MSP3450G datasheet(97/106 Pages) MICRONAS

97 / 106 page

DATA SHEET

MSP 34x0G

Micronas

May 27, 2003; 6251-476-1DS

6.4. Manual/Compatibility Mode:

Description of Demodulator Read Registers

Note: The use of these register is no longer recom-

mended. It should be used only in cases where

software compatibility to the MSP 34x0D is

required. Using the STANDARD SELECTION

vides a more economic way to program the

MSP 34x0G and to retrieve information from the

IC.

All registers except C_AD_BITs are 8 bits wide. They

can be read out of the RAM of the MSP 34x0G if the

MSP 34x0D Manual/Compatibility Mode is required.

All transmissions take place in 16-bit words. The valid

8-bit data are the 8 LSBs of the received data word.

If the Automatic Sound Select feature is not used, the

NICAM or FM-identification parameters must be read

and evaluated by the controller in order to enable

appropriate switching of the channel select matrix of

the baseband processing part. The FM-identification

registers are described in section 6.6.1. To handle the

NICAM-sound and to observe the NICAM-quality, at

least the registers C_AD_BITS and ERROR_RATE

must be read and evaluated by the controller. Addi-

tional data bits and CIB bits, if supplied by the NICAM

transmitter, can be obtained by reading the registers

ADD_BITS and CIB_BITS.

6.4.1. NICAM Mode Control/Additional Data Bits

NICAM operation mode control bits and A[2:0] of the

additional data bits.

Format:

Important: “S” = Bit[0] indicates correct NICAM-syn-

chronization (S = 1). If S = 0, the MSP 3410/3450G

has not yet synchronized correctly to frame and

sequence, or has lost synchronization. The remaining

read registers are therefore not valid. The MSP mutes

the NICAM output automatically and tries to synchro-

nize again as long as MODE_REG[6] is set.

The operation mode is coded by C4-C1 as shown in

Table 6–16.

Note: It is no longer necessary to read out and evalu-

ate the C_AD_BITS. All evaluation is performed in the

MSP and indicated in the STATUS register.

6.4.2. Additional Data Bits Register

Contains the remaining 8 of the 11 additional data bits.

The additional data bits are not yet defined by the

NICAM 728 system.

Format:

6.4.3. CIB Bits Register

CIB bits 1 and 2 (see NICAM 728 specifications).

Format:

MSB

C_AD_BITS 00 23hex

LSB

...

76543

210

Auto

_FM

...

A[2]

A[1]

A[0]

Table 6–16: NICAM operation modes as defined by

the EBU NICAM 728 specification

Operation Mode

Stereo sound (NICAMA/B),

independent mono sound (FM1)

Two independent mono signals

(NICAMA, FM1)

Three independent mono channels

(NICAMA, NICAMB, FM1)

Data transmission only; no audio

Stereo sound (NICAMA/B), FM1

carries same channel

One mono signal (NICAMA). FM1

carries same channel as NICAMA

Two independent mono channels

(NICAMA, NICAMB). FM1 carries

same channel as NICAMA

Data transmission only; no audio

Unimplemented sound coding

option (not yet defined by EBU

NICAM 728 specification)

AUTO_FM: monitor bit for the AUTO_FM Status:

0: NICAM source is NICAM

1: NICAM source is FM

MSB

ADD_BITS 00 38hex

LSB

765

43210

A[10]

A[9]

A[8]

A[7]

A[6]

A[5]

A[4]

A[3]

MSB

CIB_BITS 00 3Ehex

LSB

76543210

xxxxxx

CIB1

CIB2

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