ENC624J600 ENC Ethernet Controller Microchip Technology ENC624J600 ENC Ethernet Controller is a low-cost stand-alone 10/100 Base-T Ethernet interface controller with integrated MAC and PHY, hardware cryptographic security engines, and a factory preprogrammed unique MAC address. A 24Kbyte on-chip RAM buffer is available for TX and RX operations. The Microchip ENC624J600 is offered with an industry standard Serial Peripheral Interface (SPI) or a flexible parallel interface. This device is designed to serve as an Ethernet network interface for any microcontroller equipped with SPI or a standard parallel port. The Microchip ENC624J600 Controller enables designers to create secured network- and Internet-connected embedded applications with minimized board space, cost, and complexity.