Guide

Integrated Graphics Display Port
R
Intel
®
852GM Chipset Platform Design Guide 143
• DVODETECT: Leave unconnected (NC) when using the DOVC port.
• AGPBUSY#: Connect directly to ICH4-M. A 10-k, pullup resistor is required.
• DVORCOMP is used to calibrate the DVO buffers. It should be connected to ground via a 40.2-
Ω, 1% resistor using a routing guideline of 10-mil trace and 20-mil spacing.
• DPMS: connects to 1.5 V-version of the ICH4-M’s SUSCLK or a clock that runs during S1.
• GVREF: Reference voltage for the DVOC input buffers. Refer to the figure below for proper signal
conditioning.
Figure 66. GVREF Reference Voltage
1 k
Ω
1%
+V1.5S
0.1
µ
F
GVREF(to GMCH)
1 kΩ 1%
GVREF (to DVO device)
0.1
µ
F