SDA6000 Datasheet, PDF (351/380 Pages) Infineon Technologies AG – Teletext Decoder with Embedded 16-bit Controller

SDA 6000
Slicer and Acquisition
ACQLP2
15 14 13 12
FC1 MLENGTH(2..0)
ER
11 10
ALENGTH
(1..0)
987
CLKDIV(2..0)
Reset Value: XXXX_H
6 5 432 1 0
NORM(2..0)
FCSEL(1..0) VCR 0
Bit
FC1ER
MLENGTH
(2 … 0)
ALENGTH
(1 … 0)
Function
Error tolerance of FC1 check
0: No error allowed
1: One error allowed
For noise suppression reasons a median filter has been introduced after
the actual data separation because of oversampling successive samples
could be averaged. Therefore an odd number of sliced successive
samples is taken and if the majority are ‘1’ a ‘1’ is sliced otherwise a ‘0’.
MLENGTH specifies how many samples are taken.
MLENGTH
Number of samples
000
1
001
3
010
5
011
7
100
9
101
11
110
13
111
15
If noise has been detected or if NOISEON = 1, the output of the slicing
level filter is further averaged by means of an accumulation (arithmetic
averaging). ALENGTH specifies the number of slicing level filter output
values used for averaging. The accumulation clock depends on CLKDIV.
ALENGTH
00
01
10
11
Number of Slicing Level Output Values
used for Averaging
2
4
8
16
Users Manual
12 - 20
2000-06-15