PEF82912FV14XP Lantiq, PEF82912FV14XP Datasheet - Page 95

• Manufacturer Part Number: PEF82912FV14XP
• Manufacturer: Lantiq

Specifications of PEF82912FV14XP

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

2.4.7
The U-transceiver provides internal counters for far-end and near-end block errors. This
allows a comfortable surveillance of the transmission quality at the U-interface. In
addition, the occurrence of near-end errors, far-end errors, and the simultaneous
occurrence of both errors are reported to the µC by an interrupt at the beginning of the
following receive-superframe.
A block error is detected each time when the calculated checksum (CRC) of the received
data does not correspond to the control checksum transmitted in the successive
superframe. One block error thus indicates that one U-superframe has not been
transmitted correctly. No conclusion with respect to the number of bit errors is therefore
possible.
2.4.7.1
A near-end block error (NEBE) indicates that the error has been detected in the receive
direction (i.e. NEBE in the NT = LT => NT error). Each detected NEBE-error increments
the 8-bit NEBE-counter. When reaching the maximum count, counting is stopped and
the counter value reads (FF
A far-end block error identifies errors in transmission direction (i.e. FEBE in the NT = NT
=> LT-error). FEBE errors are processed in the same manner as NEBE-errors.
The FEBE and NEBE counter values can be read in registers FEBE and NEBE. The
counter is cleared after read. The counters are also reset to 00
states listed in
2.4.7.2
Figure 45
Transmission errors are simulated with artificially corrupted CRCs. With two commands
the cyclic redundancy checksum can be inverted in the upstream and downstream
direction. A third command offers to invert single FEBE-bits.
• EOC Command NCC:
– EOC auto mode:
– EOC transparent mode
Data Sheet
Requests the Q-SMINT I to notify corrupted CRCs.
The functional behavior of the Q-SMINT I and the NEBE-counter depends on the
mode selected:
NEBE-detection stopped: no NEBE interrupt generated and NEBE-counter disabled
NEBE-detection enabled: NEBE interrupt generated and NEBE-counter enabled
Block Error Counters
Near-End and Far-End Block Error Counter
Testing Block Error Counters
illustrates how near- and far-end block error counters can be tested.
Table
15.
H
).
81
Functional Description
H
in all states except the
PEF 82912/82913
2001-03-30