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MSP3440G 参数 Datasheet PDF下载

MSP3440G图片预览
型号: MSP3440G
PDF下载: 下载PDF文件 查看货源
内容描述: 多标准音频处理器系列 [Multistandard Sound Processor Family]
分类和应用:
文件页数/大小: 106 页 / 1906 K
品牌: MICRONAS [ MICRONAS ]
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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  
97  
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