PEB22554 SIEMENS [Siemens Semiconductor Group], PEB22554 Datasheet - Page 317

• Manufacturer Part Number: PEB22554
• Description: ICs for Communications
• Manufacturer: SIEMENS [Siemens Semiconductor Group]

XPRBS…
LDC1…0...
LAC1…0...
FLLB…
LLBP…
Semiconductor Group
Transmit Pseudo Random Bit Sequence
A one in this bit position enables transmitting of a pseudo random bit
sequence to the remote end. Depending on pit LLBP the PRBS is
generated according to 2
Length Deactuate (Down) Code
These bits defines the length of the LLB deactuate code which is
programmable in register LCR2.
00… length: 5 bit
01… length: 6 bit, 2 bit, 3 bit
10… length : 7 bit
11… length : 8 bit, 2 bit, 4bit
Length Actuate (Up) Code
These bits defines the length of the LLB actuate code which is
programmable in register LCR3.
00… length: 5 bit
01… length: 6 bit, 2 bit, 3 bit
10… length : 7 bit
11… length : 8 bit, 2 bit, 4bit
Framed Line Loopback / Invert PRBS
Depending on bit LCR1.XPRBS this bit enables different functions:
LCR1.XPRBS=0:
0…
1…
Invert PRBS
LCR1.XPRBS=1:
0…
1…
Line Loopback Pattern
LCR1.XPRBS=0
0…
1…
The line loopback code is transmitted including framing bits.
LLB code overwrites the FS/DL bits.
The line loopback code is transmitted unframed. LLB code will
not overwrite the FS/DL bits.
The generated PRBS is transmitted not inverted.
The PRBS is transmitted inverted.
Fixed line loopback code according to ANSI T1. 403 .
Enable user programmable line loopback code via register
LCR2/3.
317
15
-1 or 2
20
Operational Description T1 / J1
-1 ( ITU-T O. 151).
PEB 22554
09.98