MSP 3400C
PRELIMINARY DATA SHEET
Table 6–8: Channel modes ‘MODE_REG [7–9]‘
FM1 FM2
bit[7]
AM
bit[8]
HDEV
bit[9]
channel 1
channel 2
0
1
X
X
0
0
1
X
0
0
0
1
mute
FM-Mono (FM1)
FM2
FM1
AM
AM
FM-Mono (high deviation)
FM-Mono (high deviation)
6.2.3. FIR-Filter Switches
Table 6–9: Loading sequence for FIR-coefficients
To simplify programming of the MSP 3400C, two addi-
tional switches have been implemented.
WRITE_ADR = FIR_REG_1(Channel 1: FM2)
No.
1
Symbol Name
FM2_Coeff. (5)
FM2_Coeff. (4)
Bits
8
Value
The FIR filter for channel1/FM2 can use either
FIR_REG_1 coefficients or FIR_REG_2 coefficients by
meansofMODE_REG[13]. Herewith, itisnolongernec-
essary to transmit both coefficient sets in FM-terrestrial
mode. The loading sequence for FIR_REG_2 is suffi-
cient.
see Table 6–10.
2
8
3
4
5
6
FM2_Coeff. (3)
FM2_Coeff. (2)
FM2_Coeff. (1)
FM2_Coeff. (0)
8
8
8
8
The additional gain of +6 dB in channel1/FM2 can be
switched to 0 dB by means of MODE_REG[12]. Togeth-
er with MODE_REG[13] set to 1, in satellite mode, it is
no longer necessary to transmit both FIR filtercoefficient
sets. The loading sequence for FIR_REG_2 is sufficient.
WRITE_ADR = FIR_REG_2 (Channel 2: FM1/FM
mono)
6.2.4. FIR-Parameter
No.
1
Symbol Name
Bits
8
Value
The following data values (see Table 6–9) are to be
transferred 8 bits at a time embedded LSB-bound in
a 16 bit word. These sequences must be obeyed. To
* IMREG1 (8 LSBS)
04 HEX
40 HEX
2
* IMREG1 / IMREG2
(4 MSBs / 4 LSBs)
8
change
a
coefficient set, the complete block
FIR_REG_1 or FIR_REG_2 must be transmitted. The
new coefficient set will be active without a load_reg rou-
tine.
3
4
5
* IMREG2 (8 MSBs)
FM_Coef (5)
8
8
8
00 HEX
see Table 6–10.
FM_Coef (4)
6
7
8
9
FM_Coef (3)
FM_Coef (2)
FM_Coef (1)
FM_Coef (0)
8
8
8
8
*
IMREG_1/2: Two 12-bit off-set constants
24
MICRONAS INTERMETALL
MICRONAS [ MICRONAS ]
