程序为顶层程序。如下：
library ieee;
use ieee.std_logic_1164.all;
use ieee.std_logic_unsigned.all;
entity system is
port (clk,fin,en,d,c,b,a:in std_logic;n:in std_logic_vector(7 downto 0);fout:inout std_logic);
...
One pin of the crystal oscillator has a waveform, but the other pin does not, but the voltage level is there. What's going on? The phenomenon is the same for all ten boards. Please give me some advice...
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0 Introduction
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Embedded System
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