Power-on detection of DVI receiver IC

Details Power-on detection of DVI receiver IC Power-on detection of DVI receiver IC

2006-07-11

2006-07-11

Hsia, Sherrie (Department: 2614)

Television

Basic receiver with additional function

Multimode

C348S730000, C348S554000

Reexamination Certificate

active

07075586

ABSTRACT:
A television (TV) includes a circuit board (PCB) into which a digital video interface (DVI) receiver integrated circuit (IC) may optionally be mounted, and also includes other video sources. The TV includes a processor or controller which controls its operation, and also includes an analog switch coupled to the analog sources and to the PCB at the receiver, for switching among video sources. A scan port of the IC is coupled by way of a resistor to a general purpose I/O (GPIO) port of the switch, for indicating the presence of DVI video. The resistor has a value which places a logic low at the GPIO port when the optional receiver is present, and to allow the GPIO port to be pulled high when it is absent. A controller determines the presence or absence of the optional DVI IC by examining the logic state of the GPIO port.

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Article by Sanyo Electro co., Ltd. Semiconductor Company, LA79500E—6 input 3-output Audio/Video Switch, Tentative, dated Jan. 12, 2001, 14 pages.
Explanation of Prior Art shown in the Enclosed Figure, two page explanation.

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