Patent ID: 6519708
Filing Date: 2003-02-11
Classification: G09G

Abstract:
An accelerated graphic system, comprising:a graphic chip, installed on a display card, the display providing a graphic interface reference voltage according to an input/output supply voltage; an accelerated graphics port, coupled to the display card to provide a mode signal and to delivering the graphic interface reference voltage; and a chip set comprising only one graphic interface reference voltage pin, coupled to the accelerated graphics port to control the accelerated graphic system, the chip set further comprising: a comparator, to generate a mode signal according to an input/output supply voltage and a mode determining reference voltage provided by the mother board; a multiplexer, coupled to the comparator and the graphic interface reference voltage pin, and outputting an internal reference voltage selected from either a divided voltage of the input/output supply voltage or the graphic interface reference voltage according to the mode signal; and a core circuit, coupled to the multiplexer to determine an input detecting potential level of an interface signal of the accelerated graphics port according to the internal reference voltage.