82801CA Datasheet, PDF (212/521 Pages) Intel Corporation – I/O Controller Hub 3-S (ICH3-S)

Functional Description
5.18 AC ’97 Controller Functional Description
(Audio D31:F5, Modem D31:F6)
Note: All references to AC ’97 in this document refer to the Audio Codec ’97, Revision 2.2 specification.
For further information on the operation of the AC-link protocol, please see the Audio Codec ’97,
Revision 2.2 specification.
The ICH3 AC ’97 Controller features include:
• Independent PCI functions for audio and modem.
• Independent bus master logic for Mic input, PCM Audio input (2-channel stereo), PCM audio
output (2, 4 or 6-channel stereo), Modem input and Modem output.
• 16-bit sample resolution
• Multiple sample rates up to 48 kHz
• 16 GPIOs
• Single modem line
• Dual codec configuration with two SDIN pins
Table 5-97 shows a detailed list of features supported by the ICH3 AC ’97 digital controller.
.
Table 5-97. Features Supported by Intel^® ICH3
Feature
System Interface
Power
Management
PCI Audio
Function
Description
• Isochronous low latency bus master memory interface
• Scatter/gather support for word-aligned buffers in memory
(all mono or stereo 16-bit data types are supported, no 8-bit data types are supported)
• Data buffer size in system memory from 3 to 65535 samples per input
• Data buffer size in system memory from 0 to 65535 samples per output
• Independent PCI audio and modem functions with configuration and I/O spaces
• AC ’97 codec registers are shadowed in system memory via driver (not PCI I/O
space)
• AC ’97 codec register accesses are serialized via semaphore bit in PCI I/O space
(new accesses are not allowed while a prior access is still in progress)
• Power management via ACPI control methods
Support for audio states: D0, D2, D3hot, D3cold
Support for modem states: D0, D3hot, D3cold
• SCI event generation for PCI modem function with wake-up from D3cold
• Independent codec D3 w/ Link down event, synchronized via two-bit semaphore (in
PCI I/O Space)
• Read/write access to audio codec registers 00h–3Ah and vendor registers 5Ah–7Eh
• 16-bit stereo PCM output, up to 48 kHz (L,R, Center, Sub-woofer, L-rear and R-rear
channels on slots 3,4,6,7,8.9)
• 16-bit stereo PCM input, up to 48 kHz (L,R channels on slots 3,4)
• 16-bit mono mic in w/ or w/o mono mix, up to 48 kHz (L,R channel, slots 3,4) (mono
mix supports mono hardware AEC reference for speakerphone)
• 16-bit mono PCM input, up to 48 kHz from dedicated mic ADC (slot 6)
(supports speech recognition or stereo hardware AEC ref for speakerphone)
• During cold reset AC_RST# is held low until after POST and software deassertion of
AC_RST# (supports passive PC_BEEP to speaker connection during POST)
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Intel^® 82801CA ICH3-S Datasheet