Debouncing button in fpga

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Last updated 9:07 AM on 3/6/25
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15 Terms

1
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What is button bouncing?
The rapid opening and closing of a mechanical button's contacts, causing multiple false signals.
2
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Why is button debouncing necessary in FPGA designs?
To ensure a single, clean signal is registered when a button is pressed or released.
3
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What is a common duration for button bounce?
Typically between 1ms to 20ms, depending on the button's mechanical properties.
4
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What is the simplest debouncing method?
Adding a delay (e.g., 20ms) after detecting a button press to ignore bounce signals.
5
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What is a debounce counter?
A counter used to wait for a stable signal by counting clock cycles during the bounce period.
6
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How does a state machine help in button debouncing?
It transitions between states (e.g., idle, waiting, stable) to detect a stable button press.
7
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What is the role of a flip-flop in debouncing?
To store the stable state of the button after the bounce period has passed.
8
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What is the difference between active-high and active-low buttons?
Active-high buttons output a high signal when pressed, while active-low buttons output a low signal.
9
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What is a common clock frequency used for debouncing in FPGAs?
Typically 50MHz or 100MHz, depending on the FPGA's clocking resources.
10
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What is the purpose of a shift register in debouncing?
To sample the button signal over multiple clock cycles and detect a stable state.
11
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What is the advantage of using a hardware debouncer over software?
Hardware debouncers are faster and do not consume CPU resources.
12
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What is the disadvantage of using a delay-based debouncer?
It can introduce latency and may not handle rapid button presses well.
13
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What is the role of edge detection in debouncing?
To detect the rising or falling edge of a button press, ignoring intermediate bounce signals.
14
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What is a common debouncing circuit in FPGAs?
A combination of a counter, shift register, and state machine to filter out bounce signals.
15
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What is the importance of testing debouncing circuits?
To ensure reliable operation under different conditions and button types.