307013-003 Datasheet, PDF (721/848 Pages) Intel Corporation – Intel I/O Controller Hub 7

Intel® High Definition Audio Controller Registers (D27:F0)
19.1.34 DEVC—Device Control Register
(Intel^® High Definition Audio Controller—D27:F0)
Address Offset: 78h–79h
Default Value: 0800h
Attribute:
Size:
R/W, RO
16 bits
Bit
Description
15 Reserved
14:12
Max Read Request Size — RO. Hardwired to 0 enabling 128B maximum read request
size.
No Snoop Enable (NSNPEN) — R/W.
0 = The Intel^® High Definition Audio controller will not set the No Snoop bit. In this
case, isochronous transfers will not use VC1 (VCi) even if it is enabled since VC1 is
11
not snooped. Isochronous transfers will use VC0.
1 = The Intel High Definition Audio controller is permitted to set the No Snoop bit in the
Requester Attributes of a bus master transaction. In this case, VC0 or VC1 may be
used for isochronous transfers.
Note: This bit is not reset on D3_HOT to D0 transition; however, it is reset by PLTRST#.
10
Auxiliary Power Enable — RO. Hardwired to 0, indicating that Intel High Definition Audio
device does not draw AUX power
9 Phantom Function Enable — RO. Hardwired to 0 disabling phantom functions.
8 Extended Tag Field Enable — RO. Hardwired to 0 enabling 5-bit tag.
7:5 Max Payload Size — RO. Hardwired to 0 indicating 128B.
4 Enable Relaxed Ordering — RO. Hardwired to 0 disabling relaxed ordering.
3 Unsupported Request Reporting Enable — RO. Not implemented. Hardwired to 0.
2 Fatal Error Reporting Enable — RO. Not implemented. Hardwired to 0.
1 Non-Fatal Error Reporting Enable — RO. Not implemented. Hardwired to 0.
0 Correctable Error Reporting Enable — RO. Not implemented. Hardwired to 0.
19.1.35 DEVS—Device Status Register
(Intel^® High Definition Audio Controller—D27:F0)
Address Offset: 7Ah–7Bh
Default Value: 0010h
Attribute:
Size:
RO
16 bits
Bit
Description
15:6
5
4
3
2
1
0
Reserved
Transactions Pending — RO.
0 = Indicates that completions for all non-posted requests have been received.
1 = Indicates that Intel^® High Definition Audio controller has issued non-posted
requests that have not been completed.
AUX Power Detected — RO. Hardwired to 1 indicating the device is connected to resume
power.
Unsupported Request Detected — RO. Not implemented. Hardwired to 0.
Fatal Error Detected — RO. Not implemented. Hardwired to 0.
Non-Fatal Error Detected — RO. Not implemented. Hardwired to 0.
Correctable Error Detected — RO. Not implemented. Hardwired to 0.
Intel ^® ICH7 Family Datasheet
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