Abstract: A packaged circuit including a digital controller, a port physical layer and a digital coding circuit is provided. The digital controller outputs digital data in parallel via a parallel data channel, and the digital data includes a plurality of data bits. The port physical layer includes a clock generator, and outputs a data signal according to the data bits. The clock generator outputs a clock signal to the digital controller. The digital coding circuit is coupled to the digital controller and the port physical layer, and receives the digital data and the clock signal. The digital coding circuit codes the clock signal to generate a plurality of clock bits, and outputs the clock bits to the port physical layer. The port physical layer converts the clock bits into an output clock and outputs the output clock.

Abstract: An integrated circuit structure including a reference circuit and at least two core circuits is provided. The reference circuit provides a reference current. The at least two core circuits are coupled to the reference circuit for receiving the reference current. Each of the core circuits includes a current-calibration circuit. The current-calibration circuit generates a bias current according to the reference current in the core circuit. The core circuits use the bias current to replace the reference circuit. In an IC test process, the reference circuit provides the reference current through the pin of the integrated circuit electronically connected to the external impedance. After the IC test process, the connection of the reference circuit and the pin of the integrated circuit is disconnected.

Abstract: A packaged circuit including a digital controller, a port physical layer and a digital coding circuit is provided. The digital controller outputs digital data in parallel via a parallel data channel, and the digital data includes a plurality of data bits. The port physical layer includes a clock generator, and outputs a data signal according to the data bits. The clock generator outputs a clock signal to the digital controller. The digital coding circuit is coupled to the digital controller and the port physical layer, and receives the digital data and the clock signal. The digital coding circuit codes the clock signal to generate a plurality of clock bits, and outputs the clock bits to the port physical layer. The port physical layer converts the clock bits into an output clock and outputs the output clock.