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DVI and HDMI use different physical layer (electrical) levels than DisplayPort. Therefore, level shifters are needed to translate the AC-coupled, low-swing differential signals from the ‘source’ chipset I/O to the DC-coupled, TMDS-encoded signals accepted by DVI and HDMI display (sink) devices. Additionally these level shifters translate the DDC channel (low-speed bus communication to identify and configure different monitor types) and HPD (hardware plug detect) signals to levels usable by the chipset.
PTM Published on: 2011-11-02
Mexico