815 Chipset Platform Owner Manual

I/O Subsystem
R
118 Intel
®
815 Chipset Platform Design Guide
10.2.5 Layout for Both Host-Side and Device-Side Cable
Detection
The Intel 815 chipset platform (using the ICH) can use two methods to detect the cable type. Each
mode requires a different motherboard layout.
It is possible to lay out for both host-side and device-side cable detection and decide the method to
be used during assembly. Figure 62 shows the layout that allows for both host-side and drive-side
detection.
For Host-Side Detection:
• R1 is a 0 Ω resistor.
• R2 is a 15 kΩ resistor.
• C1 is not stuffed.
For Device-Side Detection:
• R1 is not stuffed.
• R2 is not stuffed.
• C1 is a 0.047 µF capacitor.
Figure 62. Flexible IDE Cable Detection
ICH
C1
R1
R2
IDE_cable_det_fle
x