WM8802 datasheet(29/65 Pages) WOLFSON

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WM8802

PP Rev 1.1 April 2004

DATA

PLL LOCK

ERROR

INPUT PARITY

ERROR (A)

INPUT PARITY

ERROR (B)

INPUT PARITY

ERROR (C)

RDATA output

Low

Previous value data

Output

fs calculation result

Low

Output

Channel status

Low

Previous value data

Validity flag

Low

Output

User data

Low

Output

Table 11 Data Processing upon Error Occurrence

Notes:

Input parity error (A): Occurs 9 or more times in succession

Input parity error (B): Occurs 8 or fewer times in succession, in case of audio data

Input parity error (C): Occurs 8 or fewer times in succession, in case of non-PCM burst data

Figure 20 shows an example of data processing upon occurrence of a parity error.

RERR

RDATA

R-ch

Previous data value

Input Data

RLRCK

An error occurs a single time

Muted after 9 or more

consecutive errors

L-ch R-ch ….

Previous data value

R-2

L-2

R-0

L-1

R-0

L-0

L-2 R-2 L-2 R-2 L-2 R-2 L-2 R-2

L-4

R-3

L-3

R-2

L-2

R-1

R-4 L-5 R-5 L-6 R-6 L-7 R-7 L-8 R-8

L-1

Figure 20 Data Processing Upon Parity Error Occurrence

PROCESSING DURING ERROR RECOVERY

PLL becomes locked and data demodulation begins when preambles B, M and W are detected.

RDATA output data is output from the RLRCK edge after RERR goes Low.

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