CS49300 Family DSP
is acceptable. This example can be easily expanded
to fit other system requirements.
11.3.1. Output Configuration Considerations
1) All PCM output is 24-bit resolution
For example if the host system has the following
configuration:
2) An SCLK frequency of at least 128Fs must be
selected for the 20-bit multichannel (6 channel)
mode.
Address Checking: Disabled
The above configuration is default so no
configuration message is required.
3) An SCLK frequency of at least 128Fs must be
selected for the 24-bit multichannel (4 channel)
mode.
DAI: Left Justified
PCM and Compressed data
4) An SCLK frequency of at least 256Fs must be
selected for the 24-bit multichannel (6 channel)
mode.
CDI: Not used
The above configuration corresponds to
INPUT A1 B1
5) If the clocks to the audio ports are known to be
corrupted, such as when a S/PDIF receiver goes
out of lock, the DSP should undergo an
application restart (if applicable), soft reset or
hard reset. All three actions will result in the
input FIFO being reset. Failure to do so may
result in corrupted data being latched into the
input FIFO and may result in corrupted data
being heard on the outputs. This is not an issue
when compressed data is being delivered, as it
has sync words embedded in the stream which
the DSP can lock to, but only when PCM data
is being delivered. Certain application codes
that are capable of processing PCM may now
which corresponds to a configuration message of:
0x800210
0x3FBFC0
0x800110
0xC0002C
0x800217
0x8080FF
0x80021A
0x8080FF
0x800117
0x001000
0x80011A
0x001800
have
a
special feature called “PCM
Robustness” which does alleviate the above
problem, however you should still follow the
above recommendation.
DAO: Left Justified slave mode (LRCLK, SCLK
inputs)
MCLK @ 256Fs
SCLK @ 64Fs
11.4. Creating Hardware Configuration
Messages
The above configuration corresponds to
OUTPUT A0 B1 C0 D0
The single hardware configuration message that
must be sent to the CS493XX after download or
soft reset should be a concatenation of the
messages in the previous sections. The complete
hardware configuration message should be created
by taking a message for each parameter (where the
default is not acceptable) and concatenating the
messages together. No messages need to be sent if
the default configuration for a particular parameter
which has a configuration message of:
0x80027F
0xFC7FFF
0x80027C
0xF01F00
0x80027D
0xF01F00
78
DS339PP4
CIRRUS [ CIRRUS LOGIC ]
