CS49400 datasheet(81/100 Pages) CIRRUS

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input FIFO and may result in corrupted data

being heard on the outputs.

Corruption is only an issue when PCM data is

being delivered. When compressed data is

being

delivered,

there

are

sync

words

embedded in the data stream to which the DSP

can lock. Certain application codes that are

capable of processing PCM may now have a

special feature called “PCM Robustness”

which prevents the corruption described above,

but you should still use a FIFO reset to ensure

good data.

11.5 Serial Audio Input

The Serial Audio Input (SAI) provides four stereo

inputs to DSPC. The SAI can be used to post-

process PCM data from a multichannel Super

Audio CD input or DVD Audio/Video input via

high-performance A/Ds. Table 19 shows the

mnemonic, pin name and pin number of the pins

associated with the SAI port on the CS49400.

The SAI has 4 stereo data inputs that are fully

configurable including support for I2S, left-

justified and multichannel formats. The SAI port

operates in slave mode only with LRCLKN and

SCLKN as inputs. Processing on the CDI and DAI

ports must be disabled before the SAI port is

enabled. Either the input D0 or D1 message must

be sent to DSPC to configure and enable the SAI

port.

11.6 Digital Audio Output Port

The Digital Audio Output port (DAO) can transmit

up to 16 channels of PCM data that are fully

configurable into standard audio format. It also has

two IEC60958 pins that provide CMOS level bi

phase encoded outputs. Table 25 shows the signals

associated with the DAO. As with the input ports

the clocks and data are fully configurable via

hardware configuration. All DAO configuration

messages must be sent to DSPC.

Pin Name

Pin Description

144-Pin

Package,

Number

100-Pin

Package,

Number

SCLKN

Serial Bit Clock

LRCLKN

Frame Clock

SDATAN3

Serial Data In 3

SDATAN2

Serial Data In 2

SDATAN1

Serial Data In 1

SDATAN0

Serial Data In 0

Table 23. Serial Audio Input Port

D Value

Data Type

Hex Message

PCM - I2S 24-bit

0x81000010

0x00000001

0x81000011

0x00011701

0x81000012

0x00004E4F

PCM - Left Justified 24-bit

0x81000010

0x00000001

0x81000011

0x00001600

0x81000012

0x00005E4F

Table 24. SAI Data Type Configuration

(Input Parameter D)

Pin Name

Pin Description

144-Pin

Number

100-Pin

Number

MCLK

Master Clock

SCLK1

Serial Bit Clock for

AUDATA 4-7

LRCLK1

Frame Clock for

AUDATA 4-7

AUDATA7,X

MT958B

Serial Data Out 7,

IEC60958 Trans-

mitter

AUDATA6

Serial Data Out 6

AUDATA5

Serial Data Out 5

AUDATA4

Serial Data Out 4

102

Table 25. Digital Audio Output Port

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