PEF82912FV14XP Lantiq, PEF82912FV14XP Datasheet - Page 89

• Manufacturer Part Number: PEF82912FV14XP
• Manufacturer: Lantiq

Specifications of PEF82912FV14XP

• Number Of Line Interfaces: 1
• Control Interface: HDLC
• Lead Free Status / Rohs Status: Supplier Unconfirmed

2.4.4
2.4.4.1
Four different validation modes can be selected and take effect on a per bit base. Only
if the received M4 bit change has been approved by the programmed filter algorithm a
report to the µC is triggered. The following filter algorithms are provided and can be
programmed in the MFILT register:
• On Change
• Triple-Last-Look (TLL) coverage
• CRC coverage
Note that unlike the M4 bits the M56 bits are not included in the CRC generation!
• CRC and TLL coverage
2.4.4.2
Some M4 bits, ACT, DEA and UOA, have two destinations, the state machine and the
µC. Regarding these bits Triple-Last-Look (TLL) is applied by default before the changed
status is input to the state machine. Via the MFILT register the user can decide whether
the M4 bits which are input to the state machine shall be approved
• by TLL (default setting, since TLL is a Bellcore requirement) or
• by the same verification mode as selected for reporting to the µC.
The reset values before activation are ACT=0, DEA=1, UOA=0.
2.4.4.3
By default changes in the received spare bits M51, M52, and M61 are reported to the µC
only if no CRC violation has been detected. However the user has the choice to program
one of the following two options in the MFILT register (for details see
• Same validation algorithm is applied to M5 and M6 bits as programmed for M4 bits
• On Change
In transmit direction these bits are set by default to ’1’ if they are not explicitly set by an
µC access (via M56W register).
2.4.4.4
Figure 40
several maintenance channel bits.
Data Sheet
summarizes again the various filtering options that are provided for the
Processing of the Overhead Bits M4, M5, M6
M4 Bit Reporting to the µC
M4 Bit Reporting to State Machine
M5, M6 Bit Reporting to the µC
Summary of M4, M5, M6 Bit Reporting
75
Functional Description
PEF 82912/82913
Chapter
2001-03-30
4.11.2):