使用VHDL和Xilinx的带按钮开关的计数器设计 [英] Counter with push button switch design using VHDL and Xilinx
问题描述
我是VHDL和XILINX ISE的新手.我使用的Xilinx ISE版本是13.2.
I'm very new to VHDL and XILINX ISE. I use the version 13.2 for Xilinx ISE.
我想用以下输入设计一个非常简单的计数器:
I want to design a very simple counter with the following inputs:
- 方向
- 算
计数输入将分配给一个按钮，并且我希望计数器在按下按钮时根据方向输入向上或向下计数.在此之前，我已经编写了一个示例VHDL.它有一个时钟输入，并且正在根据时钟输入进行计数.现在，我希望它在按下按钮时进行计数，而不是同步进行计数.
The count input will be assigned to a button and I want the counter to count up or down according to direction input when the button is pressed. I have written a sample VHDL before this one. It had a clock input and It was counting according to the clock input. Now I want it to count when I press the button instead of counting synchronously.
这是我的VHDL代码(请告诉我我的代码是否存在逻辑缺陷或任何其他缺陷):
Here's my VHDL code (please tell me if my code have a logical or any other flaw):
entity counter is
Port ( COUNT_EN : in STD_LOGIC;
DIRECTION : in STD_LOGIC;
COUNT_OUT : out STD_LOGIC_VECTOR (3 downto 0));
end counter;
architecture Behavioral of counter is
signal count_int : std_logic_vector(3 downto 0) := "0000";
begin
process
begin
if COUNT_EN='1' then
if DIRECTION='1' then
count_int <= count_int + 1;
else
count_int <= count_int - 1;
end if;
end if;
end process;
COUNT_OUT <= count_int;
end Behavioral;
我使用Spartan xc3s500e，并相应地放置了输入.以下是我的.ucf文件:
I use Spartan xc3s500e and I placed the inputs accordingly. Below is my .ucf file:
#Created by Constraints Editor (xc3s500e-fg320-5) - 2013/03/18
NET "COUNT_EN" LOC = K17;
NET "COUNT_OUT[0]" LOC = F12;
NET "COUNT_OUT[1]" LOC = E12;
NET "COUNT_OUT[2]" LOC = E11;
NET "COUNT_OUT[3]" LOC = F11;
NET "DIRECTION" LOC = L13;
#Created by Constraints Editor (xc3s500e-fg320-5) - 2013/03/18
NET "COUNT_EN" CLOCK_DEDICATED_ROUTE = FALSE;
由于出现错误，我需要更改最后一行:
I needed to change the last line because I was getting the error:
This will not allow the use of the fast path between the IO and the Clock...
此错误消失后，我对设备进行了编程.但是输出(LED)表现得很疯狂.他们有时静止不动几秒钟，有时只是快闪.我不知道我的错误在哪里.我将不胜感激，非常感谢一些初学者的教程(我发现的链接将我定向到xilinx的文档，对于初学者来说，它们似乎很复杂).
After having this error gone, I programmed the device. But the output (leds) acted crazy. They sometimes stood still for a few seconds, sometimes just flashed very fast. I could not figure out where my mistake is. I would appreciate any help, some beginner tutorials are greatly appreciated (the links i found directed me to xilinx's documentations and they seemed quite complicated for a beginner).
推荐答案
From your description I understand that you are not looking for an Asynchronous Counter.
您需要的是依靠按钮开关触发的计数器.下面的RTL应该可以工作:
What you need is counter that counts on trigger from PushButton Switch. The below RTL should work:
如果HDL编码有任何困难，请告诉我.
If any difficulty in HDL coding let me know.
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