TDA9874H datasheet(33/56 Pages) PHILIPS

33 / 56 page

1998 Apr 27

Philips Semiconductors

Preliminary speciﬁcation

Digital TV sound demodulator/decoder

TDA9874H

7.3.19

I2SOUTPUT SELECT REGISTER (I2SOSR)

This register is used to define both the signal source to be output at the I2S port and the mode of the digital matrix for

signal selection.

The two combinations of FM and NICAM shown in Table 53 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. Note

that the controlling microprocessor has to assure that the FM dematrix is set to the mono position.

The default setting at power-up is 00000000.

Table 50 I2S Output Select Register (subaddress 22)

Table 51 Description of I2SOSR bits

Table 52 Mode of the digital matrix for signal selection

Table 53 Signal source left and right

76543210

−

ICSM2

ICSM1

ICSM0

−−

ISS1

ISS0

BIT

SYMBOL

DESCRIPTION

−

This bit is not used and should be set to logic 0.

ICSM2

Output channel selection mode. These 3 bits select the output channel selection

mode; see Table 52.

ICSM1

ICSM0

−

These 2 bits are not used and should be set to logic 0.

−

ISS1

Signal source. These 2 bits select the signal source; see Table 53.

ISS0

ICSM2

ICSM1

ICSM0

L OUTPUT

R OUTPUT

L input

R input

L input

R input

L input

100

ISS1

ISS0

SIGNAL SOURCE

LEFT

RIGHT

FM left

FM right

NICAM left

NICAM right

FM mono

NICAM M1

FM mono

NICAM M2

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