Intel DQ67EP Product Specification - Page 53

Front Panel USB Headers, 2.2.7, Low Pin Count LPC Debug Connector

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Technical Reference 2.2.2.6 Front Panel USB Headers Figure 12 is a connection diagram for the front panel USB 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 Headers 2.2.2.7 Low Pin Count (LPC) Debug Connector 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 connector. The POST card can decode the port and display the contents on a medium such as a seven-segment display. Table 24. LPC Debug Connector Pin Signal Name Pin 1 VCC3 2 3 PLTRST_N 4 5 LAD0/FWH0 6 7 LAD2/FWH2 8 9 LFRAME_N/FWH4 10 11 GND Signal Name VCC3 LPC_CLK LAD1/FWH1 LAD3/FWH3 GND 53

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Technical Reference
53
2.2.2.6
Front Panel USB Headers
Figure 12 is a connection diagram for the front panel USB 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 Headers
2.2.2.7
Low Pin Count (LPC) Debug Connector
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 connector.
The POST card can decode the port and display the
contents on a medium such as a seven-segment display.
Table 24.
LPC Debug Connector
Pin
Signal Name
Pin
Signal Name
1
VCC3
2
VCC3
3
PLTRST_N
4
LPC_CLK
5
LAD0/FWH0
6
LAD1/FWH1
7
LAD2/FWH2
8
LAD3/FWH3
9
LFRAME_N/FWH4
10
GND
11
GND