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Disclosed is a method for level shifting on a digital display card for multiple devices and multiple voltages. Benefits include improved design flexibility and improved throughput.
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
54% of the total text.
Method for level shifting on a digital display card for
multiple devices and multiple voltages
Disclosed is a method for level shifting on a digital display
card for multiple devices and multiple voltages. Benefits
include improved design flexibility and improved throughput.
� � � � � � Conventional digital display cards utilize a
dedicated digital voltage output (DVO) channel and dedicated I2C
pins that enable direct connection to digital video-out devices. These cards
are subject to a constraint in that all signals must be a maximum of 1.5V on
the advanced graphics processor (AGP) slot. As a result, level shifting enables
I2C lines to be connected to the devices on the ADD card without
damaging the graphics and memory controller hub (GMCH, see Figure 1). With
a single DVO channel, a maximum of three devices can use the I2C
bus. With two DVO channels, the potential exists to have five or more devices
that require I2C connection. However, only three I2C
pairs can be multiplexed with the AGP slot so a sharing mechanism is required.
� � � � � The GMCH is a device
that supports both the memory controller and graphics controller. With the
graphics controller, several different options for displays are available.
Displays can come from the internal graphics device, through the AGP slot on
the motherboard or through the dedicated DVO port. The AGP slot is versatile
and provides various options. The AGP slot provides graphics data and functions