Cirrus Logic CK4970x4 - Manual (Page 38)

Programming the DSP on the CK49x Evaluation Board
CK49x User’s Manual
DS898CK7 Copyright 2012 Cirrus Logic, Inc 4-4
4.3.2 Analog Audio Input
To deliver data to the DSP via 6ch ADC, select “Analog” as the Input Source following the same steps
used in selecting SPDIF as described in the previous section. Double click the “Audio In” block to see the
signal flow. Right-clicking the “ADC” block and selecting Device Properties will display the CODEC
Properties
dialog as illustrated in Figure 4-6 . The Master/Slave property must always be set to Master to
indicate that the ADC will master SCLK and LRCLK as described in Section 1.3.20 “Audio Clocking” on
page 1-10.
Figure 4-6. CK49x Analog Properties
The dialog windows of both SPDIF RX Properties and CODEC Properties allow the user to set the
following parameters:
• Input Sampling Frequency Range - Select the Fs range of the ADC on the CS42448 CODEC in
accordance to the input stream where
- 1FS = 32 kHz, 44.1 kHz, or 48 kHz
- 2Fs = 64 kHz, 88.2 kHz, or 96 kHz
- 4FS= 128 kHz, 176.4 kHz, or 192 kHz
• Master/Slave settings for the SCLK & LRCLK pins on the CS8416.
• SPDIF input only Mux: RX0 - RX3, and ‘NONE’. Choosing ‘NONE’ forces the CS8416 to pass the
DSP clock that comes in on the OMCK pin to MUXED_MCLK (RMCK). Use this setting when using
the ADC.
• Analog input only - Enable microphone input.