MSP3410D datasheet(31/83 Pages) MICRONAS

31 / 83 page

PRELIMINARY DATA SHEET

MSP 34x0D

Micronas

6.6. Demodulator Read Registers:

Functions and Values

All registers except C_AD_BITS are 8 bits wide. They

can be read out of the RAM of the MSP 34x0D.

All transmissions take place in 16-bit words. The valid

8 bit data are the 8 LSBs of the received data word.

To enable appropriate switching of the channel select

matrix of the baseband processing part, the NICAM or

FM identification parameters must be read and evalu-

ated by the CCU. The FM identification registers are

described in section 7.2. on page 39. 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 CCU. Additional

data bits and CIB bits, if supplied by the NICAM trans-

mitter, can be obtained by reading the registers

ADD_BITS and CIB_BITS.

Observing the presence and quality of NICAM can be

delegated to the MSP 3410D, if the automatic switch-

ing feature (AUTO_FM, section 6.6.1. on page 32) is

applied.

Table 6–13: Result of Autodetection

Result of Autodetect

007Ehex

Code

(Data) hex

Detected TV Sound Standard

Note: After detection, the detected standard is set automatically according to Table 6–3.

>07FF

autodetect still active

0000

no TV sound standard was detected; select sound standard manually

0002

M Dual FM, even if only FM1 is available

0003

B/G Dual FM, even if only FM1 is available

0008

B/G FM NICAM, only if NICAM is available

0009

L_AM NICAM, whenever a 6.5-MHz carrier is detected, even if NICAM is not available.

If also D/K might be possible, a decision has to be made according to the video mode:

Video = SECAM_L

→ no more activities

necessary

Video = SECAM_EAST

CAD_BITS[0] = 0

CAD_BITS[0] = 1

To be set by means of the

short programming mode:

D/K1 or D/K2

(see section 6.6.1.)

D/K-NICAM

(standard 00Bhex)

000A

I-FM-NICAM, even if NICAM is not available

Note: Similar as for the Demodulator Short-Programming, the Autodetection does not affect most of the para-

meters of the DSP section (Audio Baseband Processing): The following exceptions are to be considered:

− identification mode: Autodetection resets and sets the corresponding identification mode

− Prescale FM/AM and FM matrix and Deemphasis FM are undefined after Autodetection

MSP3410D Datasheet(PDF) 31 Page - Micronas

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