VHDL wait for语句library IEEE;use ieee.std_logic_1164.all;use ieee.std_logic_unsigned.all;entity fpga_topp is port ( SPI_CS: OUT std_logic); end fpga_topp;architecture RTL of fpga_topp isBEGINPROCESS BEGIN loop1:loop SPI_CS
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VHDL wait for语句
library IEEE;
use ieee.std_logic_1164.all;
use ieee.std_logic_unsigned.all;
entity fpga_topp is
port ( SPI_CS: OUT std_logic);
end fpga_topp;
architecture RTL of fpga_topp is
BEGIN
PROCESS
BEGIN
loop1:loop
SPI_CS
你在用软件的思路设计硬件,是不会有结果的.
因为软件是顺序执行的,硬件是并行工作的.
你的设计实体要有输入信号,你想让输出信号SPI_CS每个周期(200ns)输出170ns低电平,30ns高电平,那就设计一个输入时钟信号clk,周期为10ns,设计计数器为0~19,每个clk周期加1,当计数器值为0~2时SPI_CS输出高电平,3~19时输出低电平就可以了.
你的进程需要敏感信号clk,在每个clk的有效边沿(例如上升沿)让计数器加1.
不需要LOOP语句,LOOP语句不是你想的那样执行循环体.一定记住你在描述硬件而不是执行软件指令.
VHDL wait for语句library IEEE;use ieee.std_logic_1164.all;use ieee.std_logic_unsigned.all;entity fpga_topp is port ( SPI_CS: OUT std_logic); end fpga_topp;architecture RTL of fpga_topp isBEGINPROCESS BEGIN loop1:loop SPI_CS
Libra
Libra
wait for
wait for
wait for
wait for
Wait for
wait for
VHDL的IF语句是 IF THEN ELSIF
vhdl 并行语句进程语句,case语句,元件例化语句,when.else语句,哪个不是并行语句
wait for your for?
Libra是什么意思
Libra YUANRUI.
Wait for me Wait for you是什么意思
wait for do还是wait for doing
Wait for it!Wait for it!
piease wait for please wait for