
82801AA and 82801AB Datasheet
5-107
Functional Description
Note that throughout this document, references to D31:F5 indicate that the audio function exists in
PCI device 31, function 5. References to D31:F6 indicate that the modem function exists in PCI
device 31, function 5.
PCI Audio
Function
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 channels on slots 3,4)
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)
PCI Modem
function
Read/write access to modem codec registers 3Ch-58h and vendor registers 5Ah–7Eh
16-bit mono modem line1 output and input, up to 48 kHz (slot 5)
Low latency GPIO[15:0] via hardwired update between slot 12 and PCI IO register
Programmable PCI interrupt on modem GPIO input changes via slot 12 GPIO_INT
SCI event generation on primary or secondary SDIN wake-up signal
AC-link
AC’97 2.1 compliant AC-link interface
Variable sample rate output support via AC’97 SLOTREQ protocol (slots 3,4,5)
Variable sample rate input support via monitoring of slot valid tag bits (slots 3,4,5,6)
3.3 V digital operation meets AC’97 2.1 DC switching levels
AC-Link IO driver capability meets AC‘97 2.1 dual codec specifications
Codec register status reads must be returned with data in the next AC-link frame, per
AC’97 2.1 spec.
Multiple Codec
Dual codec addressing: All AC’97 codec register accesses are addressable to codec
ID 00 (primary) or codec ID 01 (secondary)
Dual codec receive capability via primary and secondary SDIN pins
(primary, secondary SDIN frames are internally validated, synch’d, and OR’d)
Table 5-81. Featured Supported by ICH
Feature
Description
Figure 5-17. ICH Based AC’97 2.1
Audio In (Record)
Audio Out (Playback)
Modem
PC
Mic.