The GPIF is a programmable 8- or 16-bit parallel interface that allows designers to reduce system costs by providing a glueless interface between the EZ-USB FX and many different types of external peripherals. The GPIF allows the EZ-USB FX to perform local bus mastering to external peripherals implementing a wide variety of protocols. For example, EIDE/ATAPI, printer parallel port (IEEE P1284), Utopia, and other interfaces can be supported using the GPIF block of the EZ-USB FX. In this example it masters the slave FIFO interface of another EZ-USB FX.