Figure 22. atapi block diagram, 1 atapi channel mixing and muting (atapi) bit 0-3, Table 9. atapi decode – Cirrus Logic CS4360 User Manual
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6.3.1
ATAPI CHANNEL MIXING AND MUTING (ATAPI)
BIT 0-3
Default = 1001 - AOUTAx = L, AOUTBx = R (Stereo)
Function:
The CS4360 implements the channel mixing functions of the ATAPI CD-ROM specification. Refer to
Table 9 and Figure 22 for additional information.
Note:
All mixing functions occur prior to the digital volume control. Mixing only occurs in channel pairs.
ATAPI3
ATAPI2
ATAPI1
ATAPI0
AOUTAx
AOUTBx
0
0
0
0
MUTE
MUTE
0
0
0
1
MUTE
R
0
0
1
0
MUTE
L
0
0
1
1
MUTE
[(L+R)/2]
0
1
0
0
R
MUTE
0
1
0
1
R
R
0
1
1
0
R
L
0
1
1
1
R
[(L+R)/2]
1
0
0
0
L
MUTE
1
0
0
1
L
R
1
0
1
0
L
L
1
0
1
1
L
[(L+R)/2]
1
1
0
0
[(L+R)/2]
MUTE
1
1
0
1
[(L+R)/2]
R
1
1
1
0
[(L+R)/2]
L
1
1
1
1
[(L+R)/2]
[(L+R)/2]
Table 9. ATAPI Decode
Σ
A Channel
Volume
Control
AoutA
AoutB
Left Channel
Audio Data
Right Channel
Audio Data
B Channel
Volume
Control
& Mute
& Mute
Figure 22. ATAPI Block Diagram