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shirleydp@sohu. 该用户已被删除
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| 我在MAXPLUS2中用Vhdl 编写的SRAM程序无法通过，错误提示：15行：unsupported feature error:non locally static bounds are not supported
程序如下：
LIBRARY ieee;
USE ieee.std_logic_1164.ALL;
use ieee.std_logic_unsigned.all;
ENTITY sram64 IS
GENERIC(k: integer := 8;
w: integer:= 3);
PORT(
wr, rd,cs: IN STD_LOGIC;
addr: IN STD_LOGIC_VECTOR(w-1 downto 0);
din: IN STD_LOGIC_VECTOR(w-1 downto 0);
dout : OUT STD_LOGIC_vector(k-1 downto 0));
END sram64 ;
ARCHITECTURE a OF sram64 IS
subtype word is std_logic_vector(k-1 downto 0);
type memory is array (0 to 2**w-1) of word;
SIGNAL addr_in: integer range 0 to 2**w-1;
SIGNAL din_change,wr_rise: time:=0 ps;
signal sram:memory;
BEGIN
addr_in<=conv_integer(addr);
process(wr)
begin
if(wr'event and wr='1') then
if(cs='1' and wr='1') then
sram(addr_in)<=din after 2 ns;
end if;
end if;
wr_rise<=now;
assert(now-din_change>=800 ps);
report "setup error din(sram)"
severity warning;
end process;
process(din)
begin
din_change<=now;
assert (now-wr_rise>=800 ps);
report"hold error din(sram)"
severity warning;
end process;
END a; |
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