PEB22554 SIEMENS [Siemens Semiconductor Group], PEB22554 Datasheet - Page 133

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

Semiconductor Group
XPRBS…
LDC1…0...
LAC1…0...
FLLB…
1…
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, 4 bit
Framed Line Loopback / Invert PRBS
Depending on bit LCR1.XPRBS this bit enables different functions:
LCR1.XPRBS=0:
0…
1…
PRBS is enabled. Setting this bit enables incrementing the
CEC2 error counter with each detected PRBS bit error. With
any change of state of the PRBS internal synchronization
status an interrupt ISR1.LLBSC is generated. The current
status of the PRBS synchronizer is indicated by bit
RSP.LLBAD.
The line loopback code is transmitted including framing bits.
The line loopback code is transmitted unframed.
133
15
-1 or 2
20
-1 ( ITU-T O. 151).
Operational Description E1
PEB 22554
09.98