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PEB2256HT Datasheet(PDF) 241 Page - Infineon Technologies AG

Part # PEB2256HT
Description  E1/T1/J1 Framer and Line Interface Component for Long and Short Haul Applications
PDF  490 Pages
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Manufacturer  INFINEON [Infineon Technologies AG]
Direct Link  http://www.infineon.com
Logo INFINEON - Infineon Technologies AG

PEB2256HT Datasheet(HTML) 241 Page - Infineon Technologies AG

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FALC56 V1.2
PEB 2256
E1 Registers
Data Sheet
241
2002-08-27
Transmit Pulse Mask (Read/Write)
Value after reset: 7B
H, 03H, 40H
The transmit pulse shape which is defined in ITU-T G.703 is output on pins XL1 and XL2.
The level of the pulse shape can be programmed by registers XPM(2:0) to create a
custom waveform. In order to get an optimized pulse shape for the external transformers
each pulse shape is internally divided into four sub pulse shapes. In each sub pulse
shape a programmed 5 bit value defines the level of the analog voltage on pins XL1/2.
Together four 5 bit values have to be programmed to form one complete transmit pulse
shape. The four 5 bit values are sent in the following sequence:
XP04 to 00:
First pulse shape level
XP14 to 10:
Second pulse shape level
XP24 to 20:
Third pulse shape level
XP34 to 30:
Fourth pulse shape level
Changing the LSB of each subpulse in registers XPM(2:0) changes the amplitude of the
differential voltage on XL1/2 by approximately 80 mV.
Example:120
Ω interface and wired as shown in Figure 50 on page 155.
XP04 to 00:
1BH or 27 decimal
XP14 to 10:
1BH or 27 decimal
XP24 to 20:
00H
XP34 to 30:
00H
Programming values for XPM(2:0): 00
H, 03H,7BH
XLT
Transmit Line Tristate
0 =
Normal operation
1 =
Transmit line XL1/XL2 or XDOP/XDON are switched into high-
impedance state. If this bit is set the transmit line monitor status
information is frozen (default value after hardware reset).
70
XPM0
XP12
XP11
XP10
XP04
XP03
XP02
XP01
XP00
(26)
XPM1
XP30
XP24
XP23
XP22
XP21
XP20
XP14
XP13
(27)
XPM2
0
XLT
DAXLT
XP34
XP33
XP32
XP31
(28)



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