pef2256e Infineon Technologies Corporation, pef2256e Datasheet - Page 242

• Manufacturer Part Number: pef2256e
• 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
FMR2
RFS(1:0)
RTM
DAIS
SAIS
PLB
User’s Manual
Hardware Description
RFS1
7
Receive Framing Select
00 = Doubleframe format
01 = Doubleframe format
10 = CRC4 Multiframe format
11 = CRC4 Multiframe format with modified CRC4 Multiframe
Receive Transparent Mode
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 actualize the time slot assignment to a new frame
position in case of resynchronization of the receiver. This function can
be used together 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.
Disable AIS to System Interface
0 =
1 =
Send AIS Towards System Interface
Sends AIS on output RDO towards system interface. This function is
not influenced by bit FMR2.DAIS.
Payload Loop-Back
0 =
1 =
RFS0
H
can be initiated by programming bit FMR2.SAIS.
Normal operation. Payload loop is disabled.
The payload loop-back 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
ignored. With XSP.TT0 = 1 time slot 0 is also looped back. If
alignment algorithm (Interworking according to ITU-T G.706
Annex B). Setting of FMR3.EXTIW changes the reaction after
the 400-ms time-out.
AIS is automatically inserted into the data stream to RDO if
FALC
Automatic AIS insertion is disabled. Furthermore, AIS insertion
XSP.TT0 = 0 time slot 0 is generated internally. AIS is sent
RTM
®
56 is in asynchronous state.
DAIS
242
SAIS
PLB
AXRA
DS1.1, 2003-10-23
PEF 2256 H/E
ALMF
E1 Registers
0
FALC
(1E)
®
56