD_LOGIC_1164.ALL;
use IEEE.STD_LOGIC_ARITH.ALL;
use IEEE.STD_LOGIC_UNSIGNED.ALL;
---- Uncomment the following library declaration if instantiating
---- any Xilinx primitives in this code.
--library UNISIM;
--use UNISIM.VComponents.all;
entity kilometers is
Port ( RESET :in STD_LOGIC;
CLKOUT :in STD_LOGIC;
KM_CNT0 :out STD_LOGIC_VECTOR (3 downto 0);
KM_CNT1 :out STD_LOGIC_VECTOR (3 downto 0);
KM_CNT2 :out STD_LOGIC_VECTOR (3 downto 0);
KM_CNT3 :out STD_LOGIC_VECTOR (3 downto 0));
end kilometers;
architecture Behavioral of kilometers is
SIGNAL CNT0:STD_LOGIC_VECTOR(3 DOWNTO 0);
SIGNAL CNT1:STD_LOGIC_VECTOR(3 DOWNTO 0);
SIGNAL CNT2:STD_LOGIC_VECTOR(3 DOWNTO 0);
SIGNAL CNT3:STD_LOGIC_VECTOR(3 DOWNTO 0);
begin
PROCESS(RESET,CLKOUT)
BEGIN
IF RESET='1'
THEN CNT0

仿真时是要赋初值的问题.
例如在architecture上面,component定义下面直接写上
signal CLKOUT : STD_LOGIC：=‘0’; 这样就行

There is an A,an U and______R There is ( )"u" and ( )"l" in the word "uncle",an;an B.a;an 改错：There is an "u" in the word "us" there is -------"r" and -----"u"in the word ruler A an,an Ba 'W'is ( )lettle in the alphabet. There are minutes in an hou There is ___"o" and ____"u"in the word "house" A.a,a B.an,an 哪些单独字母前面加an,比如例题：There is an “h” and a“u” in the world "hous There is ___ "f"and __"u"in the word "four".A.an;a B,a;aC,an 翻译There is an “f” and a “u” in the world “four” There is( ) "u" in the word of umbrella.A.a B.an C.the D./ There is ____“u”in the word your.（填a或an）选择 There is ( )"a" and ( ) "u" in the word "aunt".A:a a B:an