82801DB Datasheet, PDF (227/587 Pages) Intel Corporation – Intel 82801DB I/O Controller Hub 4 (ICH4)

Functional Description
Table 5-98. Host Notify Format
Bit
Description
Driven by
1 Start
External Master
2–8 SMB Host Address – 7 bits External Master
9 Write
10 ACK (or NACK)
External Master
Intel^®ICH4
11–17 Device Address – 7 bits External Master
18 Unused – Always 0
19 ACK
20–27 Data Byte Low – 8 bits
28 ACK
29–36 Data Byte High – 8 bits
37 ACK
38 Stop
External Master
ICH4
External Master
ICH4
External Master
ICH4
External Master
Comment
Always 0001_000
Always 0
ICH4 NACKs if HOST_NOTIFY_STS is 1
Indicates the address of the master; loaded
into the Notify Device Address Register
7-bit-only address; this bit is inserted to
complete the byte
Loaded into the Notify Data Low Byte
Register
Loaded into the Notify Data High Byte
Register
5.19
AC ’97 Controller Functional Description (Audio
D31:F5, Modem D31:F6)
All references to AC ’97 in this document refer to the Audio Codec ’97 Component Specification,
Revision 2.3. For further information on the operation of the AC-link protocol, see the AC ’97
specification.
The ICH4 AC ’97 controller features include:
• Independent PCI functions for audio and modem.
• Independent bus master logic for dual Microphone input, dual PCM Audio input (2-channel
stereo per input), PCM audio output (2-, 4- or 6-channel audio), Modem input, Modem output
and S/PDIF output.
• 20-bit sample resolution.
• Multiple sample rates up to 48 kHz.
• 16 GPIOs.
• Single modem line.
• Configure up to three codecs with three AC_SDIN pins.
Table 5-99 shows a detailed list of features supported by the ICH4 AC ’97 digital controller.
Intel^® 82801DB ICH4 Datasheet
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