MSP3421G MICRONAS [Micronas], MSP3421G Datasheet - Page 95

• Manufacturer Part Number: MSP3421G
• Description: Multistandard Sound Processor Family with Virtual Dolby Surround
• Manufacturer: MICRONAS [Micronas]

PRELIMINARY DATA SHEET
6.4. Manual/Compatibility Mode:
Note: The use of these register is no longer recom-
mended. It should be used only in cases where soft-
ware compatibility to the MSP 34x0D is required.
Using the STANDARD SELECTION register together
with the STATUS register provides a more economic
way to program the MSP 34x1G and to retrieve infor-
mation from the IC.
All registers except C_AD_BITs are 8 bits wide. They
can be read out of the RAM of the MSP 34x1G if the
MSP 34x0D 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 3411/3451G
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.
Micronas
Auto
_FM
11
MSB
Description of Demodulator Read Registers
Register
...
...
A[2]
7
C_AD_BITS 00 23
A[1]
6
A[0]
5
C4
4
hex
C3
3
C2
2
C1
1
LSB
S
0
Table 6–16: NICAM operation modes as defined by
the EBU NICAM 728 specification
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:
A[10]
C4
0
0
0
0
1
1
1
1
x
AUTO_FM: monitor bit for the AUTO_FM Status:
0: NICAM source is NICAM
1: NICAM source is FM
MSB
MSB
7
7
x
C3
0
0
0
0
0
0
0
0
1
A[9]
6
6
x
C2
0
0
1
1
0
0
1
1
x
A[8]
5
5
x
C1
0
1
0
1
0
1
0
1
x
ADD_BITS 00 38
CIB_BITS 00 3E
A[7]
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)
4
4
x
A[6]
3
3
x
MSP 34x1G
hex
hex
A[5]
2
2
x
CIB1
A[4]
1
1
CIB2
LSB
LSB
A[3]
0
0
95