PEB20571 INFINEON [Infineon Technologies AG], PEB20571 Datasheet - Page 95
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PEB20571
Manufacturer Part Number
PEB20571
Description
ICs for Communications
Manufacturer
INFINEON [Infineon Technologies AG]
Datasheet
1.PEB20571.pdf
(291 pages)
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4.2.7
Data processing and frame handling in the TRANSIU is fully DSP controlled. Serial data
received and transmitted on the IOM-2000 Interface is arranged in the Shift Receive
RAM and Shift Transmit RAM.
The DSP processed bytes are stored in the TRANSIU Current Buffer. Every 8 kHz frame
the TRANSIU and DSP Current Buffers are switched.
4.2.7.1
The data is received and transmitted at a nominal bit rate of 384 kbit/s. In the first half of
the 4 kHz U
the frame ‘zeros’ are transmitted and data is received.
Scrambling and de-scrambling of the B-channel data is done automatically. The received
and transmitted data is stored in the Data RAM in the following format:
U
In transmit direction, depending on the multiframe position, the M-bit contains either the
T-bit or the S-bit with the following functionality:
• T-bit: a) D-channel available info to the terminal
• S-bit: switches remote loop in terminal device
4.2.7.2
B-channel data on all U
continuous power density spectrum on the line.
Scrambling is done according to ITU-T V.27 with the generator polynomial 1 + x
Initialization via History RAM (HRAM)
The scrambler is activated/de-activated for each U
to the history RAM address.
Preliminary Data Sheet
PN
Mode Receive / Transmit Data Format
b) DECT synchronization signal
7
D-channel
IOM-2000 Data Interface
U
U
PN
PN
PN
frame data is transmitted and ‘zeros’ are received, in the second half of
Scrambler/Descrambler
Mode
6
PN
Operation Mode Command/Status bits
channels of the IOM-2000 interface is scrambled to give a flat
M-bit
5
B1-channel data
B2-channel data
4
x
4-11
3
x
PN
channel separately by a DSP write
2
x
Functional Description
1
x
PEB 20571
0
x
DELIC
6
2003-08
+ x
7
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