stac9723t ETC-unknow, stac9723t Datasheet - Page 28

• Manufacturer Part Number: stac9723t
• Description: Stereo Ac 97 Codec With Multi-codec Option
• Manufacturer: ETC-unknow

SigmaTel, Inc.
4.4.14 Clock Access (Index 76h and 78h)
4.4.15 Vendor ID1 and ID2 (Index 7Ch and 7Eh)
04/07/00
The Clock Access register (index 78h) is a locked register and can only be properly
written and read from when ABBAh has been written into register 76h.
STAC9744/45 can operate as a remotely located secondary without a 24.576MHz master
clock input or local crystal. The STAC9744/45 can synchronize to the BIT_CLK after a
register adjustments. The first adjustment starts the synchronization process by enabling
the ALTCLK D13, PWD CL2x D12, CLK INV D11, and OSC PWD D1 bits of register
78h. With this adjustment, the STAC9744/45 will operate remotely without the 24.576
MHz master clock signal and without a local crystal. The XTAL_IN input should be
connected to DGND with a 10kΩ or larger resistor. The reserved bits of register 78h
should not be written to.
These two registers contain four 8-bit ID codes. The first three codes have been assigned
by Microsoft using their Plug and Play Vendor ID methodology. The fourth code is a
SigmaTel, Inc. assigned code identifying the STAC9721/23. The ID1 register (index
7Ch) contains the value 8384h, which is the first (83h) and second (84h) characters of the
Microsoft
third (76h) of the Microsoft
NOTE: The lower half of the Vendor ID2 register (index 7Eh) currently contains the
value 09h identifying the STAC9721/23. This value can be used by the audio driver, or
miniport driver in the case of WIN98
feature-set of the STAC9721/23. This portion of the register will likely contain different
CID1 = DVdd
CID0 = DVdd
CID1 = DVdd
CID1 = GND,
CID0 = DVdd
CID1 = GND,
CID0 = GND
CID0 = GND
CID1, CID0
or floating,
or floating,
or floating
or floating
External
Pins
®
ID code. The ID2 register (index 7Eh) contains the value 7609h, which is the
Extended
Audio ID
ID1, ID0
28h
0, 0
0, 1
1, 0
1, 1
Table 19
®
. Multi-Channel Programming Register
ID code, and 09h which is the STAC9721/23 ID code.
Secondary, 01
Secondary, 10
Secondary, 11
Designation
Primary, 00
Data Sheet
Codec
®
28
, to adjust software functionality to match the
MC1, MC0
Selection
Channel
Multi-
74h
0, 0
0, 1
1, 0
1, 1
0, 0
0, 1
1, 0
1, 1
0, 0
0, 1
1, 0
1, 1
0, 0
0, 1
1, 0
1, 1
OUT Left
Slot 10
Slot 10
Slot 10
Slot 10
PCM
Slot 3
Slot 7
Slot 6
Slot 3
Slot 7
Slot 6
Slot 7
Slot 3
Slot 6
Slot 6
Slot 3
Slot 7
STAC9721
Slot 11
Slot 11
Slot 11
Slot 11
Right
PCM
Slot 4
Slot 8
Slot 9
Slot 4
Slot 8
Slot 9
Slot 8
Slot 4
Slot 9
Slot 9
Slot 4
Slot 8
OUT
04/07/00
The