peb20954 Infineon Technologies Corporation, peb20954 Datasheet - Page 28

• Manufacturer Part Number: peb20954
• Description: Smart Integrated Digital Echo Canceller Sidec
• Manufacturer: Infineon Technologies Corporation

Preliminary Data Sheet
If this modus is chosen by setting CONFLAW.CHIND=’0’ all 32 PCM channels are
converted according to the settings of GALAWFE for the far end and GALAWNE for the
near end. A ‘1’ in GALAWFE and GALAWNE indicates that A-Law is used for the
corresponding end. A ‘0’ indicates usage of -Law. The conversion can be disabled
channel individually by setting the CHCTRL0-31.CONVDIS = ‘1’ via software. Law
decoding/encoding is then carried out according to GCONVDISLAW. To activate the
serial control signal and the UCC interface as disabling source for the PCM law
conversion the bits CHCTRL0-31.ENPCTRL must be set to ‘0’.
Channel individual A- to - and - to A-Law conversion:
For channel individual conversion the user can configure independently for each channel
whether A- to -, - to A- or no Law conversion is selected via setting IALAWNE for the
near end and IALAWFE for the far end with the corresponding value for A- or -Law. The
conversion can be disabled channel individually by setting the CHCTRL0-31.CONVDIS
= ‘1’ via software. Law decoding/encoding is then carried out according to CHCTRL0-
31.CONVDISLAW. To activate the serial control signal and the UCC interface as
disabling source for the PCM law conversion the bits CHCTRL0-31.ENPCTRL must be
set to ‘0’.
Figure 8
CONFLAW.CHIND
channel individual
configuration via
configuration via
CONFLAW[2:0]
CHCTRL[7:5]
global
1
0
CHCTRL0-31.CONVDIS
CHCTRL0-31.CONVDIS
Explanation of Options for A- and -Law Conversion
possible
conversion
possible
conversion
1
0
1
0
disable
conversion
CHCTRL0-31.ENPCTRL
disable
conversion
CHCTRL0-31.ENPCTRL
possible
conversion
possible
conversion
1
0
1
0
enable
conversion
enable
conversion
28
UCC or Ser.Control
UCC or Ser.Control
1
0
1
0
disable
conversion
enable
conversion
disable
conversion
enable
conversion
Functional Description
CHCTRL0-31.ILAWFE/ILAWNE
CHCTRL0-31.ICONVDISLAW
GLAWFE/GLAWNE
GCONVDISLAW
PEB 20954
PEF 20954
1
0
1
0
1
0
1
0
04.99
A-law
-law