HP Compaq dc7900 USDT Specifications Page 89
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Technical Reference Guide www.hp.com 7-11
Power and Signal Distribution
Figure 7-5 shows pinouts of headers used on the sytem boards.
NOTE:
No polarity consideration required for connection to speaker header P6.
NC = Not connected
Figure 7-5. System Board Header Pinouts
SW50 Clear CMOS switch
XMM1 Memory slot (black)
XMM2 Memory slot (white)
XMM3 Memory slot (white) SFF & CMT only
XMM4 Memory slot (white) SFF & CMT only
XU1 Processor socket
XB2 Battery socket
Table 7-7. (Continued)
System Board Component Designations
UART1 RX DATA 3
UART1 TX DATA 5
UART1 DTR 7
GND 9
4 UART1 RTS-
8 UART1 RI-
6 UART1 CTS-
10 Comm A Detect-
Serial Port A
Header P54
UART1 DCD- 1
2 UART1 DSR-
UART2 DTR- 1
UART2 CTS- 3
UART2 TX DATA 5
GND 7
+5.0V 9
2 UART2 RX DATA
4 UART2 DSR-
8 GND
6 UART2 RI-
10 +3.3V aux
UART2 RTS- 11
UART2 DCD- 13
12 Comm B Detect
+12V 15
14 -12V
Serial Port B
Header P52
Hood Lock 1
GND 5
2 Coil Conn
4 +12V
6 Hood Unlock
Hood Lock
Header P124
1 Hood SW Detect
2 GND
3 Hood Sensor
Hood Sense
Header P125
HD LED + 1
HD LED - 3
GND5
2 PS LED +
4 PS LED -
8 GND
Pwr Btn 7
GND 11
Therm Diode A 13
12 NC
Chassis ID0 9
14 Therm Diode C
Power Button/LED, HD LED
Header P5 (USDT, SFF)
10 Chassis ID1
HD LED Cathode 1
HD LED Anode 3
GND5
M Reset 7
+5 VDC 9
2 PS LED Cathode
4 PS LED Anode
8 GND
6 Pwr Btn
10 NC
NC 11
GND 13
12 GND
Chassis ID2 15 16 +5 VDC
Power Button/LED, HD LED
Header P5 (CMT)
18 Chassis ID1Chassis ID0 17
Mic In Right (Sleeve) 3
HP Out Right 5
Sense Send 7
HP Out Left 9
4 Front Audio Detect#
6 Sense_1 Return
10 Sense_2 Return
Front Panel Audio
Header P23
Mic In Left (Tip) 1
2 Analog GND
- Technical Reference Guide 1
- Contents 3
- 3 Processor/Memory Subsystem 4
- 4 System Support 4
- 5 Input/Output Interfaces 4
- 8SYSTEM BIOS 6
- A Error Messages and Codes 6
- 1.4 Notational Conventions 8
- Table 1-1 9
- Table 1-1 (Continued) 10
- Introduction 16
- System Overview 17
- 2.2 Features 18
- Table 2-1 19
- 2.3 System Architecture 20
- Power Supply 21
- 2.3.1 Intel Processor Support 22
- 2.3.2 Chipset 23
- 2.3.3 Support Components 24
- 2.3.4 System Memory 24
- 2.3.5 Mass Storage 25
- 2.3.6 Serial Interface 25
- 2.3.9 Graphics Subsystem 26
- 2.3.10 Audio Subsystem 26
- 2.4 Specifications 27
- Table 2-8 28
- Physical Specifications 28
- Table 2-9 29
- Optical Drive Specifications 29
- Table 2-10 30
- Hard Drive Specifications 30
- Processor/Memory Subsystem 31
- 3.2 Intel Processors 32
- 3.3 Memory Subsystem 34
- 3.3.1 Memory Upgrading 35
- System Support 37
- Software/Driver Layer 39
- Transaction Protocol Layer 39
- 4.2.3 Option ROM Mapping 40
- 4.2.4 PCI Interrupts 40
- 4.2.6 PCI Connectors 41
- PCI Express Connectors 42
- 4.3 System Resources 43
- 4.3.2 Direct Memory Access 44
- 4.4.1 Clearing CMOS 45
- 4.5 System Management 46
- Power-On / Setup Password 47
- Setup Password 47
- Cable Lock Provision 47
- I/O Interface Security 47
- Chassis Security 47
- 4.5.2 Power Management 48
- 4.5.3 System Status 49
- 4.6.1 System I/O Map 50
- Table 4-9 51
- System I/O Map 51
- 4.6.2 GPIO Functions 52
- Input/Output Interfaces 53
- 5.2 SATA/eSATA Interfaces 54
- 5.2.2 eSATA interface 55
- 5.3 Diskette Drive Interface 56
- Table 5-3 57
- 5.4 Serial Interface 58
- Table 5-5 60
- Table 5-6 62
- 5.7.1 USB Connector 63
- 5.7.2 USB Cable Data 64
- 5.8 Audio Subsystem 65
- 5.8.1 HD Audio Controller 66
- 5.8.2 HD Audio Link Bus 66
- 5.8.3 Audio Multistreaming 66
- 5.8.4 Audio Specifications 67
- 5.9.1 Wake-On-LAN Support 69
- 5.9.4 NIC Connector 70
- 5.9.5 NIC Specifications 70
- Integrated Graphics Subsystem 71
- Controller 72
- Table 6-1 73
- GMA 4500 Memory Allocation 73
- 6.3 Display Modes 74
- 6.4 Upgrading 75
- 6.5 Monitor Connectors 76
- 6.5.2 DisplayPort Connector 77
- Power and Signal Distribution 79
- Table 7-1 80
- Table 7-2 81
- Table 7-3 82
- 7.2.3 Energy Star Compliancy 83
- 7.3 Power C on tro l 84
- Table 7-5 85
- Power LED Indications 85
- Power LED Condition 85
- 7.3.2 Wake Up Events 86
- 7.3.3 Power Management 87
- 7.4 Signal Distribution 88
- Table 7-7. (Continued) 89
- SYSTEM BIOS 91
- 8.2 ROM Flashing 92
- 8.3 Boot Functions 93
- 8.3.4 Boot Error Codes 94
- Table 8-2 95
- 8.4.1 System ID and ROM Type 96
- 8.4.2 Temperature Status 96
- 8.5 SMBIOS 97
- 8.6 USB Legacy Support 98
- Error Messages and Codes 102
- Table A-2. (Continued) 102
- Error Message Probable Cause 102
- 67xx-xx) 116
- (8601-xx) 117
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