Audio Codec '97

AC ‘97 Component Specification Revision 2.3 Rev 1.0

5.7.9 3D Control Register (Index 22h)

Reg Name D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 Default

22h 3D Control X X X X CR3 CR2 CR1 CR0 X X X X DP3 DP2 DP1 DP0 0000h

This optional register is used to control the center and/or depth of the 3D stereo enhancement function built into the

AC ‘97 component. Note this register should be read to indicate if the selected 3D stereo enhancement is of either

fixed or variable center and depth. If this control register is non-zero then the enhancement is fixed. The register

default value is either the fixed value or 0000h if it is variable. Linear or logarithmic implementation is acceptable,

depending on the 3D technology (linear is shown below):

CR3...CR0

DP3...DP0

Center

Depth

0 0%

1 6.67%

. .

14 93.33%

15 100%

Table 26. 3D Control

5.7.10 Audio Interrupt and Paging Mechanism (Index 24h)

Reg Name D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 Default

24h Audio Int. & Paging I4 I3 I2 I1 I0 X X X X X X X PG3 PG2 PG1 PG0 X

This register was originally (AC ’97 1.03) modem sample rate, later reserved (AC ’97 2.0). It is redefined to

support Audio interrupt and register paging mechanism.