DATA SHEET
MSP 34x0G
6.4. Manual/Compatibility Mode:
Table 6–16: NICAM operation modes as defined by
Description of Demodulator Read Registers
the EBU NICAM 728 specification
C4 C3 C2 C1 Operation Mode
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
register together with the STATUS register pro-
vides a more economic way to program the
MSP 34x0G and to retrieve information from the
IC.
0
0
0
0
0
0
0
0
1
0
1
0
Stereo sound (NICAMA/B),
independent mono sound (FM1)
Two independent mono signals
(NICAMA, FM1)
Three independent mono channels
(NICAMA, NICAMB, FM1)
0
1
0
0
1
0
1
0
Data transmission only; no audio
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.
Stereo sound (NICAMA/B), FM1
carries same channel
1
1
0
0
0
1
1
0
One mono signal (NICAMA). FM1
carries same channel as NICAMA
All transmissions take place in 16-bit words. The valid
8-bit data are the 8 LSBs of the received data word.
Two independent mono channels
(NICAMA, NICAMB). FM1 carries
same channel as NICAMA
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.
1
x
0
1
1
x
1
x
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
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.
6.4.1. NICAM Mode Control/Additional Data Bits
Register
6.4.2. Additional Data Bits Register
NICAM operation mode control bits and A[2:0] of the
additional data bits.
Contains the remaining 8 of the 11 additional data bits.
The additional data bits are not yet defined by the
NICAM 728 system.
Format:
MSB
C_AD_BITS 00 23hex
LSB
Format:
11
...
...
7
6
5
4
3
2
1
0
MSB
7
ADD_BITS 00 38hex
LSB
0
Auto
_FM
A[2] A[1] A[0]
C4
C3
C2
C1
S
6
5
4
3
2
1
A[10]
A[9]
A[8]
A[7]
A[6]
A[5]
A[4]
A[3]
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.
6.4.3. CIB Bits Register
CIB bits 1 and 2 (see NICAM 728 specifications).
Format:
MSB
CIB_BITS 00 3Ehex
LSB
0
The operation mode is coded by C4-C1 as shown in
Table 6–16.
7
x
6
x
5
x
4
x
3
x
2
x
1
CIB1
CIB2
Micronas
May 27, 2003; 6251-476-1DS
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