Cirrus Logic CK4970x4 - Manual (Page 33)

3-6 Copyright 2012 Cirrus Logic, Inc. DS898CK7
Installation, Setup, and Running First Application
CK49x User’s Manual
3.1.5 Running a Stereo PCM Application on CK49x
Figure 3-6 shows the DSP Composer™ main window for a PCM pass-through application on the CK49x.
The blocks shown in the main window of DSP Composer™ can be selected from the folders in the left-
hand window pane, and then connected together by “wires” to indicate the processing path as shown
The “Audio In” and “Audio Out” blocks represent the hardware ports that need to be configured. The
“Audio In” block is used to select the S/PDIF Input or Analog or HDMI input that is to be processed, and
configure the digital audio format for the CS42526’s ADC, SiI9135 HDMI Rx, and the CS4953x4 DAI port.
The “Audio Out” block is used to configure the digital audio format for the CS495xxx/CS497xxx DAO port,
the CS4252’s8 DACs, and enable or disable the S/PDIF TX output of the CK49x.
Figure 3-6. PCM Pass-through Example Application
To run a stereo PCM application on the CK49x Evaluation System, follow these steps:
1. Launch DSP Composer
- If DC4953xxx is used, Start  Program  Cirrus DSP  CS495xxx/CS497xxx
- If DC4970x4 is used, Start  Program  Cirrus DSP  CS497x
2. In DSP Composer, go to File  Open and open
C:\CirrusDSP\CS4953X\projects\<pcm_spp_spdif_input_49xxx>.cpa. depending on the DSP
daughter card used on the CK49x evaluation platform.
3. Press the GO button
4. Insert PCM material into the DVD player (e.g. music CD). If a DVD is being used as the audio source,
make sure that the DVD Player (or other digital audio source) is configured to output PCM data and
S/PDIF out of the player connected to RX0 on the board.
5. Press Play on the DVD player (or other digital audio source). You should now hear audio from the
speakers.
Note:
Click on File->Properties in DSPComposer and make sure the board connected field is set to
CDB49x