| 摘要 |
A bi-directional serial video port coupled to a cable has a cable driver coupled to a cable connector via a D.C. blocking capacitor and a cable impedance matching resistor in series. A receiver is coupled to the cable connector via a decoupling capacitor. When configured as an input port, a control signal causes the output from the cable driver to be low so that the cable impedance matching resistor forms a termination for a cable connected to the cable connector and the receiver passes at serial digital video signal from the cable connector for further processing. Otherwise a serial digital video signal is passed by the cable driver to the cable and the output from the receiver is disregarded.
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