pef2256e Infineon Technologies Corporation, pef2256e Datasheet - Page 85

• Manufacturer Part Number: pef2256e
• Description: E1/t1/j1 Framer And Line Interface Component For Long- And Short-haul Applications
• Manufacturer: Infineon Technologies Corporation

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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.
Reaching the synchronous state causes a frame alignment recovery interrupt status
ISR2.FAR if enabled. Undisturbed operation starts with the beginning of the next
doubleframe.
4.2.2.3
If the FALC
interrupt status bit ISR2.RA is set. With setting of bit XSW.XRA a remote alarm (RAI) is
sent to the far end.
By setting FMR2.AXRA the FALC
the outgoing data stream if the receiver detects a loss of frame alignment FRS0.LFA = 1.
If the receiver is in synchronous state FRS0.LFA = 0 the remote alarm bit is reset.
Note: The A-bit can be processed by the system interface. Setting bit TSWM.TRA
4.2.2.4
As an extension for access to the S
is implemented to allow the usage of internal S
doubleframe format.
This function is enabled by setting FMR1.ENSA = 1 for the transmitter and
FMR1.RFS(1:0) = 01 for the receiver. In this case the FALC
16-frame structure but no CRC multiframe alignment/generation is performed.
User’s Manual
Hardware Description
The presence of the correct service word (bit 2 = 1) in frame n + 1,
A correct FAS word in frame n + 2.
enables transparency for the A-bit in transmit direction (refer to
A-Bit Access
S
®
a
56 detects a remote alarm indication in the received data stream the
-Bit Access
®
56 automatically transmit the remote alarm bit = 1 in
a
-bits through registers RSA(8:4)/XSA(8:4) an option
85
a
-bit registers RSA(8:4)/XSA(8:4) in
Functional Description E1
®
56 internally works with a
Table
DS1.1, 2003-10-23
PEF 2256 H/E
17).
FALC
®
56