82NM10 Datasheet, PDF (618/671 Pages) Intel Corporation – Intel® NM10 Family Express Chipset

Intel HD Audio Controller Registers (D27:F0)
Bit
Description
15:8
7:0
Reserved.
FIFO Size — RO (Input stream), R/W (Output stream). This field indicates the
maximum number of bytes that could be fetched by the controller at one time. This is
the maximum number of bytes that may have been DMA’d into memory but not yet
transmitted on the link, and is also the maximum possible value that the PICB count
will increase by at one time.
The value in this field is different for input and output streams. It is also dependent on
the Bits per Samples setting for the corresponding stream. Following are the values
read/written from/to this register for input and output streams, and for non-padded
and padded bit formats:
Output Stream R/W value:
Value
0Fh = 16B
1Fh = 32B
3Fh = 64B
7Fh = 128B
BFh = 192B
FFh = 256B
Output Streams
8, 16, 20, 24, or 32 bit Output Streams
8, 16, 20, 24, or 32 bit Output Streams
8, 16, 20, 24, or 32 bit Output Streams
8, 16, 20, 24, or 32 bit Output Streams
8, 16, or 32 bit Output Streams
20, 24 bit Output Streams
NOTES:
1.
All other values not listed are not supported.
2.
When the output stream is programmed to an unsupported size, the hardware
sets itself to the default value (BFh).
3.
Software must read the bit field to test if the value is supported after setting the
bit field.
Input Stream RO value:
Value
Input Streams
77h = 120B
9Fh = 160B
8, 16, 32 bit Input Streams
20, 24 bit Input Streams
NOTE: The default value is different for input and output streams, and reflects the
default state of the BITS fields (in Stream Descriptor Format registers) for the
corresponding stream.
18.2.42 SDFMT—Stream Descriptor Format Register
(Intel HD Audio Controller—D27:F0)
Memory Address:Input Stream[0]: HDBAR + 92h
Input Stream[1]: HDBAR + B2h
Input Stream[2]: HDBAR + D2h
Input Stream[3]: HDBAR + F2h
Output Stream[0]: HDBAR + 112h
Output Stream[1]: HDBAR + 132h
Output Stream[2]: HDBAR + 152h
Output Stream[3]: HDBAR + 172h
Attribute: R/W
Default Value:
0000hSize:16 bits
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