This application note explains the internal operation of the large FIFOs manufactured by Cypress and shows how to use the devices to accomplish depth and width expansion. Other topics covered here include FIFO interfacing, the writing and reading process, failure modes, and typical problem symptomsand solutions. This information applies to the following Cypress FIFOs: CY7C419, CY7C420, CY7C421, CY7C424, CY7C425, CY7C428, CY7C429, CY7C432, CY7C433,CY7C439, CY7C460, CY7C462, CY7C464, CY7C470,CY7C472, and CY7C474.Timing parameters given in this application note are taken from Cypress Semiconductor’s High Performance Data Book.