Cirrus Logic CK4970x4 - Manual (Page 37)

4-3 Copyright 2012 Cirrus Logic, Inc. DS898CK7
Programming the DSP on the CK49x Evaluation Board
CK49x User’s Manual
4.3 Changing Audio Input Source
The active audio input to the CK49x is selected through the “Audio In” block in DSP Composer, this is
done by right-clicking on the “Audio In” block and selecting Device Properties, as illustrated in Figure 4-4 .
Figure 4-4. CK49x Audio In Properties
This dialog allows the user to set the following parameters for the CK49x:
• Input Source - S/PDIF, Analog, or USB
• Audio Data Format - I
2 S, LJ, etc.
4.3.1 S/PDIF Audio Input
The CK49x has four different S/PDIF input jacks. Select the SPDIF input by right-clicking the “Audio In”
block and selecting “SPDIF” as the Input Source. Double click the Audio In block to see the signal flow.
Selecting the “SPDIF” block followed by right-clicking and selecting Device Properties will display the
SPDIF Rx Properties
dialog as illustrated in Figure 4-5 .The Master/Slave property must always be set to
Master to indicate that the SPDIF transmitter masters MCLK, SCLK, and LRCLK as described in Section
1.3.20 “Audio Clocking” on page 1-10 .
Figure 4-5. CK49x S/PDIF Rx Properties