给出以下AHDL代码,解释此代码如何“debounces”按钮

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给出以下AHDL代码,解释此代码如何“debounces”按钮。
如果按下key,则input key_pressed为high;如果未按下任何key,则key_pressed为低。如果不按key,会发生什么情况?按key时会发生什么情况?
Given the following AHDL code, explain how this code “debounces” a pushbutton. If a key is pressed, input key_pressed is high; if no
key is pressed, key_pressed is low. What happens when the key isnot pressed? What happens when the key is pressed? Refer to parts of the code and be specific in your answer

问题相关代码,请勿粘贴截图

SUBDESIGN debounce
{
clk, key_pressed: INPUT;
strobe: OUTPUT;
}
VARIABLE
count[6..0]: DFF;
BEGIN
count[].clk = clk;
count[].clrn = key_pressed;
IF (count[].q <= 126) & key_pressed THEN
count[].d = count[].q+1;
IF count[].q == 126 THEN
strobe = VCC;
ELSE
strobe = GND;
END IF;
END;

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