307013-003 Datasheet, PDF (233/848 Pages) Intel Corporation – Intel I/O Controller Hub 7

Functional Description
Table 5-59. Features Supported by Intel^® ICH7 (Sheet 2 of 2)
Feature
Description
AC-link
Multiple Codec
• AC ’97 2.3 AC-link interface
• Variable sample rate output support via AC ’97 SLOTREQ protocol (slots
3,4,5,6,7,8,9,10,11)
• 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 2.3 DC switching levels
• AC-link I/O driver capability meets AC ’97 2.3 triple codec specifications
• Codec register status reads must be returned with data in the next AC-link frame, per
AC ’97 Specification, Version 2.3.
• Triple codec addressing: All AC ’97 Audio codec register accesses are addressable to
codec ID 00 (primary), codec ID 01 (secondary), or codec ID 10 (tertiary).
• Modem codec addressing: All AC ‘97 Modem codec register accesses are addressable
to codec ID 00 (primary) or codec ID 01 (secondary).
• Triple codec receive capability via ACZ_SDIN[2:0] pins
(ACZ_SDIN[2:0] frames are internally validated, synchronized, and OR’d depending
on the Steer Enable bit status in the SDM register)
• ACZ_SDIN mapping to DMA engine mapping capability allows for simultaneous input
from two different audio codecs.
NOTES:
1.
Audio Codec IDs are remappable and not limited to 00,01,10.
2.
Modem Codec IDs are remappable and limited to 00, 01.
3.
When using multiple codecs, the Modem Codec must be ID 01.
Note:
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 6.
Note:
Throughout this document references to tertiary, third, or triple codecs refer to the
third codec in the system connected to the ACZ_SDIN2 pin. The AC ’97 Specification,
Version 2.3 refers to non-primary codecs as multiple secondary codecs. To avoid
confusion and excess verbiage, this datasheet refers to it as the third or tertiary codec.
Figure 5-12. Intel^® ICH7-Based Audio Codec ’97 Specification, Version 2.3
Audio In (Record)
PC
Audio Out (6 Channel Playback)
S/PDIF* Output
Modem
Mic.2
Mic.1
Intel ^® ICH7 Family Datasheet
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