我这还有一个小程序，下面这个小程序段只是一个分频。但是编译总报错：error:line 22:file ......timer.vhd:unsupported feature error:non-locally-static attribute names supported.---不支持的特征错误：本地的静态属性名称不支持。
请指教。
library ieee;
use ieee.std_logic_1164.all;
use ieee.std_logic_unsigned.all;
entity timer is
port(clk:in std_logic;
s100 ut std_logic);
end timer;
architecture arch of timer is
signal xishu120000:std_logic_vector(16 DOWNTO 0);
signal s100s:std_logic;
begin
fenpin:process(clk)
begin
if(clk'event and clk<='1')then
xishu120000<=xishu120000+"1";
elsif(xishu120000<="11101010011000000")then
xishu120000<="00000000000000000";
s100s<=not s100s;
end if;
s100<=s100s;
end process;
end arch;
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