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UPSD325X 数据表(PDF) 87 Page - STMicroelectronics |
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UPSD325X 数据表(HTML) 87 Page - STMicroelectronics |
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87 / 176 page  87/176 µPSD325X DEVICES Host Type Detection The detection procedure conforms to the se- quences proposed by VESA Monitor Display Data Channel (DDC) specification. The monitor needs to determine the type of host system: s DDC1 or OLD type host. s DDC2B host (Host is master, monitor is always slave) s DDC2B+/DDC2AB(ACCESS.bus) host. Figure 41. Host Type Detection AI06644 Is VSYNC present? Has a command been received? Is 2B+/A.B command detected? Is DDC2B+/DDC2AB? Is it DDC2B command? Power on Communication isidle EDID sent continously using VSYNC as clock Is DDC2 clock present? Stop sending of EDID switch to DDC2 communication mode DDC2 communication is idle. Respond to DDC2B command Respond to DDC2B+/ DDC2AB command |
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