CS49310 datasheet(78/86 Pages) CIRRUS

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CS49300 Family DSP

DS339PP4

11.3.1. Output Configuration Considerations

1) All PCM output is 24-bit resolution

2) An SCLK frequency of at least 128Fs must be

selected for the 20-bit multichannel (6 channel)

mode.

3) An SCLK frequency of at least 128Fs must be

selected for the 24-bit multichannel (4 channel)

mode.

4) An SCLK frequency of at least 256Fs must be

selected for the 24-bit multichannel (6 channel)

mode.

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

have

special

feature

called

“PCM

Robustness” which does alleviate the above

problem, however you should still follow the

above recommendation.

11.4. Creating Hardware Configuration

Messages

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

is acceptable. This example can be easily expanded

to fit other system requirements.

For example if the host system has the following

configuration:

Address Checking: Disabled

The

above

configuration

default

configuration message is required.

DAI:

Left Justified

PCM and Compressed data

CDI:

Not used

The above configuration corresponds to

INPUT A1 B1

which corresponds to a configuration message of:

0x800210

0x3FBFC0

0x800110

0xC0002C

0x800217

0x8080FF

0x80021A

0x8080FF

0x800117

0x001000

0x80011A

0x001800

DAO: Left Justified slave mode (LRCLK, SCLK

inputs)

MCLK @ 256Fs

SCLK @ 64Fs

The above configuration corresponds to

OUTPUT A0 B1 C0 D0

which has a configuration message of:

0x80027F

0xFC7FFF

0x80027C

0xF01F00

0x80027D

0xF01F00

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