CS494502 datasheet(80/100 Pages) CIRRUS

80 / 100 page

The following tables show the different values for

each parameter as well as the hex message that

needs to be sent. When creating the hardware

configuration message, only one hex message

should be sent per parameter. It should be noted

that the entire B parameter hex message must be

sent, even if one of the input ports has been defined

as unused by the A parameter.

11.4.1

Input Configuration Considerations

1) 24-bit PCM input requires at least 24 SCLKs

per sub-frame. The DSP always uses 24-bit

resolution for PCM input. Systems having less

than 24-bit resolution will not have a problem

as the extra bits taken by the DSP will be under

the noise floor of the input signal for left

justified and I2S formats. For compressed

input, data is always taken in 16 bit word

lengths.

2) 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

A Value

Data Type

Hex

Message

(default)

DAI - PCM

CDI - Compressed

0x800210

0x3FBFC0

0x800110

0x80002C

DAI - PCM and Compressed

CDI - Unused

0x800210

0x3FBFC0

0x800110

0xC0002C

DAI - Unused

CDI - PCM

0x800210

0x3FBFC0

0x800110

0x800020

Table 20. Input Data Type Configuration

(Input Parameter A)

B Value

Data Format

Hex

Message

(default)

PCM - I2S 24-bit

Compressed - I2S 16-bit

Compressed means any type of com-

pressed data such as IEC61937-

packed AC-3, DTS, MPEG Multichan-

nel, AAC or MP3 elementary stream

data from a DVD or IEC60958-packed

elementary stream DTS data from a

DTS-CD)

0x800217

0x8080FF

0x80021A

0x8080FF

0x800117

0x011100

0x80011A

0x011900

Table 21. Input Data Format Configuration

(Input Parameter B)

PCM - Left Justified 24-bit

Compressed - Left Justified

16-bit

(Compressed means any type of

compressed data such as IEC61937-

packed AC-3, DTS, MPEG

Multichannel, AAC or MP3 elementary

stream data from a DVD or IEC60958-

packed elementary stream DTS data

from a DTS-CD)

0x800217

0x8080FF

0x80021A

0x8080FF

0x800117

0x001000

0x80011A

0x001800

CValue

SCLK Polarity (Both CDI and

DAI Port)

Hex

Message

(default)

Data ClockedinonRising

Edge

0x800217

0xFFFFDF

0x80021A

0xFFFFDF

Data Clocked in on Falling

Edge

0x800117

0x000020

0x80011A

0x000020

Table 22. Input SCLK Polarity Configuration

(Input Parameter C)

B Value

Data Format

Hex

Message

Table 21. Input Data Format Configuration

(Input Parameter B) (Continued)

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