What is the difference between synchronous and asynchronous resets in FPGA design?

Understanding the Difference between Synchronous and Asynchronous Resets in FPGA Design

In FPGA design, the difference between synchronous and asynchronous resets plays a crucial role in ensuring the reliability and functionality of the system. The focus keyword for this interview question is FPGA design resets.

Synchronous Resets

Synchronous resets are characterized by being synchronized with the system clock signal. This means that the reset signal is only activated or deactivated at specific clock cycles, ensuring proper timing and avoiding potential hazards such as metastability.

Asynchronous Resets

On the other hand, asynchronous resets are not bound to the system clock and can be activated or deactivated at any time. While this provides flexibility in the reset operation, asynchronous resets can introduce timing issues and requires careful consideration to prevent glitches and ensure proper functionality.

In summary, the key difference between synchronous and asynchronous resets in FPGA design lies in their timing and synchronization with the system clock signal. Understanding and implementing the appropriate reset methodology is essential for achieving reliable and efficient FPGA designs.