Microchip’s Internet radio reference design is a good example of an application that uses serial SRAM. The radio receives signals from internet radio stations then plays back the data as audio. The heart of the design, as shown here, is Microchip’s PIC18F67J60 8-bit microcontroller. Notice that the microcontroller has an integrated 10Base-T MAC/PHY along with a SPI port and several available I/O pins.