Cirrus Logic CK4970x4 - Manual (Page 42)

Programming the DSP on the CK49x Evaluation Board
CK49x User’s Manual
DS898CK7 Copyright 2012 Cirrus Logic, Inc 4-8
This dialog allows the user to set the following parameters for the CK49x Audio Output:
• LRCLK polarity - Select the phase of LRCLK when the left-sample will be shifted out.
• SCLK polarity - Select which edge of SCLK for which the output data will be valid.
• DAO1/DAO2 - Select independent or unified clock domains for the DAO1 and DAO2 audio output
ports.
• MCLK/SCLK Ratios - Select the ratio of LRCLK to MCLK, and LRCLK to SCLK.
4.4.2 Changing Serial Control Protocol (I
2
C

or SPI

) / Memory Usage
The CK49x is designed to communicate using either I
2
C or SPI protocols. In order to change the
communication mode in DSP Composer, go to the menu bar and select File  Properties, which brings up
the Project Properties dialog. To configure Memory usage click on the Advanced button, as illustrated in
Figure 4-11 . Max memory allocation and external memory can be enabled from this panel.
Figure 4-11. CK49x Comm Mode / Memory Usage