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Input/Output Interfaces
5.9.1 HD Audio Controller
The HD Audio Controller is a PCI Express device that is integrated into the 82801 ICH
component and supports the following functions:
■ Read/write access to audio codec registers
■ Support for greater than 48-KHz sampling
■ HD audio interface
5.9.2 HD Audio Link Bus
The HD audio controller and the HD audio codec communicate over a five-signal HD Audio
Link Bus (Figure 5-10). The HD Audio Interface includes two serial data lines; serial data out
(SDO, from the controller) and serial data in (SDI, from the audio codec) that transfer control
and PCM audio data serially to and from the audio codec using a time-division multiplexed
(TDM) protocol. The data lines are qualified by the 24-MHz BCLK signal driven by the audio
controller. Data is transferred in frames synchronized by the 48-KHz SYNC signal, which is
derived from the clock signal and driven by the audio controller. When asserted (typically during
a power cycle), the RESET- signal (not shown) will reset all audio registers to their default
values.
Figure 5-10. HD Audio Link Bus Protocol
5.9.3 Audio Multistreaming
The audio subsystem can be configured (through the ADI control panel) for processing audio for
multiple applications. The Headphone Out jack can provide audio for one application while the
Line Out jack can provide external speaker audio from another application.
BCLK
SYNC
SDO
SDI
RST#
Command Stream
Response Stream
Tag C
Stream C
Tag A
Tag B
Frame
Start
Start
Frame
Frame
Stream A
Stream B
NOTE: Clock not drawn to scale.
- Technical Reference Guide 1
- First Edition (October 2007) 2
- 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
- Introduction 7
- 1.5 Notational Conventions 9
- Table 1-1 10
- Table 1-1 (Continued) 11
- System Overview 17
- 2.2 Features 18
- Table 2-1 19
- 2.3 System Architecture 20
- 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
- 2.3.9 Graphics Subsystem 26
- 2.3.10 Audio Subsystem 26
- 2.4 Specifications 27
- Table 2-8 28
- Physical Specifications 28
- Table 2-9 29
- Table 2-10 30
- Optical Drive Specifications 30
- Table 2-11 31
- Hard Drive Specifications 31
- Processor/Memory Subsystem 33
- 3.2 Intel Processors 34
- 3.3 Memory Subsystem 36
- 3.3.1 Memory Upgrading 37
- System Support 39
- Software/Driver Layer 41
- Transaction Protocol Layer 41
- 4.2.3 Option ROM Mapping 42
- 4.2.4 PCI Interrupts 42
- 4.2.6 PCI Connectors 43
- PCI Express Connectors 44
- 4.3 System Resources 45
- 4.3.2 Direct Memory Access 46
- 4.4.1 Clearing CMOS 47
- 4.5 System Management 48
- Power-On / Setup Password 49
- Setup Password 49
- Cable Lock Provision 49
- I/O Interface Security 49
- Chassis Security 49
- 4.5.2 Power Management 50
- 4.5.3 System Status 51
- 4.6.1 System I/O Map 52
- 4.6.2 GPIO Functions 53
- I/O Controller Functions 54
- Input/Output Interfaces 55
- 5.2 SATA Interface 56
- 5.3 PATA Interface 57
- 5.4 Diskette Drive Interface 58
- Table 5-3 59
- 5.5 Serial Interface 60
- 5.6 Parallel Interface 61
- Table 5-5 62
- Table 5-6 64
- 5.8.1 USB Connector 65
- 5.8.2 USB Cable Data 66
- 5.9 Audio Subsystem 67
- 5.9.1 HD Audio Controller 68
- 5.9.2 HD Audio Link Bus 68
- 5.9.3 Audio Multistreaming 68
- 5.9.4 Audio Specifications 69
- 5.10.1 Wake-On-LAN Support 71
- 5.10.4 NIC Connector 72
- 5.10.5 NIC Specifications 72
- Integrated Graphics Subsystem 73
- 6.2 Functional Description 74
- Controller 74
- 6.3 Display Modes 76
- 6.4 Upgrading 77
- 6.5 Monitor Connectors 78
- Table 6-4 79
- Power and Signal Distribution 81
- 7.2.2 SFF Power Distribution 82
- Table 7-2 83
- 7.2.3 CMT Power Distribution 84
- 7.2.4 Energy Star Compliancy 85
- 7.3 Power Con trol 86
- Table 7-5 87
- Power Button Actions 87
- Power LED Condition 87
- 7.3.2 Wake Up Events 88
- 7.3.3 Power Management 89
- 7.4 Signal Distribution 90
- Table 7-7. (Continued) 91
- SYSTEM BIOS 93
- 8.2 ROM Flashing 94
- 8.3 Boot Functions 95
- 8.3.4 Boot Error Codes 96
- Table 8-2 97
- 8.4.1 System ID and ROM Type 98
- 8.4.2 Temperature Status 98
- 8.4.3 Drive Fault Prediction 98
- 8.5 SMBIOS 99
- 8.6 USB Legacy Support 100
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