SAF784X datasheet(39/93 Pages) NXP

39 / 93 page

SAF784X_2

Product data sheet

Rev. 02 — 9 May 2008

39 of 93

NXP Semiconductors

SAF784x

One chip CD audio device with integrated MP3/WMA decoder

The serial format consists of a pause bit followed by a start bit, followed by data bits. The

format of the data is explained in Table 10.

Bit length: seven sysclk periods.

Frame length: 11 bits.

[1]

The CFLG repetition rate is not ﬁxed and depends on disc speed and output interface speed. There is

always at least one pause bit.

[2]

Cormode deﬁnition: ‘000’: C1 correction, ‘011’: C2 correction, ‘100’: corrector not active, Others: not used.

[3]

FlagFail and CorFail indicate failure status on previous code word.

[4]

ErrorCount indicates the number of errors found by the error corrector.

6.5.8.2

BLER counters

There are two BLER counters which count the number of frames C1 and C2, with at least

one error. C2 erasures coming from C1 are also counted; it is irrelevant if the frame was

correctable or not.

These registers are reset on read, and the user is responsible for reading them at regular

intervals. The BLER counters can be read by registers C1Bler and C2Bler.

6.5.9 Audio back end and data output interfaces

The channel decoder back end is shown in Figure 20.

Table 10.

Format description of CFLG serial bus

Bit

Value

Meaning

Note

start bit

[1]

1 to 3

Cormode[2:0]

type of correction

[2]

FlagFail

failure ﬂag set because

correction too unsafe

[3]

CorFail

failure ﬂag set because

correction impossible

[3]

9, 6 to 8

ErrorCount[3:0]

number of errors

corrected

[4]

pause bit

[1]

Fig 20. Backend audio functions

001aag324

to I2S

handler

I2S

left kill

right kill

INTERPOLATE

/HOLD

DE-EMPHASIS

SOFT

MUTE

ERROR

DETECT

SILENCE

DETECT

KILL

GENERATION

UPSAMPLE

HARD

MUTE

MEMORY

PROCESSOR

EBU

INTERFACE

I2S

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