Intel740™ Graphics Accelerator Design Guide
2-25
Addin Card Design
Video Connector (Schematic Page 14)
This page shows a specially designed solution to the problem of too many connectors and not
enough board space. This 50 pin connector allows external hookup for a tuner, S-Video in, S-Video
Out, composite video in, and composite video out. The input connections feed to the Bt829B
component while the out connections come from the Bt869. Individual designs may or may not
have all possible connectors and, therefore, may not need this type of solution.
BIOS/FAN (Schematic Page 15)
This page shows the connections to the flash BIOS and fan power. The BIOS used in this design is
a PLCC socket for early debug capabilities. To use less board space a TSOP package may be the
preferred component. Since the selected part is a 5 volt part, the data lines are isolated from the
Intel740 graphics accelerator by a level shifter.
Note: The Intel740 graphics accelerator does not require a fan for AGP compliant systems. These
design features have been added for ease of use if the customer determines a fan is required. Refer
to the Thermal Application Note and software to determine the correct thermal solution.
The fan powerdown control is done through the use of a FET. Normal operation of the fan is
allowed by the 4.7 KΩ pull-up resistor (R26). If powerdown is desired, the GPIO8 pin will turn the
FET off. Pin 3 of the fan header allows the fan to signal the Intel740 graphics accelerator that it has
failed.
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