TDA9874H datasheet(40/56 Pages) PHILIPS

40 / 56 page

1998 Apr 27

Philips Semiconductors

Preliminary speciﬁcation

Digital TV sound demodulator/decoder

TDA9874H

7.4.5

LEVEL READ-OUT REGISTERS (LRRA AND LRRB)

These two bytes constitute a word that provides data from

a location that has been specified with the FM Monitor

Select Register (see Section 7.3.3). The most significant

byte of the data is stored at subaddress 5.

Table 68 Level Read-out Register A (subaddress 5)

Note

1. B7 is the most significant bit or sign bit of the word.

Table 69 Level Read-out Register B (subaddress 6)

Note

1. B0 is the least significant bit of the word.

7.4.6

SIF LEVEL REGISTER (SIFLR)

When the SIF AGC is on, bits B4 to B0 of this register

contain a number that gives an indication of the SIF input

level. That number can be interpreted in the same way as

the AGC Gain Register setting (see Section 7.3.1), i.e. if

the SIF AGC were set to a fixed gain and the same number

loaded into the AGC Gain Register, the current SIF input

signal level would generate an SIF ADC output close to

full-scale.

When the SIF AGC is off, this register returns the contents

of the AGC Gain Register.

Bits B5 to B7 are not used and are undeﬁned.

Table 70 SIF Level Register (subaddress 7)

Note

1. Value is undefined.

7.4.7

TEST REGISTER 2 (TR2)

This register contains as a binary number the highest

subaddress used for slave receiver registers.

The first version will have the identification 00101111.

76543210

B7(1)

76543210

B0(1)

76543210

−(1)

Table 71 Test Register 2 (subaddress 252)

7.4.8

TEST REGISTER 1 (TR1)

This register contains as a binary number the highest

subaddress used for slave transmitter (status) registers.

The first version will have the identification 00101111.

Table 72 Test Register 1 (subaddress 253)

7.4.9

DEVICE IDENTIFICATION CODE (DIC)

There will be several devices in the digital TV sound

processor family, with TDA9874H being the second

member. This byte is used to identify the individual family

members.

The first version will have the identification 00000111.

Table 73 Device Identiﬁcation Code (subaddress 254)

7.4.10

SOFTWARE IDENTIFICATION CODE (SIC)

It is likely that during the life time of this family of devices

several versions of the DSP software will be made, e.g. to

take care of new application concepts, respond to

customer wishes, etc. This byte is used to identify the

different releases.

The first version will have the identification 00000111.

Table 74 Software Identiﬁcation Code (subaddress 255)

76543210

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