PEB3265 Infineon Technologies Corporation, PEB3265 Datasheet - Page 251

• Manufacturer Part Number: PEB3265
• Description: (PEB326x / PEB426x) Dual Channel Slicofi-2 / Slic Duslic
• Manufacturer: Infineon Technologies Corporation

Preliminary
Bit
LEC-ADAPT
LEC-FREEZE Line Echo Canceller Adaptation Freeze
UTDX-SUM
Data Sheet
4A
H
CIS/LEC-
MODE
ADAPT
LEC-
7
Line Echo Canceller Adaptation Start. The LEC-ADAPT bit is only
evaluated if the LEC-EN is changed from 0 to 1.
To initialize the LEC coefficients to 0 requires the LEC-ADAPT bit set
to 0 followed by the LEC-EN bit changed from 0 to 1.
It is not possible to reset the LEC coefficients to 0 while the LEC is
running. The LEC has to be disabled first by setting bit LEC-EN to 0 and
then it is necessary to enable the LEC again (LEC-EN = 1, LEC-ADAPT
= 0). If valid coefficients from a former LEC adaptation are present in
the RAM, it is possible to activate the LEC with this coefficents by
setting bit LEC-ADAPT to 1.
It is also possible to read out adapted coefficients from the LEC for
external storage and to reuse these coefficients as a start up value for
the next connection (see the available Apllication Notes).
LEC-ADAPT = 0
LEC-ADAPT = 1
LEC-FREEZE = 0 No freezing of coefficients
LEC-FREEZE = 1 Freezing of coefficients
Sum signal for Universal Tone Detection unit in transmit direction
UTDX-SUM = 0
UTDX-SUM = 1
FREEZE
LEC-
CIS/LEC Mode Setting
6
UTDX-
SUM
5
SLICOFI-2x Command Structure and Programming
Line Echo Canceller coefficients initialized with
zero
Line Echo Canceller coefficients initialized with old
coefficients
The transmit signal is fed through
if LEC is enabled) is fed through
(see bit UTDX-SRC in BCR2 and
The sum signal S
UTDR-
SUM
4
251
3
0
SUM
(receive signal + LEC signal,
2
0
DuSLIC-E/-E2/-P
FRM
CIS-
Figure
1
2000-07-14
32)
CIS-
V23
0
Y