PRELIMINARY DATA SHEET
MSP 34x2G
Table 6–13: Loading sequence for FIR-coefficients
The loading sequences must be obeyed. To change a
coefficient set, the complete block FIR1 or FIR2 must
be transmitted.
FIR1 00 01hex (MSP-Ch1: NICAM/FM2)
Note: For compatibility with MSP 3410B, IMREG1 and
IMREG2 have to be transmitted. The value for
IMREG1 and IMREG2 is 004. Due to the partitioning to
8-bit units, the values 04hex, 40hex, and 00hex arise.
No.
1
Symbol Name
Bits
8
Value
NICAM/FM2_Coeff. (5)
NICAM/FM2_Coeff. (4)
NICAM/FM2_Coeff. (3)
NICAM/FM2_Coeff. (2)
NICAM/FM2_Coeff. (1)
NICAM/FM2_Coeff. (0)
2
8
3
8
6.3.7. DCO-Registers
see Table 6–14
4
8
Note: The use of this 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 MODUS register provides a more economic
way to program the MSP 34x2G.
5
8
6
8
FIR2 00 05hex (MSP-Ch2: FM1/AM)
No.
1
Symbol Name
IMREG1
Bits
8
Value
04hex
40hex
00hex
When selecting a TV-sound standard by means of the
STANDARD SELECT register, all frequency tuning is
performed automatically.
2
IMREG1/IMREG2
IMREG2
8
If manual setting of the tuning frequency is required, a
set of 24-bit registers determining the mixing frequen-
cies of the quadrature mixers can be written manually
into the IC. In Table 6–15, some examples of DCO reg-
isters are listed. It is necessary to divide them up into
low part and high part. The formula for the calculation
of the registers for any chosen IF frequency is as fol-
lows:
3
8
4
FM/AM_Coef (5)
FM/AM_Coef (4)
FM/AM_Coef (3)
FM/AM_Coef (2)
FM/AM_Coef (1)
FM/AM_Coef (0)
8
5
8
6
8
see Table 6–14
7
8
8
8
INCRdec = int(f/fs 224)
9
8
with: int = integer function
f
= IF frequency in MHz
fS = sampling frequency (18.432 MHz)
6.3.6. FIR-Parameter, Registers FIR1 and FIR2
Conversion of INCR into hex-format and separation of
the 12-bit low and high parts lead to the required regis-
ter values (DCO1_HI or _LO for MSP-Ch1, DCO2_HI
or LO for MSP-Ch2).
Note: The use of this 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 MODUS register provides a more economic
way to program the MSP 34x2G.
Data-shaping and/or FM/AM bandwidth limitation is
performed by a pair of linear phase Finite Impulse
Response filters (FIR-filter). The filter coefficients are
programmable and are either configured automatically
by the STANDARD SELECT register or written manu-
ally by the control processor via the control bus. Two
not necessarily different sets of coefficients are
required: one for MSP-Ch1 (NICAM or FM2) and one
for MSP-Ch2 (FM1 = FM-mono). In Table 6–14 several
coefficient sets are proposed.
To load the FIR-filters, the following data values are to
be transferred
8
bits at
a
time embedded
LSB-bound in a 16-bit word.
Micronas
93
MICRONAS [ MICRONAS ]
