pef80913 Infineon Technologies Corporation, pef80913 Datasheet - Page 78

• Manufacturer Part Number: pef80913
• Description: 2b1q Second Gen. Modular Isdn Nt
• Manufacturer: Infineon Technologies Corporation

2.4.2
The last three symbols (6 bits) of each basic frame are used as M (Maintenance)-
channel for the exchange of operation and maintenance data between the network and
the NT. Approved M-bit data is first processed and then reported to the µC by interrupt
requests. The verification method is programmed in the MFILT register (see
Chapter
EOC-data is inserted into the U-frame at the positions M1, M2 and M3
thereby permitting the transmission of two complete EOC-messages (2× 12 bits) within
one U-superframe (see
M4 bits are used to communicate status and maintenance functions between the
transceivers. The meaning of a bit position is dependent upon the direction of
transmission (upstream/downstream) and the operation mode (NT/LT). See
the different meaning of the M4 bits. For details see
The M5 and M6 bits contain the FEBE bit and the CRC bits. For details see
Chapter
2.4.2.1
The maintenance channel information is exchanged with external devices via the
appropriate registers. Received maintenance channel information is reported to the µC
by an interrupt.
2.4.2.2
The maintenance data to be transmitted can be programmed by writing the internal
EOCW/M4W/M56W registers.
2.4.2.3
Transmission of the Maintenance channel data is only possible if a superframe is
transmitted and the M-bits are transparent (M-Bits are “normal” in
states all maintenance bits are clamped to high.
Reception of the Maintenance channel data is enabled by the state machine in the
following states:
Table 15
Data Sheet
Synchronized1
Synchronized2
Wait for ACT
Transparent
Error S/T
4.11.2).
2.4.6.
Maintenance Channel
Reporting to the µC Interface
Access from the µC Interface
Availability of Maintenance Channel Information
Enabling the Maintenance Channel (Receive Direction)
Chapter
2.4.3).
64
Chapter
2.4.4.
Functional Description
PEF 82912/82913
Table
24). In other
Table 14
(Table
2001-03-30
14)
for