PEB24911HV13 Lantiq, PEB24911HV13 Datasheet - Page 48

• Manufacturer Part Number: PEB24911HV13
• Manufacturer: Lantiq

Specifications of PEB24911HV13

• Lead Free Status / Rohs Status: Supplier Unconfirmed

EOC (M1-M3) Filtering
The first three M-bits (M1-M3) in each basic U-frame constitute an EOC command/
message. For the different EOC commands and their meaning see the next paragraph.
Via register MFILT the following operating modes can be set:
• Automode (MFILT.EOC= ’100’)
• Transparent mode (MFILT.EOC= ’001’)
• Transparent mode with On Change function active (MFILT.EOC= ’010’)
• Transparent mode with TLL active (MFILT.EOC= ’011’)
For more details on EOC commands and messages and its processing please refer to
chapter 3.9 on page 46.
Overhead Bit (M4, M5, M6) Filtering
M4 bits are used to communicate status and maintenance functions between the
transceivers. The meaning of a bit position depends on the direction of transmission
(upstream/downstream) and the operation mode (NT/LT). See
meaning of the M4 bits.
To reflect a change of the system status a new value for M4 bits shall be repeated in at
least three consecutively transmitted superframes. All overhead bits are set to binary ’1’
when leaving a power-down state.
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 the
corresponding MON-2 message is issued. The following filter algorithms are provided:
• On Change (MFILT.M4= ’X00’)
• Triple-Last-Look (TLL) coverage (MFILT.M4= ’X01’)
• CRC coverage (MFILT.M4= ’X10’)
• CRC and TLL coverage (MFILT.M4= ’X11’)
Some M4 bits, ACT, DEA and UOA, have two destinations, the state machine and the
system interface. Via bit no. 5 of the MFILT register the user can decide whether the M4
bits which are input to the state machine shall be approved
• by TLL (MFILT.M4= ’0XX’) or
Data Sheet
In automode received EOC messages are checked by ’triple-last-look’ (TLL) before
they are signalled to the system by a MON-0 message. The Return Message
Reception Function is activated (see
In transparent mode received EOC messages are forwarded via MON-0 to the system
interface. This means that every 6 ms a MON-0 message is issued.
Only if a change in the EOC message has been detected the received EOC message
is reported via a MON-0 message.
A change is only reported via MON-0 if the new EOC command has been detected in
at least three consecutive EOC messages.
“EOC Auto Mode” on Page
38
Functional Description
Table 6
47).
for the different
PEF 24911
2001-07-16