peb2255 Infineon Technologies Corporation, peb2255 Datasheet - Page 197

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

Framer Mode Register 2 (Read/Write)
Value after RESET: 00
RFS1... 0...
RTM…
DAIS…
SAIS…
PLB…
Data Sheet
FMR2
RFS1
7
00… Doubleframe format
01… Doubleframe format
10… CRC4 Multiframe format
11… CRC4 Multiframe format with modified CRC4 Multiframe
Setting this bit disconnects control of the internal elastic store from the
receiver. The elastic store is now in a “free running” mode without any
possibility to update the time slot assignment to a new frame position
in case of re-synchronization of the receiver. This function can be
used in conjunction with the “disable AIS to system interface” feature
(FMR2.DAIS) to realize undisturbed transparent reception.
This bit should be enabled in case of unframed data reception mode.
After resetting RTM to 0, the elastic buffer is adjusted after the next
resynchronization.
0…
1…
Sends AIS via output RDO towards system interface. This function is
not influenced by bit FMR2.DAIS.
Payload Loopback
0…
1...
Receive Framing Select
Receive Transparent Mode
Disable AIS to System Interface
Send AIS Towards System Interface
RFS0
H
alignment algorithm (Interworking according to ITU-T G.706
Annex B). Setting of FMR3.EXTIW changes the reaction after
the 400 ms timeout.
AIS is automatically inserted into the data stream to RDO if
FALC
Automatic AIS insertion is disabled. Furthermore, AIS insertion
can be initiated by programming bit FMR2.SAIS.
Normal operation. Payload loop is disabled.
The payload loopback loops the data stream from the receiver
section back to transmitter section. Looped data is output on
pin RDO. Data received on port XDI, XSIG, SYPX and XMFS is
RTM
®
-LH is in asynchronous state.
DAIS
197
SAIS
PLB
AXRA
FALC-LH V1.3
ALMF
E1 Registers
0
PEB 2255
2000-07
(1C)