TCM8002_08 Datasheet, PDF (18/25 Pages) Texas Instruments – DATA PROCESSOR FOR CELLULAR TELEPHONE

TCM8002
DATA PROCESSOR FOR CELLULAR TELEPHONE
SLWS008C − SEPTEMBER 1994 − REVISED JUNE 1996
PRINCIPLES OF OPERATION
address 48 − TCM8010 interface word 0
Table 11. Interface Word 0
BIT
FUNCTION
7 Value = 0 for TCM8010 read operation, 1 for write operation
6 −4 TCM8010 address
3 −0 TCM8010 write data bits D9 −D6
Writing to the TCM8010 interface word 0 initiates a TCM8010 interaction. The result of any read operation (i.e.,
an ADC conversion result) can be accessed by a subsequent read from the TCM8010 result location.
address 49 − TCM8010 interface word 1
These are the TCM8010 data bits D5 to D0.
address 4D − counter/timer coefficient
Writing to address 4D sets the count length and starts a down count from the value written.
address 50 − SAT coef
This coefficient controls the SAT detector digital phase-locked loop time constant.
address 51 − DATAREC coef 1
This controls the data-recovery circuit acquisition performance before bit synchronization is achieved.
address 52 − DATAREC coef 2
This controls the data-recovery circuit lock performance after bit synchronization is achieved.
address 53 − control word 4
Table 12. Control Word 4
BIT
FUNCTION (WHEN BIT IS SET)
0 Low-power mode select
1 Clock selection (with control word 2)
With low-power mode selected, the BCH decoder circuit is turned on only when there is data to be
error-corrected. The SAT detector and regenerator can be turned off when not required (control word 1).
address 57 − mismatch
This relates to the number of successive frames that are not recognized during data recovery before bit
synchronization is searched again.
address 59 − FOCC dotting
This is a coefficient for the data-recovery circuit and is related to how much of the dotting preamble of the forward
control channel data is required before it is accepted that bit synchronization has been achieved.
address 5A − FVC dotting
This is a coefficient for the data-recovery circuit and is related to how much of the dotting preamble of the forward
voice channel data is required before it is accepted that bit synchronization has been achieved.
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