MSP3410B datasheet(22/68 Pages) MICRONAS

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PRELIMINARY DATA SHEET

MSP 3410 B

ITT Semiconductors

11.3. Read Registers: Listing and Addresses

The following 8-bit parameters can be read out of the

RAM of the MSP 3410 B; functionally they all belong to

the NICAM decoding process; their addresses are listed

in Table 11–9.

All transmissions take place in 16 bit words. The valid 8

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

To enable correct switching to NICAM sound, at least the

CCU. Additional data bits and CIB bits, if supplied by the

NICAM transmitter, as well as information about the sig-

nal quality can be obtained by reading the remaining

registers.

Table 11–9: Addresses of read registers

Read Registers

HEX

C_AD_BITS

0023

FAWCT_IST

0025

ADD_BITS

0038

CIB_BITS

003E

CONC_CT

0058

11.4. Read Registers: Functions and Values

C_AD_BITS: NICAM operation mode control bits and

A[0–2] of the additional data bits.

Format:

MSB

C_AD_BITS 0023hex

LSB

A[2]

A[1]

A[0]

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

chronization (S=1). If S = 0, no correct frame or se-

quence synchronization have been found yet and the

read registers are not valid.

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

Table 11–10.

ADD_BITS: Contains the remaining 8 of the 11 addition-

al data bits. The additional data bits are yet not defined

by the NICAM 728 system.

Format:

MSB

ADD_BITS 0038hex

LSB

A[10]

A[9]

A[8]

A[7]

A[6]

A[5]

A[4]

A[3]

CIB_BITS: cib bits 1 and 2 (see NICAM 728 specifica-

tions)

Format:

MSB

CIB_BITS 003Ehex

LSB

CIB1

CIB2

FAWCT_IST: The contents of this register give informa-

tion on the actual position of the FAW-counter. For opti-

mum NICAM performance, the value should be identical

with or little below the value of ’FAW_SOLL’. If it reaches

0 the FP-software mutes and stops the NICAM-decod-

ing automatically by searching for FAW synchronization

once more.

CONC_CT: This register contains the actual number of

bit errors of the previous 728 bit data frame. It may hap-

pen that in spite of acceptable FAWCT_IST the bit error

rate result is too high for appropriate sound perform-

ance. In this case the CCU can switch to the analog FM-

sound assumed to have the same program (Control bit

C4).

Table 11–10: NICAM operation modes as defined by

the EBU NICAM 728 specification

Operation Mode

Stereo sound (NICAMA/B), indepen-

dent mono sound (FM1)

Two independent mono signals (NI-

CAMA, FM1)

Three independent mono channels

(NICAMA, NICAMB, FM1)

Data transmission only; no audio

Stereo sound (NICAMA/B), FM1 car-

ries 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)

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