Cirrus Logic CRD48L10 - Manual (Page 16)

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3.1 S1 Button Control (No LCD)
Figure 3-2. CRD48L10-4in4out S1 Control Only
3.1.2 Selecting Input Audio Source
Input selection is controlled with the S1 button, as shown in Fig 3-3, on the CRD48L10 board. By default, the Input will
DSP play back an MP3 from on-board FLASH U9. There is an LED next to each input to indicate which input is active,
except when in FLASH playback where no input LED will be illuminated.
Figure 3-3. S1 Input Selection Button