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Programmer’s Reference Manual 29
Intel
®
High Definition Audio Controller Registers (D27:F0)
1.1.33 DEVC—Device Control Register
(Intel
®
High Definition Audio Controller—D27:F0)
Address Offset: 78h–79h Attribute: R/W, RO
Default Value: 0800h Size: 16 bits
1.1.34 DEVS—Device Status Register
(Intel
®
High Definition Audio Controller—D27:F0)
Address Offset: 7Ah–7Bh Attribute: RO
Default Value: 0010h Size: 16 bits
Bit Description
15 Reserved
14:12 Max Read Request Size — RO. Hardwired to 0 enabling 128B maximum read request size.
11
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 never 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.
Bit Description
15:6 Reserved
5
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.
4 AUX Power Detected — RO. Hardwired to 1 indicating the device is connected to resume power.
3 Unsupported Request Detected — RO. Not implemented. Hardwired to 0.
2 Fatal Error Detected — RO. Not implemented. Hardwired to 0.
1 Non-Fatal Error Detected — RO. Not implemented. Hardwired to 0.
0 Correctable Error Detected — RO. Not implemented. Hardwired to 0.