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Input/Output Interfaces
5.7.2 USB Cable Data
The recommended cable length between the host and the USB device should be no longer than
sixteen feet for full-channel (12 MB/s) operation, depending on cable specification (see
following table).
NOTE:
For sub-channel (1.5 MB/s) operation and/or when using sub-standard cable shorter lengths may be
allowable and/or necessary.
The shield, chassis ground, and power ground should be tied together at the host end but left
unconnected at the device end to avoid ground loops.
Table 5-8.
USB Cable Length Data
Conductor Size Resistance Maximum Length
20 AWG 0.036 Ω 16.4 ft (5.00 m)
22 AWG 0.057 Ω 9.94 ft (3.03 m)
24 AWG 0.091 Ω 6.82 ft (2.08 m)
26 AWG 0.145 Ω 4.30 ft (1.31 m)
28 AWG 0.232 Ω 2.66 ft (0.81 m)
Table 5-9.
USB Color Code
Signal Insulation color
Data + Green
Data - White
Vcc Red
Ground Black
- Technical Reference Guide 1
- First Edition (October 2008) 2
- Contents 3
- 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 AMD Processor Support 22
- 2.3.2 Chipset 22
- 2.3.3 Support Components 23
- 2.3.4 System Memory 23
- 2.3.5 Mass Storage 24
- 2.3.6 Serial Interface 24
- 2.3.10 Audio Subsystem 25
- 2.4 Specifications 26
- Table 2-7 27
- Physical Specifications 27
- Processor/Memory Subsystem 29
- 3.2 AMD Processors 30
- 3.3 Memory Subsystem 31
- System Support 35
- Software/Driver Layer 36
- Transaction Protocol Layer 36
- 4.2.3 Option ROM Mapping 37
- 4.2.4 PCI Interrupts 37
- 4.2.6 PCI Connectors 38
- PCI Express Connectors 39
- 4.3 System Resources 40
- 4.3.2 Direct Memory Access 41
- 4.4.1 Clearing CMOS 42
- 4.5 System Management 43
- Power-On / Setup Password 44
- Cable Lock Provision 44
- I/O Interface Security 44
- 4.5.2 Power Management 45
- 4.5.3 System Status 46
- 4.6.1 System I/O Map 47
- Table 4-8 48
- System I/O Map 48
- 4.6.2 GPIO Functions 49
- Input/Output Interfaces 51
- 5.2 SATA Interfaces 52
- 5.3 Diskette Drive Interface 54
- Table 5-2 55
- 5.4 Serial Interface 56
- Table 5-4 58
- Table 5-5 60
- 5.7.1 USB Connector 61
- 5.7.2 USB Cable Data 62
- 5.8 Audio Subsystem 63
- 5.8.1 HD Audio Controller 64
- 5.8.2 HD Audio Link Bus 64
- 5.8.3 Audio Multistreaming 64
- 5.8.4 Audio Specifications 65
- 5.9.1 Wake-On-LAN Support 67
- 5.9.4 NIC Connector 68
- 5.9.5 NIC Specifications 68
- Integrated Graphics Processor 69
- PCIe I/F 70
- 6.3 Upgrading 71
- 6.4 Monitor Connectors 72
- 6.4.2 DVI-D Connector 73
- Power and Signal Distribution 75
- 7.2.1 SFF Power Supply 76
- 7.2.2 MT Power Supply 77
- 7.3 Power C on tro l 78
- Table 7-4 79
- Power LED Indications 79
- Power LED Condition 79
- 7.3.2 Wake Up Eve nts 80
- 7.3.3 Power Management 81
- 7.4 Signal Distribution 82
- SYSTEM BIOS 85
- 8.2 ROM Flashing 86
- 8.3 Boot Functions 87
- 8.3.4 Boot Error Codes 88
- Table 8-2 89
- 8.4.1 System ID and ROM Type 90
- 8.4.2 Temperature Status 90
- 8.5 SMBIOS 91
- 8.6 USB Legacy Support 92
- 8.7 Management Functions 92
- Check for ROM update 95
- Invalid Electronic Serial 95
- Network Server Mode Active 96
- 67xx-xx) 110
- (8601-xx) 111
- Error Messages and Codes 112
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