SAA7806H NXP [NXP Semiconductors], SAA7806H Datasheet - Page 37
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SAA7806H
Manufacturer Part Number
SAA7806H
Description
One chip automotive CD audio device
Manufacturer
NXP [NXP Semiconductors]
Datasheet
1.SAA7806H.pdf
(73 pages)
- Current page: 37 of 73
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Philips Semiconductors
9397 750 13697
Objective data sheet
6.6.6.5 Error corrector statistics
6.6.7 Audio back-end and data output interfaces
CFLG:
information is serial, similar to that used on the MEAS pin.
The serial format consists of a pause bit followed by a start bit. This start bit is followed by
the data bits. The format of the data is explained in
periods and the frame length is 11 bits.
Table 10:
[1]
[2]
[3]
[4]
BLER counters:
frames (C1 / C2) with at least one error (for C2, erasures coming from C1 will also be
counted). It doesn’t matter whether the frame was correctable or not.
These registers are reset on read, and the user is responsible for reading them in regular
intervals. The BLER counters can be read on C1Bler and C2Bler.
The channel decoder back-end is shown in
Bit no
0
1 to 3
4
5
9 and 6 to 8
10
The repetition rate on the CFLG signal is not fixed. May be longer or shorter depending on disc speed and
output interface speed. There is always at least one pause bit.
CORMODE definition:
‘000’: C1 correction
‘011’: C2 correction
‘100’: corrector not active
Others: not used
CORFAIL and FLAGFAIL indicate failure status on previous codeword
ERRORCOUNT indicates the number of errors found in the Chien search.
The error corrector outputs status information on the CFLG pin. The format of this
Format description of CFLG serial bus
Value
1
CORMODE[2:0]
FLAGFAIL
CORFAIL
ERRORCOUNT[3:0]
0
There is also a set of two BLER counters which count the number of
Rev. 01 — 20 June 2005
Meaning
start bit
type of correction
failure flag set because correction at risk
failure flag set because correction impossible
number of errors corrected
pause bit
Figure
One chip automotive CD audio device
21.
Table
10. The bit length is 7 sysclk
© Koninklijke Philips Electronics N.V. 2005. All rights reserved.
SAA7806
Note
[1]
[2]
[3]
[3]
[4]
[1]
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