CS493102-CL 데이터 시트보기 (PDF) - Cirrus Logic

부품명

상세내역

제조사

CS493102-CL

Multi-Standard Audio Decoder Family

Cirrus Logic 

CS49300 Family DSP

Hex

B Value

Data Format

Message

84

PCM - Left Justified 24-bit 0x800217

0x8080FF

Multichannel PCM (4 Channel) 0x80021A

- Left Justified 20-bit

0x8080FF

(used only by special post-processing 0x800117

application codes)

0x0028C0

0x80011A

0x0018C0

Table 19. Input Data Format Configuration

(Input Parameter B) (Continued)

SCLK Polarity (Both CDI &

C Value

DAI Port)

0

Data Clocked in on Rising

(default) Edge

1

Data Clocked in on Falling

Edge

Hex

Message

0x800217

0xFFFFDF

0x80021A

0xFFFFDF

0x800117

0x000020

0x80011A

0x000020

Table 20. Input SCLK Polarity Configuration

(Input Parameter C)

11.2.1. 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

FIFO Size & Blocksize (no

default - only applicable to

Hex

D Value parallel delivery modes) Message

1

Compressed FIFO B Size - 0x800014

6kbyte

0x280D00

Blocksize - up to 2kbyte

2

PCM FIFO C Size - 6kbyte 0x800014

Blocksize - up to 2kbyte

0x820300

Table 21. Input FIFO Setup Configuration

(Input Parameter D)

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

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 a special feature called “PCM

Robustness” which does alleviate the above

problem, however you should still follow the

above recommendation.

DS339F7

77

Share Link: