CS42428
Each of the GPO1-GPO7 can be programmed to provide a hardware MUTE signal to individual circuits.
Each pin can be programmed as an output, with specific muting capabilities as defined by the function bits
in the register “General Purpose Pin Control (addresses 29h to 2Fh)” on page 48.
3.3.4 ATAPI Specification
The CS42428 implements the channel mixing functions of the ATAPI CD-ROM specification. The
ATAPI functions are applied per A-B pair. Refer to Table 15 on page 44 and Figure 5 for additional infor-
mation.
A Channel
Volume
Control
Left Channel
Audio Data
MUTE
AOUTAx
Σ
Σ
DAC_SDINx
B Channel
Volume
Control
Right Channel
Audio Data
AOUTBx
MUTE
Figure 5. ATAPI Block Diagram (x = channel pair 1, 2, 3, 4)
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CIRRUS [ CIRRUS LOGIC ]
