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Disclosed is a method for an add-in card to utilize either a locally generated or a system generated voltage reference. Benefits include improved performance and improved design flexibility.
English (United States)
This text was extracted from a Microsoft Word document.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately
50% of the total text.
Method for an add-in card to utilize either a locally
generated or a system generated voltage reference
Disclosed is a method for an add-in card to utilize either a
locally generated or a system generated voltage reference. Benefits include improved performance and improved design
� � � � � Graphics and memory
controller hubs (GMCHs) can make use of a multiplexed digital video out (DVO)
interface and an accelerated graphics port (AGP) interface. This hardware
enables the systems to support either AGP or AGP digital display (ADD) cards in
the AGP connector.
� � � � � AGP connectors
provide a pathway for the motherboard to supply a reference voltage, designated
as VrefCG, to the card and a reference, designated as VrefGC, from the card
back to the motherboard. ADD cards plugged into AGP connectors must meet the
same reference supply requirements as an AGP card.
� � � � � DVO devices that
reside on ADD cards may have differing tolerances for their voltage reference
supply. Some may be tied to the motherboard’s voltage to track the noise
generated by chips (such as the GMCH) on the motherboard. Others may require a
local voltage supply for quality and reliability.
� � � � � Card/device
manufacturers must conventionally choose from the outset the referencing scheme
they want to utilize.
� � � � � The disclosed method
is circuitry on an add-in card (module) that enables vendors to select from a
locally generated voltage supply or a system-generated supply for a reference
voltage. The circuit design meets the VrefCG and VrefGC requirements of the AGP
cards. The method provides a cost-effective solution by...