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[求助]用VHDL语言分配引脚

[求助]用VHDL语言分配引脚

library IEEE; use IEEE.std_logic_1164.all; use ieee.std_logic_arith.all; use ieee.std_logic_unsigned.all; entity mpc860 is port ( sysclk: in STD_LOGIC; clkout: out STD_LOGIC; cs5: in STD_LOGIC; cs6: in STD_LOGIC; cs7: in STD_LOGIC; st: out STD_LOGIC; rw: in STD_LOGIC; ddir: out STD_LOGIC; rst: in STD_LOGIC; dena: out STD_LOGIC; speed: in STD_LOGIC; pb30: in STD_LOGIC; pb31: buffer STD_LOGIC; hreset : buffer STD_LOGIC; d: out STD_LOGIC_VECTOR (15 downto 0) ); attribute LOC : string; attribute LOC of ddir : signal is "P7"; attribute LOC of hreset : signal is "P13"; attribute LOC of clkout : signal is "P38"; attribute LOC of sysclk : signal is "P6";--------ok attribute LOC of cs5 : signal is "P26";--------ok attribute LOC of cs6 : signal is "P24";--------ok attribute LOC of st: signal is "P29";--------ok attribute LOC of cs7 : signal is "P25";--------ok attribute LOC of rw : signal is "P39";--------ok attribute LOC of rst : signal is "P33";--------ok attribute LOC of dena : signal is "P5";--------ok attribute LOC of speed : signal is "P22";--------ok attribute LOC of pb30 : signal is "P27";--------ok attribute LOC of pb31 : signal is "P28";--------ok attribute LOC of d : signal is "P8,P9,P11,P12,P14,P18,P20,P19,P40,P42,P43,P44,P1,P2,P3,P4"; end mpc860; architecture mpc860_arch of mpc860 is signal num:std_logic_vector(12 downto 0); signal clk,dir:std_logic; begin clkout<=sysclk; ddir<=rw; hreset<=not rst; dena<=cs5 and cs6 and cs7; process(hreset) begin case hreset is when '0'=>d(15 downto 0)<="0000011001100000"; when '1'=>d<="ZZZZZZZZZZZZZZZZ"; when others=>null; end case; end process; process(speed,pb30) begin if(pb30='1')then pb31<='1'; elsif(speed'event and speed='1')then pb31<='0'; end if; end process; process(sysclk) begin if(sysclk'event and sysclk='1')then num<=num+1; end if; end process; st<=((not pb31)or num(11))and cs5; end mpc860_arch; 在xilinx 的foundation 下 有程序如上 用attribute LOC 分配编译后注有-----OK的是分配正确的 其他都错了,急切想知道原因 望各位同仁提出宝贵建议。[em18]

[此贴子已经被作者于2004-3-9 15:50:39编辑过]

管教分配要根据具体器件来分的
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