TDA9874A Philips Semiconductors, TDA9874A Datasheet - Page 54

• Manufacturer Part Number: TDA9874A
• Description: Digital TV sound demodulator/decoder
• Manufacturer: Philips Semiconductors

Philips Semiconductors
Table 78 Description of the NISR bits; notes 1 and 2
Notes
1. The TDA9874A does not support the extended control modes. Therefore, the program of the first sound carrier
2. When a NICAM transmitter is switched off, the device will lose synchronization. In that case the program of the first
10.4.3
Bits B7 to B0 contain the number of errors occurring in the previous 128 ms period. The register is updated every
128 ms.
Table 79 NICAM error count register (subaddress 2)
10.4.4
The contents of these two registers provide information on the additional data bits. AD byte 0 is stored at subaddress 3.
Table 80 Data register 1 (subaddress 3)
Table 81 Description of the DR1 bits
Table 82 Data register 2 (subaddress 4)
1999 Dec 03
Digital TV sound demodulator/decoder
(i.e. FM mono or AM) is selected for reproduction in case bit C3 is set HIGH, independent of bit AMUTE in the NICAM
configuration register being set or not.
sound carrier is selected for reproduction, independent of bit AMUTE being set or not.
7 to 0
OVW
AD7
BIT
BIT
B7
7
6
5
4
3
2
1
0
7
7
7
NICAM E
D
ATA
R
AD7 to AD0
EGISTERS
SYMBOL
SYMBOL
RROR
S/MB
D/SB
OSB
CFC
AD6
SAD
C4
C3
C2
C1
B6
6
6
6
C
(DR1
OUNT
NICAM application control bits: these bits correspond to the control bits C1 to C4 in
the NICAM transmission.
Synchronization bit: when OSB = 1, it indicates that the device has both frame and C0
(16 frame) synchronization. When OSB = 0, it indicates that the audio output from the
NICAM part is digital silence.
Configuration change: when CFC = 1, it indicates a configuration change at the
16 frame (C0) boundary
Identification of NICAM stereo: when S/MB = 1, it indicates stereo mode
Identification of NICAM dual mono: when D/SB = 1, it indicates dual mono mode.
The lower 8 bits of the additional data word.
R
AND
EGISTER
AD5
B5
DR2)
5
5
5
(NIECR)
AD4
CI1
B4
4
4
4
54
AD3
CI2
B3
3
3
3
DESCRIPTION
DESCRIPTION
AD10
AD2
B2
2
2
2
Preliminary specification
AD1
AD9
B1
1
1
1
TDA9874A
AD0
AD8
B0
0
0
0