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Technical Reference

2.2.2.6 Front Panel USB 2.0 Headers

Figure 12 is a connection diagram for the front panel USB 2.0 headers.

NOTE

• The +5 V DC power on the USB headers is fused.

• Use only a front panel USB connector that conforms to the USB 2.0 specification

for high-speed USB devices.

Figure 12. Connection Diagram for Front Panel USB 2.0 Headers

2.2.2.7 Low Pin Count (LPC) Debug header

During the POST, the BIOS generates diagnostic progress codes (POST codes) to I/O

port 80h. If the POST fails, execution stops and the last POST code generated is left

at port 80h. This code is useful for determining the point where an error occurred.

Displaying the POST codes requires a POST card that can interface with the Low Pin

Count (LPC) Debug header. The POST card can decode the port and display the

contents on a medium such as a seven-segment display.

Table 31. LPC Debug Header

Pin Signal Name Pin Signal Name

1 CK_33M_DEBUG 2 GND

3 PLTRST# 4 LFRAME#

5 LAD0 6 LAD1

7 LAD2 8 LAD3

9 GND 10 GND

11 +3.3 V 12 +3.3 V

13 Not Connected 14 +3.3 V

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