Cirrus Logic CS4349 - Manual (Page 31)

DS782F2 31
CS4349
8.3.3 Invert Signal Polarity (INVERT_B) Bit 5
Function:
When set to 1, this bit inverts the signal polarity of channel B.
When set to 0 (default), this function is disabled.
This function is only available for Left Justified, Right Justified 16, and Right Justified 24 data formats.
8.3.4 ATAPI Channel Mixing and Muting (ATAPI[3:0]) Bits 3-0
Default = 1001 - AOUTA = aL, AOUTB = bR (Stereo)
Function:
The CS4349 implements the channel mixing functions of the ATAPI CD-ROM specification. Refer to
Table 15 and Figure 21 for additional information.
Table 15. ATAPI Decode
ATAPI_A1 ATAPI_A0 ATAPI_B1 ATAPI_B0 AOUTA AOUTB
0 0 0 0 MUTE MUTE
0 0 0 1 MUTE bR
0 0 1 0 MUTE bL
0 0 1 1 MUTE b[(L+R)/2]
0 1 0 0 aR MUTE
0 1 0 1 aR bR
0 1 1 0 aR bL
0 1 1 1 aR b[(L+R)/2]
 
A Channel
Volume
Control
AoutA
AoutB
Left Channel
Audio Data
Right Channel
Audio Data
B Channel
Volume
Control
MUTE
MUTE
Figure 21. ATAPI Block Diagram