peb2256 Infineon Technologies Corporation, peb2256 Datasheet - Page 81

• Manufacturer Part Number: peb2256
• Description: E1/t1/j1 Framer And Line Interface Component For Long And Short Haul Applications
• Manufacturer: Infineon Technologies Corporation

Table 17
Enabled by
–
XSP.TT0
TSWM.TSIF
TSWM.TSIS
TSWM.TRA
TSWM.TSA(8:4)
1)
2)
3)
4.2.2.2
Synchronization status is reported by bit FRS0.LFA. Framing errors are counted by the
Framing Error Counter (FEC). Asynchronous state is reached after detecting 3 or 4
consecutive incorrect FAS words or 3 or 4 consecutive incorrect service words (bit 2 = 0
in time slot 0 of every other frame not containing the frame alignment word), the selection
is done by bit RC0.ASY4. Additionally, the service word condition can be disabled. When
the framer lost its synchronization an interrupt status bit ISR2.LFA is generated.
In asynchronous state, counting of framing errors and detection of remote alarm is
stopped. AIS is automatically sent to the backplane interface (can be disabled by bit
FMR2.DAIS).
Further on the updating of the registers RSW, RSP, RSA(8:4), RSA6S and RS(16:1) is
halted (remote alarm indication, S
The resynchronization procedure starts automatically after reaching the asynchronous
state. Additionally, it can be invoked user controlled by bit FMR0.FRS (force
resynchronization, the FAS word detection is interrupted until the framer is in the
asynchronous state. After that, resynchronization starts automatically).
Synchronous state is established after detecting:
• a correct FAS word in frame n,
• the presence of the correct service word (bit 2 = 1) in frame n + 1,
• a correct FAS word in frame n + 2.
If the service word in frame n + 1 or the FAS word in frame n + 2 or both are not found
searching for the next FAS word starts in frame n + 2 just after the previous frame
alignment signal.
Data Sheet
pin XDI or XSIG or XFIFO buffer (signaling controller)
Additionally, automatic transmission of the A-bit is selectable.
As a special extension for double frame format, the S
Synchronization Procedure
Transmit Transparent Mode (Doubleframe E1)
Framing
(int. gen.)
via pin XDI
(int. gen.)
(int. gen.)
(int. gen.)
(int. gen.)
Transmit Transparent Source for
1)
a
A-Bit
XSW.XRA
via pin XDI
XSW.XRA
XSW.XRA
via pin XDI
XSW.XRA
/S
i
-Bit access).
81
a
2)
-bit register can be used optionally.
S
XSW.XY0…4
3)
via pin XDI
XSW.XY0…4
XSW.XY0…4
XSW.XY0…4
via pin XDI
a
-Bits
Functional Description E1
S
XSW.XSIS, XSP.XSIF
via pin XDI
via pin XDI
via pin XDI
XSW.XSIS, XSP.XSIF
XSW.XSIS, XSP.XSIF
i
-Bits
FALC56 V1.2
PEB 2256
2002-08-27