如何解决多路复用器不模拟变化
我对 FPGA 还很陌生,目前我正在尝试实现 MUX。
目前我的代码看起来像这样
entity mux4x1 is
Port ( S : in std_logic_vector(1 downto 0);
E : in std_logic_vector(3 downto 0);
Y : out std_logic);
end mux4x1;
architecture Behavioral of mux4x1 is
signal outputBuff: std_logic;
begin
Y <= outputBuff;
with S select
outputBuff <= E(0) when "00",E(1) when "01",E(2) when "10",E(3) when "11",'0' when others;
end Behavioral;
不幸的是,每次我尝试模拟代码并更改输入“S”的值时,E 的值都没有改变!
Vivado Commands
General Messages
[USF-XSim-62] 'elaborate' step Failed with error(s). Please check the Tcl console output or 'C:/Users/John Bryan Valle/Documents/Vivado/Programme/Artix-7/MUX4X1/MUX4X1.sim/sim_1/behav/xsim/elaborate.log' file for more information.
[Vivado 12-4473] Detected error while running simulation. Please correct the issue and retry this operation.
Synthesis
[Designutils 20-970] Unrecognized or unsupported command 'set_property IOSTANDARD LVCMOS33 [get_ports {E[2]}}]' found in constraint file. ["C:/Users/John Bryan Valle/Documents/Vivado/Programme/Artix-7/Lab-1/Lab 1 Full Adder/BASYS 3/Full_Adder_2.xdc":55]
Implementation
Design Initialization
[Designutils 20-970] Unrecognized or unsupported command 'set_property IOSTANDARD LVCMOS33 [get_ports {E[2]}}]' found in constraint file. ["C:/Users/John Bryan Valle/Documents/Vivado/Programme/Artix-7/Lab-1/Lab 1 Full Adder/BASYS 3/Full_Adder_2.xdc":55]
Place Design
DRC
Pin Planning
IO Standard
[DRC BIVC-1] Bank IO standard Vcc: Conflicting Vcc voltages in bank 14. For example,the following two ports in this bank have conflicting VCCOs:
E[2] (LVCMOS18,requiring VCCO=1.800) and E[0] (LVCMOS33,requiring VCCO=3.300)
[Vivado_Tcl 4-23] Error(s) found during DRC. Placer not run.
先谢谢你! :)
解决方法
E 是一个输入,因此您不会期望它在模拟中自行改变 - 相反,E 和 S 的变化会影响 Y。
,当您的数据类型不是 bit
类型时,您应该使用它的库。您使用了 std_logic_vector
数据类型。所以你需要调用它的实现库。该库名为 std_logic_1164
。
另外,不需要定义中间缓冲区,但它的存在不是问题
library IEEE;
use IEEE.std_logic_1164.all
entity mux4x1 is
Port ( S : in std_logic_vector(1 downto 0);
E : in std_logic_vector(3 downto 0);
Y : out std_logic);
end mux4x1;
architecture Behavioral of mux4x1 is
begin
with S select
Y <= E(0) when "00",E(1) when "01",E(2) when "10",E(3) when "11",'0' when others;
end Behavioral;
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