peb2255 Infineon Technologies Corporation, peb2255 Datasheet - Page 288

• Manufacturer Part Number: peb2255
• Description: E1/t1/j1 Framer And Line Interface Component For Long And Short Haul Applications
• Manufacturer: Infineon Technologies Corporation

Transmit Pulse-Mask 2…0 (Read/Write)
Value after RESET: 9C
The transmit pulse shape which is defined in ANSI T1. 102 is output on pins XL1 and
XL2. The level of the pulse shape can be programmed via registers XPM2...0 to create
a custom waveform. In order to get an optimized pulse shape for the external
transformers each pulse shape is divided internally 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:
Changing the LSB of each subpulse in registers XPM2...0 changes the amplitude of the
differential voltage on XL1/2 by approximately 110 mV.
The XPM-values in the following table are based on simulations. They are valid for the
following external circuitry: transformer ratio: 1:
resistors: 5
conditions.
Table 54
Range in
m
0...40
40...81
81...122
122...162
162...200
Data Sheet
XPM0
XPM1
XPM2
XP12
XP30
XLHP
7
Range in
ft.
0...133
133...266
266...399
399...533
533...655
. Adjustment of these coefficients may be necessary for other external
Pulse Shaper Programming (T1/J1)
XP04-00: First pulse shape level
XP14-10: Second pulse shape level
XP24-20: Third pulse shape level
XP34-30: Fourth pulse shape level
XP11
XP24
XLT
H
, 03
XPM0
DAXLT
7D
5B
7F
5F
19
XP10
XP23
H
, 00
hexadecimal
H
XPM1
XP04
XP22
AB
BB
9B
9F
B7
288
XPM2
XP03
XP21
XP34
01
01
01
01
01
2
; cable: PULB 22AWG (100 ); serial
XP04-
XP00
XP02
XP20
XP33
25
27
29
31
31
XP14-
XP10
XP01
XP14
XP32
24
26
27
27
26
decimal
FALC-LH V1.3
T1/J1 Registers
XP24-
XP20
XP00
XP13
XP31
0
10
13
14
6
7
PEB 2255
XP34-
XP30
2000-07
(24)
(25)
(26)
3
3
3
3
3