MSP3410B Datasheet, PDF (23/68 Pages) Micronas – Multistandard Sound Processor

PRELIMINARY DATA SHEET
MSP 3410 B
11.5. Sequences to Transmit Parameters and to
Start Processing
After having been switched on, the MSP has to be initial-
ized by transmitting the parameters according to the
LOAD_SEQ_1/2 of Table 11–11. To make the data ac-
tive, the load routine LOAD_REG_1/2 must be acti-
vated.
For NICAM operation the following steps listed in ‘NI-
CAM_START, _READ and _Check’ in Table 11–11 must
be taken.
For FM-stereo operation the evaluation of the identifica-
tion signal must be performed. For positive identification
check, the MSP 3410 B sound channels have to be
switched corresponding to the detected operation
mode.
Table 11–11: Sequences to initialize and start the MSP 3410 B
LOAD_SEQ_1/2: General Initialization, followed by LOAD_REG_1/2
Write into MSP 3410 B:
0. AD_CV
1. Audio_PLL
2. FAWCT_SOLL
3. FAW_ER_TOL
4. FIR_REG_1
5. FIR_REG_2
6. MODE_REG
7. DCO1_LO
8. DCO1_HI
9. DCO2_LO
10. DCO2_HI
11. start LOAD_REG_1/2 process;
FM-processing starts
(only for NICAM mode)
(only for NICAM mode)
In the case
“NICAM only” operation, the
steps 9. and 10. can be
skipped
Note: To ensure software
compatibility to the MSP3400 B,
before any modification of a
demodulator parameter con-
cerning an active output channel,
this channel should be muted
NICAM_START: Start of the NICAM Software
Write into MSP 3410 B:
1. Start SEARCH_NICAM Process
2. Wait at least 0.5 s
NICAM_READ: Read NICAM specific information
Read out of MSP 3410 B:
1. FAWCT_IST
2. C_AD_BITS
3. CONC_CT
NICAM_CHECK: CCU checks for presence, operation mode and quality of NICAM signal
1. Evaluation of all three parameters in the CCU (see section 11.4.)
2. If necessary, switch the corresponding sound channels within the audio processing part
FM_IDENT_CHECK: Decoding of the identification signal
1. Evaluation of the stereo detection register (DFP register 0018_hex, high part)
2. If necessary, switch the corresponding sound channels within the audio processing part
LOAD_SEQ_1: Reinitialization of Channel 1 without affecting Channel 2, followed by LOAD_REG_1
Write into MSP 3410 B:
1. FIR_REG_1
2. MODE_REG
3. DCO1_LO
4. DCO1_HI
5. start LOAD_REG_1 process
(6 ⋅ 8 bit)
(12 bit)
(12 bit)
PAUSE: Duration of “Pause” determines the repetition rate of the NICAM or the FM_IDENT-check
AUDIO PROCESSING INIT: Initialization of Audio Processing Part, which may be customer dependant (see section 12.)
ITT Semiconductors
23