MSP4458 datasheet(77/85 Pages) MICRONAS

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PRELIMINARY DATA SHEET

MSP 44x8G

Micronas

6.3.4. DCO-Registers

Note: The use of this register is not recommended. It

should be used only in cases where non-standard car-

rier frequencies have to be processed. Please note,

that the usage of user specific demodulation frequen-

cies is not possible in combination with the Automatic

Sound Select (MODUS[0]=1).

When selecting a TV-sound standard by means of the

STANDARD SELECT register, all frequency tuning is

performed automatically.

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 MSP. In Table 6–9, examples for DCO register

programming are listed. It is necessary to separate

these registers into two categories: low part and high

part. The formula for the calculation of the INCR val-

ues for any chosen IF frequency is as follows:

INCRdec = int (f / fs ⋅ 2

24)

with: int = integer function

= IF frequency in MHz

fS = sampling frequency (18.432 MHz)

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 and _LO for MSP-Ch1, DCO2_HI

and _LO for MSP-Ch2).

6.4. Manual Mode:

Description of Demodulator Read Registers

Note: This register should be used only in cases

where software compatibility to the MSP 44x0D is

required. Using the STANDARD SELECTION register

together with the STATUS register provides a more

economic way to program the MSP 44x8G and to

retrieve information from the MSP.

All registers except C_AD_BITs are 8 bits wide. They

can be read out of the RAM of the MSP 44x8G.

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.

Table 6–9: DCO registers for the MSP 44x8G; reset status: DCO_HI/LO = “00 00”

DCO1_LO 00 93hex, DCO1_HI 00 9Bhex; DCO2_LO 00 A3hex, DCO2_HI 00 ABhex

IF-Freq. [MHz]

DCO_HI [hex]

DCO_LO [hex]

IF-Freq. [MHz]

DCO_HI [hex]

DCO_LO [hex]

4.5

03E8

0000

5.04

5.5

5.58

5.7421875

04 60

04 C6

04 D8

04 FC

00 00

03 8E

00 00

00 AA

5.76

5.85

5.94

05 00

05 14

05 28

00 00

6.0

6.2

6.5

6.552

05 35

05 61

05 A4

05 B0

05 55

0C 71

07 1C

00 00

6.6

6.65

6.8

05 BA

05 C5

05 E7

0A AA

0C 71

01 C7

7.02

06 18

00 00

7.2

06 40

00 00

7.38

06 68

00 00

7.56

06 90

00 00

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