Metastability and Solution in Asynchronous Reset Designs

Although an asynchronous reset is a safe way to reliably reset circuitry, removal of an asynchronous reset can cause metastability if not done properly. A proper way to design with asynchronous resets by adding the reset synchronizer logic and using reset distribute buffer tree to allow asynchronous reset of the design and to insure synchronous reset removal to permit safe restoration of normal design functionality was given in this paper.