Cirrus Logic CS4970x4 - Manual (Page 78)

4-4 Copyright 2013 Cirrus Logic, Inc. DS810UM6
Digital Audio Output Port Description
CS4953x4/CS4970x4 System Designer’s Guide
4.2.3.3 One-line Data Mode Format (Multichannel)
The CS4953x4/CS4970x4 is capable of multiplexing all digital audio outputs on one line, as illustrated in
Figure 4-4 . This mode is available only through special request. Please contact your local Cirrus
representative for further details.
Figure 4-4. One-line Data Mode Digital Audio Formats
4.2.4 DAO Hardware Configuration
DAO hardware configuration must be done at design time using DSP Condenser. See Chapter 8, "DSP
Condenser" for more details.
4.2.5 DAO Hardware Naming Convention
The DAO naming convention is as follows:
OUTPUT A B C D E F
where the parameters are defined as:
• A - DAO Clock Mode (Master/Slave for DAO_LRCLK and DAO_SCLK)
• B - DAO1/DAO2 Clock Relationship
• C - DAO_MCLK, DAO_SCLK, DAO_LRCLK Frequency Ratio
• D - Data Format (I2S, Left Justified)
• E - DAO_LRCLK Polarity
• F - DAO_SCLK Polarity
• G - Output Channel Configuration
Table 4-2 , Table 4-3 , Table 4-4 , Table 4-5 , Table 4-6 , and Table 4-7 show the different values for each
parameter as well as the hex message that needs to be sent to configure the port. When creating the
hardware configuration message, only one hex message should be sent per parameter.
Note:All DAO hardware config messages must be sent to DSPB. For more details on sending
messages to DSP B refer to AN288, section 2.1.4
DAO_LRCLK
DAO_SCLK
DAO_DATA M S B L SB
M Cloc k s
Pe r C ha n ne l
M SB L S B
M Cloc k s
Pe r Cha n nel
M Cloc k s
Pe r C ha n ne l
M SB L S B
M C loc k s
Pe r C ha nne l
M S B L SB
M Cloc k s
Pe r C ha n ne l
M S B L SB
M Cloc k s
Pe r C ha n nel
M S B L SB M S B