82801FB Datasheet, PDF (226/786 Pages) Intel Corporation – Intel I/O Controller Hub 6 (ICH6) Family

Functional Description
5.22 AC ’97 Controller (Audio D30:F2, Modem D30:F3)
Note: All references to AC ’97 in this document refer to the AC ’97 Specification, Version 2.3. For further
information on the operation of the AC-link protocol, see the AC ’97 Specification, Version 2.3.
The ICH6 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
• Support for 16 codec-implemented GPIOs
• Single modem line
• Configure up to three codecs with three ACZ_SDIN pins
Table 5-56 shows a detailed list of features supported by the ICH6 AC ’97 digital controller.
.
Table 5-56. Features Supported by Intel^® ICH6 (Sheet 1 of 2)
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 20-bit and 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
• 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 PCI Power Management
• Read/write access to audio codec registers 00h–3Ah and vendor registers 5Ah–7Eh
• 20-bit stereo PCM output, up to 48 kHz (L,R, Center, Sub-woofer, L-rear and R-rear
channels on slots 3,4,6,7,8,9,10,11)
• 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 ACZ_RST# is held low until after POST and software de-assertion
of ACZ_RST# (supports passive PC_BEEP to speaker connection during POST)
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Intel^® I/O Controller Hub 6 (ICH6) Family Datasheet