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iPod Authentication - (IC600) MFI341S2313 is the iPod authentication ic. IC600 communicates to the J3 processor (IC100) via and I2C bus running at approximately 50KHz. When a remote Apple device is connected to the head unit via the USB, the external Apple device challenges the head unit and the head unit counterchallenges the Apple device. Once proper identification is verified, IC600 is placed in Reset mode.