TDA9874A Philips Semiconductors, TDA9874A Datasheet - Page 46

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

Philips Semiconductors
10.3.20 I
This register is used to define both the signal source to be output at the I
for signal selection.
The two combinations of FM and NICAM shown in Table 62 apply to the (rare) condition that three different languages
are being broadcast in an FM + NICAM system. They allow for a two-out-of-three selection for special applications.
It should be noted that the controlling microprocessor has to assure that the FM dematrix is set to the mono position or
IDSWFM is set HIGH. If the I
dematrix switching (see subaddress 11).
The default setting after power-on reset is ‘0000 0000’.
Table 60 I
Table 61 Description of the I
1999 Dec 03
Digital TV sound demodulator/decoder
TVSMIIS
BIT
7
7
6
5
4
3
2
1
0
2
S-
2
S-bus output select register (subaddress 22)
BUS
O
SYMBOL
TVSMIIS
ICSM2
ICSM2
ICSM1
ICSM0
UTPUT
ISS1
ISS0
6
S
ELECT
2
2
SOSR bits
S-bus signal source is set to FM left or FM right it is influenced by the automatic FM
Auto-select function: for TV applications, only in combination with IDSWFM set HIGH.
If set HIGH switches the matrix automatically depending on the IDSTE, IDDUA bits for
FM and the S/MB, D/SB bits for NICAM in transmitters subaddresses 0 and 1
(see Sections 10.4.1 and 10.4.2).
Output channel selection mode: these 3 bits select the output channel selection
mode; see Table 62
these 2 bits are not used and should be set to logic 0
Signal source: these 2 bits select the signal source; see Table 62
R
ICSM1
EGISTER
5
(I
2
SOSR)
ICSM0
4
46
3
0
DESCRIPTION
2
S-bus port and the mode of the digital matrix
2
0
ISS1
Preliminary specification
1
TDA9874A
ISS0
0